General

Stopwatch Calculator - Calculate Time Durations & Laps

A precise stopwatch calculator to find the time duration between a start and end time, or to add and subtract multiple time durations (laps).

Cooking Calculator — Scale Recipes, Convert Units, Estimate Roast Times

Cooking calculator for professionals and home cooks: scale recipes precisely, convert mass and volume by ingredient density, and estimate roast times with doneness and oven settings.

Carb Calculator - Calculate Your Daily Carbohydrate Needs

Calculate your optimal daily carbohydrate intake based on your age, sex, activity level, and goals. Get carb targets for weight loss, maintenance, or muscle gain.

RGB Converter - Convert RGB to Hex, HSL & CMYK

Instantly convert RGB color values to Hex, HSL, and CMYK formats. This accessible, mobile-first tool includes a color picker, conversion formulas, and expert FAQs.

Elapsed Time Calculator

Calculate the exact duration and time difference between two dates and times. Find the total days, hours, and minutes that have passed.

Home Equity Loan Calculator — Max Borrow, LTV/CLTV, Payment & Schedule

Compute your available home equity, maximum borrowable amount under an LTV cap, CLTV, and monthly payment for a fixed home equity loan or HELOC (interest-only). Includes schedule, formulas, methodology, and FAQs.

Capital Gains Tax Calculator

Compute capital gains tax with country presets (US, UK, Australia, Ireland, South Africa) or custom rules. Includes basis, exemptions, losses, and holding period.

Blood Pressure Calculator - Check Your Reading

Assess your blood pressure reading with this easy-to-use calculator. Instantly see your category (Normal, Elevated, Stage 1, Stage 2) based on 2017 AHA guidelines.

Adhesive Calculator - Estimate Tile Mortar Needs

Accurately calculate the number of tile adhesive (thin-set mortar) bags needed for your project. Input area, trowel size, and waste factor for instant estimates.

Factor of Safety Calculator | Mechanical Engineering Tool

Professional factor of safety (FoS) calculator for mechanical engineers. Compute FoS, margin of safety, and allowable stress from material strength and applied stress. WCAG 2.1 AA accessible, mobile-first, and optimized for Core Web Vitals.

Download Time Calculator — Precise & Accessible

Estimate download time precisely: model line speed, protocol overhead, server per-connection caps, and parallel streams. Accessible, mobile-first, and methodology-backed.

Angstroms to Nanometers (Å to nm) Converter

Instantly convert Angstroms (Å) to nanometers (nm) and vice versa. Includes an advanced wavelength converter for nm, Å, µm, and eV with spectrum analysis.

Bandwidth Calculator — Estimate Internet Speed Needs & File Transfer Time

Professional bandwidth calculator: estimate household or office internet speed needs by activities and users, plus compute file transfer time with protocol overhead and efficiency. Includes formulas, glossary, and FAQs.

Debt to Income Ratio (DTI) Calculator - CalcDomain

Calculate your front-end and back-end debt-to-income (DTI) ratio to understand your borrowing power for a mortgage, auto, or personal loan. See what lenders see.

Compression Ratio Calculator - Engine CR Tool

Calculate your engine

Surface Area Calculator – cube, box, sphere, cylinder, cone & more

Free surface area calculator for 3D shapes. Get the surface area of cubes, rectangular prisms (boxes), spheres, cylinders (with or without top), cones, pyramids and triangular prisms. Includes formulas, unit support and examples.

Matrix Calculator (Addition, Multiplication, Inverse, etc.) | CalcDomain

A powerful free matrix calculator that supports addition, subtraction, multiplication, determinant, inverse, transpose, and more. Handle matrices up to 10x10.

Earned Income Tax Credit (EITC) Calculator

Estimate your federal Earned Income Tax Credit (EITC) for tax years 2023 and 2024. Mobile-first, WCAG 2.1 AA accessible, and based on IRS-published parameters.

Added Sugar Calculator | Nutrition Tool for Daily Sugar Limits

Professional-grade added sugar calculator. Estimate your daily added sugar limit from calories or body metrics (Mifflin–St Jeor). Compare your intake, see teaspoons, and align with WHO and USDA guidelines.

conic classifier

Classify a general second-degree equation Ax² + Bxy + Cy² + Dx + Ey + F = 0 as ellipse, circle, parabola, hyperbola, or degenerate. Compute rotation angle, center, canonical form, and axes.

Countdown Calculator - Calculate Time Remaining

Calculate the time remaining until a specific date and time, or start a countdown timer for a set duration. See the breakdown in years, months, days, hours, minutes, and seconds.

Business Loan Calculator - Calculate Payments & Amortization

Calculate your business loan payment, total interest, and full amortization schedule. Enter loan amount, APR, and term to get instant, accurate results.

Project Layout & Design – Flooring Calculator

Plan floor layouts and material takeoffs with an accessible, high‑precision flooring calculator. Compute area, tile/plank counts, waste, boxes, trims, and layout guidance.

Blog & Resources - Financial Education & Calculator Guides | CalcDomain

Free financial education resources, calculator guides, and expert insights on mortgages, retirement planning, taxes, and personal finance.

Discount Calculator - Calculate Final Price & Savings

Easily calculate the final price and your total savings after a percentage discount. Enter the original price and discount percentage to get instant, accurate results.

Business Days Calculator - Calculate Workdays

Calculate business days between two dates or find a future/past date by adding or subtracting workdays. Accounts for weekends and public holidays.

Insulation Calculator - Estimate Material & Cost

Estimate the number of insulation bags/rolls (batt, blown-in) and total cost for your project. Enter area and R-value to get an instant calculation.

Break Even Calculator - Find Your Break-Even Point

Calculate your break-even point. Find the units to sell or revenue needed to cover fixed and variable costs. A free, accessible tool for business owners.

Co-Signer Loan Calculator - Compare Savings & APR

Calculate the financial benefit of a co-signer. Compare monthly payments, total interest, and see your potential savings with a lower APR.

EAN Validator - Check & Calculate EAN-13/EAN-8 Check Digits

Instantly validate any EAN-13 or EAN-8 barcode. Our tool checks the format, length, and check digit based on the official GS1 algorithm.

Hard Money Loan Calculator – Points, LTV/LTC, Interest-Only Balloon & Profit

Hard money loan calculator with LTV/LTC caps, points, fees, interest-only vs amortizing payments, cash to close, total financing cost, flip profit & ROI, and printable schedule.

Privacy Policy - CalcDomain | Your Data Protection Rights

CalcDomain Privacy Policy. Learn how we protect your data, what information we collect, and your rights under GDPR and privacy laws.

Gas Mileage Calculator - Calculate MPG, L/100km & Trip Cost

Calculate your car

Decagon Calculator — Side, Apothem, Radius, Perimeter & Area

Professional decagon calculator: compute side, apothem (inradius), circumradius, perimeter, and area from any single input. Includes formulas, step-by-step example, glossary, and FAQs.

Contact Us - CalcDomain | Get in Touch with Our Team

Contact the CalcDomain team. Report issues, suggest calculators, ask questions, or provide feedback. We respond to all inquiries within 48 hours.

Floor Plan Calculator - Calculate Total Project Area

Calculate the total area of a floor plan by adding multiple rooms and complex shapes (rectangles, L-shapes). Get accurate square footage/meters for flooring, painting, or DIY projects.

15 vs 30 Year Mortgage — Payment, Interest & Total Cost Comparison | CalcDomain

Compare monthly payments, total interest, and total cost between a 15-year and a 30-year fixed-rate mortgage. Enter loan amount, rates, and taxes/insurance to see which term fits your budget.

Email Validator - Check Email Address Syntax & Format

Instantly check if an email address is formatted correctly with our free Email Validator. Validates syntax against RFC 5322 standards. 100% client-side and private.

Cylinder Calculator — Volume & Surface Area

Professional cylinder calculator for engineers and students: compute volume, lateral area, total surface, base area, circumference, and mass (with density). Supports multiple units and shows formulas in LaTeX.

CalcDomain - Free Online Calculators for Every Need

Access 1700+ free online calculators at CalcDomain. From financial planning to health metrics, math conversions to construction projects - find the perfect calculator for any calculation.

Car Lease Calculator – Payment, Money Factor, Residual & Total Cost

Pro car lease calculator: enter MSRP, cap cost, money factor or APR, residual %, fees and taxes to get monthly payment (pre/post tax), due at signing, rent charge, depreciation, and cost-per-mile with an exportable month-by-month breakdown.

Calorie Deficit Calculator — Maintenance, Safe Deficit & Time to Goal

Estimate your TDEE, choose a safe calorie deficit, and see how long it may take to reach a target weight. Uses the Mifflin–St Jeor equation with transparent methodology.

Geometric Sequence Calculator – Terms, nth Term & Sum of Series

Geometric sequence calculator: compute terms, nth term and partial sums. Solve for the first term, ratio, index or nth term, and check convergence of geometric series with clear formulas and step-by-step logic.

CIDR Calculator - Calculate Subnet, Range & IP Details

Instantly calculate IP address range, subnet mask, wildcard mask, network address, and broadcast address from any IP/CIDR notation. A complete CIDR tool.

DNA to Protein Translator | Unified Genetic Code

Convert DNA (or RNA) sequences into protein using the standard genetic code. Supports frame selection, stop-codon handling, and quick copy for downstream analysis.

Search Calculators - CalcDomain

Search through over 1,700 free online calculators. Find the perfect tool for finance, health, math, construction, and everyday calculations.

GPA Calculator - Calculate Your Semester & Cumulative GPA

Calculate your semester and cumulative GPA with our easy-to-use tool. Add courses, grades, and credits. Supports all standard US 4.0 and 4.3 grading scales.

Cube Calculator - Geometric & Shipping Volume

A 2-in-1 tool to calculate geometric cube properties (volume, surface area, diagonal) from any value, or to calculate shipping volume (CBM) for logistics.

Frequently Asked Questions (FAQ) | CalcDomain

Find answers to common questions about CalcDomain calculators, accuracy, privacy, and how to use our financial tools effectively.

EIN Validator - Instantly Check Your Employer ID Number Format

Our free EIN Validator tool instantly checks if an Employer Identification Number (EIN) has a valid 9-digit format and a recognized IRS prefix.

Engine Horsepower Calculator — Torque × RPM, Wheel vs. Crank HP

Calculate engine horsepower from torque and RPM. Switch units (lb·ft / N·m), estimate drivetrain (wheel vs. crank) losses, and convert between hp and kW. Includes formulas, examples, glossary, and FAQs.

Debt Snowball Calculator — Fastest Path to Debt Freedom

Free debt snowball calculator: enter your debts and see your exact payoff date, monthly schedule, interest saved, and printable plan. Includes snowball, avalanche, and custom order.

Cash Flow Projection Calculator

Project your business

US State Income Tax Calculators | CalcDomain

State-by-state income tax calculators for all 50 states and Washington, DC. Estimate liability, brackets, deductions, credits, and effective rates—fast and transparent.

Diet Plan Calculator - Calculate Your Daily Calorie Needs

Calculate your daily calorie needs for weight loss, maintenance, or gain based on the Mifflin-St Jeor formula. Get a personalized diet plan macro-breakdown.

Hobbies Calculators | CalcDomain

Crafting, photography, gaming, and outdoor hobby calculators. From yarn and sewing yardage to depth of field, epoxy resin, aquarium stocking, darts checkouts, poker odds, and more.

Date Calculator: Find Duration & Add/Subtract Dates

Calculate the duration (years, months, days) between two dates, or find a new date by adding or subtracting time. Accurate, accessible, and mobile-friendly.

Hemocytometer Cell Counting Calculator | Cells per mL

Calculate cell concentration from hemocytometer counts. Enter cells counted, squares, and dilution to get cells/mL, cells/µL, and concentration guidance.

UK & Europe Taxes | CalcDomain Finance

UK PAYE/NI/VAT, UK income tax by region, SDLT & council tax, plus German income, VAT, capital gains, trade & church taxes.

Hash Generator - Create MD5, SHA-1, SHA-256, SHA-512 Hashes

Securely generate cryptographic hashes for any text or string. This online tool supports MD5, SHA-1, SHA-256, SHA-384, and SHA-512 instantly in your browser.

1031 Exchange Calculator — Defer Capital Gains | CalcDomain

Estimate realized gain, taxable boot, deferred gain, and tax deferred in a like-kind 1031 exchange. Enter sale price, basis, costs, debt payoff, and tax rate to get instant results.

Food Scale Calculator - Scale Recipes & Convert Cooking Units

Easily scale recipe ingredients up or down and convert cooking weights (g, oz, lb) and volumes (tsp, tbsp, cup, ml) with this accessible, mobile-first food scale calculator.

Plagiarism Checker

Effortlessly check for plagiarism in your documents with our advanced Plagiarism Checker, designed for students and educators.

CPM Calculator - Calculate Ad Cost, Impressions, or CPM

Calculate CPM (Cost Per Mille), total ad cost, or impressions. This tool helps marketers and advertisers budget campaigns and understand media pricing.

Hex Color Converter - Multi-Format Color Conversion Tool

Instantly convert Hex codes to RGB, HSL, CMYK, HWB, LCH, and OKLCH. A fast, accessible, and comprehensive color tool for designers and developers.

Search Calculators - CalcDomain

Search through over 1,700 free online calculators. Find the perfect tool for finance, health, math, construction, and everyday calculations.

Days Between Dates Calculator - Calculate Duration

Calculate the exact number of days, weeks, months, and years between two dates. Find the duration instantly with our accessible, mobile-first date calculator.

Concrete Water-Cement Ratio Calculator

Professional water-cement ratio calculator for concrete mix design. Compute w/c from water and cement, or find required water or cement for a target ratio. Accessible, mobile-first, and engineered for performance.

Regular Octahedron Volume Calculator

Calculate the volume of a regular octahedron using our precise and accessible tool.

Civil Engineering Calculators | CalcDomain

Civil engineering calculators organized by standard and discipline.

Wall Framing Calculator | Framing & Roofing | CalcDomain

Professional wall framing calculator to estimate studs, plates, blocking, and sheathing. Supports Imperial and Metric, stud spacing, openings, waste factor, and board optimization. WCAG 2.1 AA accessible and mobile-first.

Inflation Calculator (CPI-U) | Finance & Investment

Professional Inflation Calculator based on CPI-U. Adjust amounts for inflation, see cumulative and average annual rates, view CPI references, and copy a shareable link.

Ancient Greek Units Converter – length, mass, and volume

Convert ancient Greek units to modern SI units and between each other: pous (foot), cubit, orgyia, stadion, plethron, talent, mina, drachma, obol, amphora, xestes, medimnos and more. Includes historical notes and approximation warnings.

Inscribed Angle Calculator - Calculate Angle, Arc & Central Angle

Calculate the inscribed angle, intercepted arc, or central angle of a circle based on the Inscribed Angle Theorem. Enter one value to instantly find the others.

Present Value Calculator | Professional, Accessible & SEO-Optimized Tool

Present Value Calculator: compute the PV of a future amount or an annuity. Supports multiple compounding frequencies, inflation adjustment, and annuity timing. WCAG 2.1 AA accessible and mobile-first.

Hyperbola Calculator (Equation, Center, Foci, Asymptotes, Eccentricity)

Free hyperbola calculator. Build the equation of a hyperbola (centered or shifted), and instantly get center, vertices, foci, asymptotes and eccentricity. Supports horizontal and vertical hyperbolas of the form (x−h)²/a² − (y−k)²/b² = 1 or (y−k)²/a² − (x−h)²/b² = 1. Includes formulas and FAQ.

Hexagon Calculator: Area, Perimeter, Apothem, Diagonals & Prism | CalcDomain

Free hexagon calculator for regular hexagons. Enter side, circumradius, apothem, flat-to-flat or area and get all properties: area, perimeter, inradius, circumradius, flat width, point-to-point, and even hexagonal prism volume. Includes formulas and FAQs.

Ponderal Index Calculator

Calculate your Ponderal Index with this easy-to-use tool, designed for health and fitness enthusiasts. Learn more about your body metrics and stay informed.

Nova Scotia Provincial Tax Calculator

An authoritative and accurate Nova Scotia provincial tax calculator for Canadian taxation. Developed by Ugo Candido.

Picometers to Angstroms (pm to Å) Converter

Instantly convert picometers (pm) to angstroms (Å), nanometers (nm), and meters (m). Our 4-way scientific converter is ideal for atomic radii and chemical bonds.

Bayesian Network Builder & Inference Tool

Build a simple Bayesian network in the browser: create nodes, set parent relationships, define conditional probability tables (CPTs), and run exact inference with evidence. Includes explanation of Bayesian networks and formulas.

Hypergeometric Distribution Calculator (PMF, CDF, Mean, Variance)

Interactive hypergeometric distribution calculator. Enter population size N, number of successes K, sample size n, and observed successes k to get P(X=k), cumulative probabilities, mean, variance, and a full table. With formulas and step-by-step explanation.

Buckling Load Calculator (Euler)

Calculate the critical buckling load of columns using Euler

Materials Estimation Calculators - Professional Tools for Materials Estimation

Estimate materials accurately for construction and DIY projects including lumber, concrete, paint, and more.

Right Triangle Calculator (Solve Sides, Angles, Area, Perimeter) | CalcDomain

Solve a right triangle completely! Calculate all missing sides (a, b, c), angles (α, β), area, and perimeter using the Pythagorean theorem and trigonometry (SOHCAHTOA).

Life Insurance Needs Calculator

Calculate your life insurance needs with our interactive tool, designed to provide personalized insurance estimates.

Kentucky State Income Tax Calculator | CalcDomain

Use our authoritative Kentucky income tax calculator to estimate your 2024–2023 state taxes. Mobile-first, WCAG-compliant, and optimized for accuracy, speed, and SEO.

Cost of Living Calculator

Use our interactive Cost of Living Calculator to compare expenses and budget effectively when moving to a new city.

Darcy's Law Groundwater Flow Calculator

Calculate groundwater flow using Darcy

Child Tax Credit Calculator | US Federal Tax | CalcDomain

Estimate your U.S. federal Child Tax Credit (CTC) and refundable Additional Child Tax Credit (ACTC) for 2023 or 2024. Includes phaseout by filing status, MAGI, and earned income—WCAG-accessible, mobile-first, and fast.

Serial Dilution Calculator

Accurately calculate serial dilutions for life sciences with our interactive Serial Dilution Calculator. Optimized for performance and accessibility.

Date Range Calculator - Find Duration Between Dates

Easily calculate the duration (days, weeks, months, years) between two dates. Includes options for work days and including the end date.

Molarity Calculator | Chemistry Tool | CalcDomain

Professional molarity calculator to compute solution concentration (M), required mass of solute, or required volume. Supports unit conversions (µg–g, µL–L, µM–M), inline validation, and step-by-step methodology.

Q-Q Plot Generator (Normality & Other Distributions)

Paste your data and generate an interactive Q-Q plot to check normality or compare against uniform/exponential distributions. Shows line of best fit, correlation, and the ordered sample vs theoretical quantiles table.

Cone Calculator — Volume, Surface Area, Slant Height & Angles

Professional cone calculator: compute volume, lateral and total surface area, slant height, base radius/diameter, and apex angle from your choice of inputs. Mobile-first, accessible, and accurate.

Scientific Calculator – online, free, with DEG/RAD, history & memory

Powerful online scientific calculator. Supports parentheses, exponents, roots, trigonometric functions in degrees or radians, logarithms, constants π and e, memory keys, and calculation history.

Noise Pollution (Decibel) Calculator

Calculate noise pollution levels using our interactive decibel calculator. Tailored for environmental engineers and professionals seeking precision.

Cholesterol Calculator — LDL, Ratios & Conversions

Professional cholesterol calculator: compute LDL-C (Friedewald or NIH Sampson), non-HDL, TC/HDL ratio, and unit conversions (mg/dL ⇆ mmol/L). Includes formulas, methodology, examples, and FAQs.

CCTV Storage & Bandwidth Hardware Calculator

Calculate required storage and network bandwidth for CCTV systems. Input cameras, resolution, frame rate, and retention time to get accurate hardware estimations.

Relativistic Kinetic Energy Calculator

Calculate relativistic kinetic energy with precision using our authoritative calculator. Ideal for physics students and enthusiasts.

Exercise Calculator: Estimate Calories Burned

Estimate calories burned during exercise based on your body weight, activity duration, and the activity

Superhero Name Generator

Generate unique superhero names with our interactive tool. Fun and easy to use for everyone!

Kilometers to Miles (km to miles) Converter

Instantly convert kilometers (km) to miles (mi) and kph to mph. Our bidirectional tool is perfect for distance and speed, with mental math tricks and charts.

Valence Electrons Calculator

Calculate the number of valence electrons for any element quickly and accurately with our interactive calculator.

Viscosity Converter: Dynamic (Pa·s, cP) & Kinematic (St, cSt)

Professional viscosity converter for engineers and technicians. Convert dynamic viscosity (Pa·s, mPa·s, Poise, cP) and kinematic viscosity (Stokes, cSt, m²/s) and interconvert via density. Includes formulas and reference tables.

Rhode Island State Income Tax Calculator

Use our Rhode Island income tax calculator to estimate your state income tax from your Rhode Island taxable income. Fast, accessible, mobile-first, and based on the official RI rate schedule.

Calorie to BTU Converter (cal, kcal, BTU, kJ)

Convert calories to BTU and back, including kilocalories (kcal) and BTU (IT). Also convert heat power units like kcal/h, BTU/h and watts. Engineering-grade, transparent formulas.

Covariance Calculator

Use our Covariance Calculator for precise risk management in finance. Calculate covariance easily for your financial portfolios.

State-Space to Transfer Function Converter

Convert state-space representations to transfer functions with our precise, user-friendly online tool.

Square Yard to Square Foot Converter (sq yd ⇄ sq ft)

Instant square yard to square foot converter. Enter area in sq yd to get sq ft, sq m, sq in and more. Includes formula, table, and real estate–friendly units. Accurate for property, construction and renovation.

Teaspoons to Milliliters Converter (tsp ⇄ mL)

Instant tsp to mL converter with support for US teaspoon (4.9289 mL), metric teaspoon (5 mL), and UK teaspoon (5.919 mL). Includes reverse mL to tsp, quick tables, formulas and notes for cooking and medication.

Plate Tectonics Velocity Calculator

Calculate the velocity of tectonic plates with our advanced, authoritative tool based on scientific data and methods.

Critical Angle Calculator

Calculate the critical angle for total internal reflection in optics using our precise, professional-grade calculator. Perfect for physics students and professionals.

Bits to Bytes Converter (bit ⇄ B, kbit, kB)

Convert bits to bytes instantly. Supports bit, kilobit, megabit, byte, kilobyte, megabyte and both decimal (kB, MB) and binary (KiB, MiB) styles. Includes formulas and examples for networking and storage.

Caulk Calculator - Estimate Sealant Cartridges Needed

Accurately calculate the number of caulk or sealant cartridges needed for your project. Enter joint length, width, depth, tube size, and waste factor for instant results.

Concrete Footing Calculator | CalcDomain

Professional concrete footing calculator for strip, pad, and pier footings. Get instant concrete volume, bag counts, weight, and cost estimates with waste factor. WCAG 2.1 AA accessible and mobile-first.

TV Size & Viewing Distance Calculator

Calculate the optimal TV size and viewing distance for your room with our interactive tool. Ensure the perfect home theater setup.

D&D Character Name Generator

Generate unique Dungeons & Dragons character names effortlessly with our interactive tool. Perfect for players and Dungeon Masters alike.

Materials Calculators | CalcDomain

Materials engineering calculators for properties, metals & alloys, polymers & composites, ceramics & glass, fracture & fatigue, diffusion & phase diagrams, and test standards. Clear inputs, instant results.

Words to Numbers Converter (English Text to Numeric)

Convert number words like

Lotka-Volterra (Predator-Prey) Model Simulator

An advanced Lotka-Volterra calculator for simulating predator-prey dynamics in ecological studies.

Pediatric Blood Pressure Percentile Calculator

An authoritative tool to calculate pediatric blood pressure percentiles, based on age, gender, and height, ensuring adherence to the latest guidelines.

Days of Payables Outstanding (DPO) Calculator

Calculate the Days of Payables Outstanding (DPO) to efficiently manage your working capital. Essential for finance professionals.

Cubic Feet to Gallons Converter (ft³ ⇄ gal US, UK, dry)

Convert cubic feet to gallons instantly. Supports US liquid gallons, US dry gallons, and UK/Imperial gallons. Includes reverse gallons to cubic feet, formulas, and handy tables for water, tanks, and irrigation.

AASHTO LRFD Bridge Design Calculators | CalcDomain

Bridge load combos, girder design, decks, bearings, and substructure checks.

Lorem Ipsum Generator

Generate custom Lorem Ipsum text with our advanced Lorem Ipsum Generator, designed for developers, designers, and content creators.

Angle Converter: Degrees, Radians, Gradians, DMS & Turns

Free angle converter to convert between degrees, radians, gradians (gons), degree-minute-second (DMS) and turns. Includes formulas, examples, and quick reference tables for math, surveying, navigation, and engineering.

Drag Coefficient Calculator

Calculate the drag coefficient for aerospace engineering projects easily with our interactive tool.

Anagram Solver

Advanced Anagram Solver to help you find anagrams for any word or phrase. Perfect for word games and puzzles enthusiasts.

Gravitational Lensing Calculator

Calculate gravitational lensing effects with precision using our advanced tool designed for physics enthusiasts and professionals.

Push-Up Test Calculator

Accurately calculate your push-up test results. Ideal for fitness enthusiasts and professionals wanting to assess upper body strength.

Mass & Weight Conversions (kg, lb, oz, N, kgf)

Convert between mass and weight units: kilograms, grams, metric tons, pounds, ounces, stones, US/UK tons, plus force-based weight units like newtons and kilogram-force. Includes formulas and explanations.

Normal Line Calculator: Find Normal to a Curve at a Point | CalcDomain

Normal line calculator for y = f(x). Enter a function and an x-value (or point) to get the tangent slope, the normal line equation, and the tangent line equation. Shows special cases when the normal is vertical or horizontal.

Reactor Design Calculator (CSTR & PFR) | Engineering Tools

Calculate reactor design parameters for Continuous Stirred Tank Reactor (CSTR) and Plug Flow Reactor (PFR) with our precise, accessible online tool.

Tablespoons to Milliliters Converter (tbsp ⇄ mL)

Convert tablespoons to milliliters instantly. Supports US tbsp (14.7868 mL), metric tbsp (15 mL), UK tbsp (17.758 mL) and Australian tbsp (20 mL). Includes reverse mL to tbsp, quick tables, formulas and cooking notes.

Pixels to Ems Converter (px ⇄ em ⇄ rem)

Convert pixels to ems and rems instantly. Set your root font-size (HTML) and element/context font-size to get accurate responsive CSS values. Includes formulas, quick tables, and FAQs for web designers.

Series and Parallel Resistor Calculator | CalcDomain

Professional series and parallel resistor calculator. Add unlimited resistors, choose units (Ω, kΩ, MΩ), and get instant, accessible results with formulas, worked example, and FAQs.

Eurocode 7 Slope Stability Calculator

An authoritative tool for calculating slope stability using Eurocode 7 guidelines. Designed for civil engineers and geotechnical experts.

Aircraft Weight and Balance Calculator

Calculate the aircraft weight and balance with precision using our advanced calculator for aerospace engineering.

BTU to Calories Converter (BTU ⇄ cal ⇄ kcal)

Convert BTU to calories quickly and precisely. Supports different BTU definitions (IT, thermochemical, mean) and different calories (thermochemical, IT, 15°C, kilocalorie). Includes reverse calories to BTU, formulas, and reference tables.

Eurocode 7 Bearing Resistance Calculator

Calculate the bearing resistance according to Eurocode 7 with our expert tool, ensuring precision and reliability for civil engineering projects.

Stock Average Down Calculator

Calculate your new average stock price after buying additional shares at a different price. Use our Stock Average Down Calculator for precise computations.

Circle Calculator: Area, Circumference, Diameter, and Equation | CalcDomain

Calculate all geometric properties of a circle (Area, Circumference, Diameter, Radius) instantly from any one known input. Includes the standard circle equation solver.

Cam Profile Design Calculator

An advanced calculator for designing cam profiles, essential for mechanical engineering solutions.

Therms to BTU Converter (therm ⇄ BTU)

Convert therms to BTU and BTU to therms instantly. Supports US therm (100,000 BTU), UK/EC therm, and different BTU definitions (IT, thermochemical, mean). Includes reference table, formulas, and FAQs for HVAC and energy billing.

Georgia State Income Tax Calculator

Estimate your 2024 Georgia state income tax with a professional, WCAG-compliant calculator. Uses Georgia’s flat 5.49% rate with adjustable deductions, exemptions, and per-paycheck breakdowns.

Accessibility Statement | CalcDomain

Accessibility Statement for CalcDomain professional calculator platform.

Limit Calculator – Numerical Limits of Functions (Left, Right & Two-Sided)

Compute numerical limits of real-valued functions: left-hand, right-hand and two-sided limits, plus limits at infinity. Supports sin, cos, ln, sqrt, powers and more, with examples and explanations.

Earnings Per Share (EPS) Calculator

Calculate Earnings Per Share (EPS) efficiently with our authoritative, accessible, and mobile-friendly EPS calculator.

Concrete Admixture Dosage Calculator | Concrete Mix Design

Professional concrete admixture calculator. Compute total admixture dosage by percent of cement, per 100 kg/lb, or per unit volume. Supports metric and US customary units, with accessible, mobile-first UX.

NEC Service Load Calculator (Non-Dwelling) | CalcDomain

NEC commercial load calculation made easy. Compute non-dwelling service loads per NEC Article 220 with an accessible, mobile-first calculator. Includes lighting, receptacles, motors (largest at 125%), and noncoincident HVAC.

Calculator Title - Replace Me

Short, keyword-rich summary of what this calculator solves.

Mayan Calendar Converter

Convert Gregorian dates to the Mayan calendar system easily with our interactive and accessible Mayan Calendar Converter.

Canada Taxes | CalcDomain Finance

Canadian federal and provincial tax tools, payroll, CPP/EI, GST/HST—plus quick links by province/territory.

CHA2DS2-VASc Score Calculator

Calculate your CHA2DS2-VASc score to assess stroke risk in patients with atrial fibrillation.

Roman Numeral Converter (Number ⇆ Roman + Date to Roman)

Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999, validation, and even date-to-Roman formatting. Includes rules, table of symbols, and FAQ.

Joules to BTU (J to BTU) Converter

Instantly convert Joules (J) to BTU and Kilojoules (kJ). Our dual calculator also converts power from Watts (J/s) to BTU/hr for scientific and engineering use.

Auto Lease Calculator - Calculate Monthly Lease Payments | CalcDomain

Professional auto lease calculator to estimate monthly lease payments, depreciation, finance charges, taxes, and total lease cost. Accurate, accessible, and mobile-friendly.

Turkey Size & Thawing Time Calculator

Calculate the ideal turkey size and thawing time for your Thanksgiving feast with our interactive calculator.

ASCE 7-22 Snow Load Calculator | CalcDomain

Professional ASCE 7-22 snow load calculator. Compute flat roof snow load (pf) and optional sloped roof load using Ce, Ct, I, and site-specific ground snow load (pg). Includes methodology, LaTeX formulas, glossary, worked example, and FAQs.

Molecular Formula Calculator

Calculate molecular formulas with precision using our authoritative tool. Ideal for chemists and students.

Car Lease vs. Buy Calculator

Determine whether leasing or buying a car is more cost-effective with our advanced calculator.

German Income Tax Calculator

Authoritative German income tax calculator for 2024. Estimate your income tax (ESt), church tax, and solidarity surcharge with spouse splitting. WCAG 2.1 AA accessible, mobile-first, fast.

Crossword Solver

An advanced tool to help solve crosswords quickly and efficiently. Perfect for enthusiasts and beginners alike.

Number Needed to Harm (NNH) Calculator

Calculate the Number Needed to Harm (NNH) with our interactive, accessible tool. Designed for healthcare professionals to assess treatment side effects.

homebrew abv calculator | Precise, Accessible, Mobile-First Tool

Homebrew ABV calculator: compute Alcohol by Volume (ABV) and Alcohol by Weight (ABW) from Original Gravity (OG) and Final Gravity (FG). Includes advanced Terrill method, hydrometer temperature correction, and Plato conversions.

Loading Dose Calculator

Calculate the loading dose of medication with our authoritative tool, ensuring precise pharmacological dosing.

BRRRR Method Calculator | Finance Tools

Calculate your real estate investment returns using the BRRRR method with our advanced, accessible, and mobile-friendly calculator.

Log Reduction Calculator

Use our Log Reduction Calculator to easily compute the reduction in microbial count following disinfection or sterilization processes, tailored for life science experts.

Potassium Calculator — Daily Intake, %AI, and Sodium:Potassium Ratio

Compute your daily potassium (K) intake from foods, compare to Adequate Intake (AI) by age/sex, and get your sodium-to-potassium ratio. Includes accessible UI, clear formulas, and authoritative sources.

Volume & Capacity Conversions (L, m³, gal, cups, fl oz)

Convert volume and capacity units instantly: liters, milliliters, cubic meters, US gallons, imperial gallons, cups, fluid ounces, tablespoons and more. Includes formulas, tables and classroom notes.

Carbon Dating Calculator

Calculate the age of an artifact using our precise Carbon Dating Calculator. Designed for scientists and students in the field of Life and Earth Sciences.

Quarts to Cups Converter (US liquid, US dry, Imperial)

Convert quarts to cups instantly. Supports US liquid quart (1 qt = 4 cups), US dry quart, and Imperial quart. Includes reverse cups to quarts, formula, quick tables and cooking notes.

Foundation Calculator - Estimate Concrete Volume & Bags

Calculate the concrete volume (cubic yards/meters) and pre-mix bags needed for slab, footing, or pier foundations. Accurate, easy, and free.

Canadian Federal Income Tax Calculator

Calculate your Canadian federal income tax with ease using our comprehensive calculator. Understand your tax obligations and manage your finances efficiently.

Slugs to Kilograms Converter (slug ⇄ kg)

Convert slugs to kilograms and kilograms to slugs instantly. Uses the standard definition 1 slug = 14.59390294 kg based on g = 9.80665 m/s². Includes formulas, physics notes, and FAQs.

calendar calculator — Add/Subtract Dates, Day Counter, Business Days

Calendar calculator to add or subtract days, months, or years; find the difference between dates; count business days (with holidays); and get weekday & ISO week.

Parking Lot Layout Calculator

Calculate the optimal layout for your parking lot with our authoritative and interactive calculator.

Venn Diagram Generator

Create and customize Venn diagrams effortlessly with our interactive generator. Ideal for educators, students, and professionals who need to visualize data intersections.

Hourly to Salary Converter

Convert hourly wages to an annual salary easily with our professional-grade calculator. Perfect for job seekers and employers alike.

Recycling Savings Calculator

Calculate your potential savings from recycling with our interactive Recycling Savings Calculator. Designed for environmentally conscious individuals and businesses.

NFL Passer Rating Calculator

Calculate NFL passer rating with our interactive, accessible, and authoritative tool, designed for football enthusiasts and professionals.

Maintenance Dose Calculator

Calculate maintenance doses accurately with our interactive maintenance dose calculator. A resource for healthcare professionals and pharmacologists.

Texas State Income Tax Calculator

Texas has no state income tax. Use this professional, mobile-first calculator to confirm your Texas state income tax is $0 and see your after-state-tax income by pay period.

ISBN Validator (ISBN-10 & ISBN-13 Checker + Converter)

Validate ISBN-10 and ISBN-13 instantly. Paste an ISBN with or without hyphens, check the checksum, and convert between ISBN-10 and ISBN-13 (when possible). Shows step-by-step checksum calculation.

Inches to Picas Converter (in ⇄ picas ⇄ points)

Convert inches to picas and picas to inches instantly. Supports PostScript/desktop-publishing standard (1 in = 6 picas = 72 points) and traditional ATA. Includes bidirectional calculator, formulas, and quick typography tables.

Breadth-First Search (BFS) Calculator

An authoritative tool to perform Breadth-First Search (BFS) on graph data. Optimize your graph traversal with this user-friendly and accessible calculator.

Days of Sales Outstanding (DSO) Calculator

Calculate Days of Sales Outstanding (DSO) to manage your working capital effectively. This tool helps businesses calculate the average number of days it takes to collect payment after a sale.

Gear Ratio Calculator - Calculate Speed, RPM & Ratios

Calculate simple gear ratios from teeth counts, or find your vehicle

Solar Panel Output Calculator | Engineering

Calculate solar panel output efficiently with our interactive tool. Designed for engineers and environmentally-conscious users.

Maryland County Income Tax Calculator

Calculate your Maryland county income tax with ease using our interactive and authoritative calculator tool.

Help Center | CalcDomain

Help Center for CalcDomain professional calculator platform.

Decagon Calculator (Area, Perimeter, Side, Inradius, Circumradius)

Regular decagon calculator to find area, perimeter, side length, inradius (apothem) and circumradius. Enter any one value — side, perimeter, area, inradius or circumradius — and get all the others. Includes decagon formulas, golden–ratio notes and FAQ.

Massachusetts State Income Tax Calculator

Professional Massachusetts income tax calculator. Estimate MA state tax, Fair Share (millionaire’s) surtax, effective rate and after-tax income using transparent, WCAG-compliant methods.

APACHE II Score Calculator

Calculate APACHE II scores to assess the severity of disease in critically ill patients. Developed by Ugo Candido.

Absenteeism Rate Calculator | Business Operations HR Tool

Calculate absenteeism rates accurately for your business operations and human resources management with our advanced, accessible tool.

Dividend Yield on Cost Calculator

Calculate your investment

Wood Shear Wall Design Calculator (NDS/SDPWS)

Use our Wood Shear Wall Design Calculator to determine optimal wall design for construction projects adhering to NDS/SDPWS guidelines.

Illinois State Income Tax Calculator

Illinois income tax calculator: estimate your Illinois state income tax with a fast, accurate, and accessible tool. Supports filing status, pre-tax deductions, exemptions, and clear breakdowns.

Eurocode 1 Thermal Actions Calculator

Calculate thermal actions on structures according to Eurocode 1, tailored for civil engineering professionals.

Ohio Municipal Income Tax Calculator

Calculate Ohio municipal income taxes with precision. Use our authoritative and accessible online tool for accurate results.

Cat Medication Dosage Calculator

Calculate the correct medication dosage for your cat based on weight and medication concentration.

MELD Score Calculator

Calculate the MELD score for liver disease patients with our authoritative, accessible tool.

Time of Concentration Calculator | Engineering Hydrology

Calculate the time of concentration for hydrology engineering projects using our authoritative and comprehensive calculator.

Construction Delay Analysis Calculator

An authoritative tool for analyzing construction delays, helping project managers and engineers accurately assess the impact of project delays.

Eurocode 4 Composite Column Design Calculator

Calculate composite column design parameters as per Eurocode 4 with our comprehensive and accessible online tool.

Swimming Pace Calculator

Calculate your swimming pace to optimize your training and performance. Designed with accessibility and mobile-first principles.

Body Fat Calculator | Health & Fitness Body Metrics

Professional body fat calculator using the U.S. Navy circumference method and Deurenberg BMI estimate. Mobile-first, accessible, and accurate.

Real Options Valuation Calculator

Calculate the value of real options with our advanced corporate finance tool, designed for professionals in the finance industry.

Atmospheres to PSI (atm to psi) Converter

Instantly convert atmospheres (atm) to PSI, bar, kPa, and Torr (mmHg). Our 5-way pressure converter is built for scientific and engineering accuracy.

Mann-Whitney U Test Calculator

Calculate the Mann-Whitney U Test with ease using our interactive online calculator. Ideal for statisticians and researchers seeking accurate non-parametric test results.

Mortar Mix Calculator

Easily calculate the amount of mortar mix needed for your DIY projects with this authoritative tool.

Maryland State Income Tax Calculator

Authoritative, mobile-first Maryland income tax calculator for residents. Estimate Maryland state and local county taxes using 2024 brackets with accessible, professional UX.

Calculus Calculator – Derivatives, Integrals & Limits

Interactive calculus calculator for derivatives, integrals and limits. Enter a function f(x) and instantly compute f′(x), definite integrals and limits with transparent numeric methods.

Schofield Equation Calculator

Calculate your Basal Metabolic Rate using the Schofield Equation with our precise, professional-grade online tool.

Excavation Calculator: Volume, Spoil, Swell & Truck Loads

Calculate excavation volume (cubic yards/meters), soil swell (bulking), spoil, and truck loads. Get accurate estimates for trench, footing, or basement excavation.

Business Loan Calculator | CalcDomain

Professional Business Loan Calculator. Estimate periodic payments, payoff time, total interest, and fees for small business loans. Supports extra payments, origination fees, and multiple payment frequencies.

Atmospheres to PSI Converter – atm to PSI and PSI to atm

Convert pressure between atmospheres (atm) and pounds per square inch (PSI).

Relative Strength Index (RSI) Calculator

Calculate the Relative Strength Index (RSI) for better trading decisions with our intuitive calculator.

Rounding Calculator – Round Numbers, Decimals & Significant Figures

Smart rounding calculator for decimals, whole numbers and significant figures. Choose rounding mode (nearest, up, down, bankers, toward/away from zero, to a multiple) and see transparent results and error.

California Local Sales Tax Calculator

Calculate local sales tax in California with our authoritative and accessible calculator. Perfect for residents and businesses dealing with Californian sales tax.

ERA (Earned Run Average) Calculator

Calculate the Earned Run Average (ERA) for baseball pitchers quickly and accurately with our accessible and user-friendly calculator.

Regular N-gon Calculator (Area, Perimeter, Apothem, Radius) | CalcDomain

Calculate all geometric properties of a regular polygon (N-gon), including Area, Perimeter, Apothem, and Radius, by inputting the number of sides (N) and any one dimension.

Early Retirement (FIRE) Calculator

Calculate your financial independence and early retirement needs with our advanced FIRE calculator.

eV to Joules Converter (electronvolts ⇄ J)

Convert electronvolts (eV) to joules (J) and joules to eV instantly. Uses the exact 2019 SI value 1 eV = 1.602176634×10⁻¹⁹ J. Supports keV, MeV, GeV, and scientific notation for physics and engineering.

Milliliters to Cups (ml to cups) Converter

Instantly convert milliliters (ml) to cups, tablespoons (tbsp), and teaspoons (tsp). Our 4-way kitchen calculator handles US Customary, US Legal, and Metric cups.

Wind Load Calculator (ASCE 7-16)

Calculate wind loads according to ASCE 7-16 standards with our authoritative tool. Optimized for accuracy, performance, and accessibility.

Length Converter (m, km, miles, feet, inches, cm)

Convert length units instantly: meters, kilometers, miles, feet, inches, centimeters, millimeters, yards and nautical miles. Smart filters for metric/imperial, formulas and quick reference tables.

Quadratic Formula Calculator – Step-by-Step Solver for ax² + bx + c = 0

Quadratic formula calculator that solves ax² + bx + c = 0 step by step. Enter a, b and c to get the discriminant, nature of the roots, exact formula steps, decimal approximations and vertex.

Online Graphing Calculator (Plot Multiple Functions) | CalcDomain

Free online graphing calculator. Plot up to 3 functions, set x/y range, sample points, and inspect values. Supports sin, cos, tan, exp, log, piecewise and compositions. Ideal for algebra, precalculus and calculus.

HAS-BLED Score Calculator

Calculate the HAS-BLED score to assess bleeding risk in patients with atrial fibrillation. A precise, accessible, and authoritative tool for healthcare professionals.

Membrane Separation Calculator

Advanced Membrane Separation Calculator for chemical engineering applications. Calculate key metrics instantly with our authoritative tool.

Bathroom Layout Calculator - Check Clearances & Spacing

Check if your bathroom layout meets standard building code and design clearances. Enter your measurements for toilets, vanities, and showers to get instant pass/fail feedback.

Pints to Cups Converter (US liquid, US dry, Imperial)

Convert pints to cups instantly. Supports US liquid pint (1 pt = 2 cups), US dry pint, and Imperial pint. Includes reverse cups to pints, formulas, quick tables, and cooking notes.

Mixed Number Calculator – Convert Between Mixed Numbers & Improper Fractions

Mixed number calculator that converts between mixed numbers and improper fractions, simplifies results, and shows step-by-step working plus decimal form. Great for homework, teaching, and self-study.

Statistical Power Calculator & Power Analysis

Online statistical power calculator for A/B tests and experiments. Estimate power from effect size, sample size, standard deviation or proportions. Includes formulas, interpretation, and sample size suggestion.

Big Number Calculator & Formatter (Very Large Integers)

Work with very large integers: add, subtract, multiply, format with commas, convert to scientific notation, and get the English name for short-scale numbers. Handles numbers far beyond JavaScript’s normal limits.

Power Unit Converter (W, kW, HP, BTU/hr, ton)

Convert power units instantly: watts, kilowatts, horsepower (mechanical & metric), BTU per hour, refrigeration tons, megawatts and more. Engineering-friendly, HVAC-ready, with formulas and quick tables.

Alien Civilization Calculator (Drake Equation)

Interactive Drake Equation calculator to estimate the number of active extraterrestrial civilizations in the Milky Way galaxy.

Expected Date of Delivery (EDD) Calculator

This tool calculates your expected date of delivery with our EDD calculator, based on reliable medical data. Perfect for expecting parents and healthcare professionals.

Shaft Design Calculator

Interactive Shaft Design Calculator for mechanical engineering. Calculate optimal shaft dimensions for strength and performance.

Credit Card Payoff Calculator

Use our Credit Card Payoff Calculator to determine the repayment schedule to pay off your credit card debt efficiently.

Altman Z-Score Calculator

Calculate your company

Fourier Series Calculator

A comprehensive Fourier series calculator designed for students and professionals in calculus and mathematics.

hp to kw converter: Accurate Horsepower to Kilowatt Calculator

Instantly convert horsepower (hp) to kilowatts (kW) with our accessible, high-precision calculator. Supports mechanical, electrical, and metric hp (PS).

Filter Design Calculator (Butterworth, Chebyshev)

An authoritative filter design calculator for Butterworth and Chebyshev filters, optimized for electrical engineering applications.

Mortgage Payment Calculator | CalcDomain

Estimate your monthly P&I, include escrow costs (taxes & insurance), and see how extra payments affect your payoff date.

Relative Valuation (Comparable Company Analysis) Calculator

Use our interactive calculator to perform a Comparable Company Analysis for assessing company valuation.

Hill Cipher Encoder/Decoder (2×2 Matrix, Mod 26)

Encrypt and decrypt text with the Hill cipher. Enter a 2×2 key matrix, check if it’s invertible modulo 26, and instantly encode or decode messages. Includes steps, formula, and FAQs.

HEART Score Calculator

Calculate the HEART score for major cardiac events with our precise, professional-grade tool designed for medical professionals.

Hardy-Weinberg Equilibrium Calculator | Science › Biology

Professional Hardy-Weinberg equilibrium calculator. Compute allele frequencies (p and q), expected genotype frequencies and counts, and a chi-square test for HWE. Mobile-first, accessible, and optimized for accuracy.

Rankine to Celsius Converter (°R ⇄ °C)

Convert Rankine to Celsius with the exact formula: °C = (°R − 491.67) × 5/9. Bidirectional tool: convert Rankine to Celsius, Celsius to Rankine, and also see Kelvin and Fahrenheit. Includes explanation, tables and FAQ.

Date Difference Calculator – Days, Weeks, Months & Years

Free date difference calculator. Compute exact days, weeks, business days, months and years between two dates. Inclusive/exclusive modes, holidays, and clear step‑by‑step method.

WHIP (Walks and Hits per Inning Pitched) Calculator

Calculate WHIP (Walks and Hits per Inning Pitched) for baseball pitchers easily with our interactive calculator.

Fracture Mechanics (Stress Intensity Factor) Calculator

Calculate the stress intensity factor in fracture mechanics using our precise, professional-grade tool designed for mechanical engineers.

Save Percentage Calculator

Calculate hockey save percentage easily with our interactive and authoritative tool, optimized for accessibility and performance.

Six Degrees of Kevin Bacon – Bacon Number Explainer & Tracker

Explore the Six Degrees of Kevin Bacon game, learn what a Bacon number is, try example chains between actors, and track your own degrees of separation step by step.

ACI Concrete Mix Design Calculator (Absolute Volume Method)

Professional ACI concrete mix design calculator using the Absolute Volume Method. Compute cement, water, fine and coarse aggregate quantities per m³ or per yd³ with moisture corrections and WCAG 2.1 AA accessibility.

Lottery Tax Calculator

Calculate your lottery winnings after taxes with our Lottery Tax Calculator. Understand how much you keep after taxes on lottery prizes.

Precedent Transaction Analysis Calculator

Use our Precedent Transaction Analysis Calculator to evaluate finance valuation metrics.

Alabama Local Sales Tax Calculator

Calculate the local sales tax in Alabama with our interactive tool. Ideal for businesses and consumers to determine tax obligations accurately.

Random Fact Generator

Discover fascinating facts with our Random Fact Generator. An engaging and informative tool for anyone curious about the world around them.

Priming Sugar Calculator for Homebrewing - Bottle Carbonation Guide

Professional priming sugar calculator for bottling beer. Calculate exact sugar amounts for your batch using temperature-adjusted residual CO2 and beer style targets. Fast, accurate, and easy to use.

Bioreactor Design Calculator

Calculate the optimal design parameters for bioreactors with precision using our Bioreactor Design Calculator.

Mortgage Affordability Methodology & Guide | CalcDomain

Complete guide to mortgage affordability calculations, DTI ratios, loan types, and home buying process. Evidence-based methodology using CFPB and HUD guidelines.

Pressure Conversions (Pa, bar, psi, atm, torr)

Convert pressure units instantly: pascal (Pa), kilopascal (kPa), bar, millibar, psi, atmospheres, torr, mmHg, inHg, inH2O, and kg/cm². Engineering, lab, HVAC, and weather-friendly pressure converter with formulas and tables.

Limiting Reactant Calculator | Science • Chemistry

Limiting reactant calculator: determine the limiting reagent, theoretical yield, and excess reactants from stoichiometry. Mobile-first, accessible, and accurate.

Arkansas State Income Tax Calculator

Authoritative Arkansas income tax calculator. Estimate your 2024 Arkansas state income tax, marginal rate, and effective rate. Mobile-first, accessible, and based on Arkansas DFA tax brackets.

Proportion Calculator (Solve for x in Ratios) | CalcDomain

Easily solve proportion equations with our free calculator. Solves for x in formats like A/B = C/x or A:B = C:D. Shows step-by-step cross-multiplication.

Smith Chart Calculator

Interactive Smith Chart Calculator for advanced electrical engineering applications. Calculate and visualize impedance matching with ease.

Shannon Diversity Index Calculator

Calculate the Shannon Diversity Index for ecological studies with our interactive, accessible calculator.

RRSP (Registered Retirement Savings Plan) Calculator

Calculate your RRSP contributions and savings with our comprehensive and accessible RRSP Calculator.

F-Test Calculator (Compare Two Variances)

Online F-test calculator to compare two variances. Enter sample sizes and sample variances (or standard deviations), choose the tail, and get F statistic, degrees of freedom, and p-value. Includes formulas and FAQ.

P-value Calculator (z, t, χ², F) with Interpretation

Calculate the p-value for your statistical test. Supports z-test, t-test, chi-square test, and F-test. Choose the tail, enter the test statistic and degrees of freedom, and get the p-value plus a plain-language interpretation.

Coffee Cost Calculator

Calculate the cost of your coffee consumption with our interactive Coffee Cost Calculator. Perfect for personal finance management in the niche coffee sector.

Auto Loan Calculator - Calculate Monthly Car Payments | CalcDomain

Professional auto loan calculator to estimate monthly car payments, total interest, amount financed, and impact of sales tax and fees. Fast, accurate, and mobile-friendly.

Alabama State Income Tax Calculator

Authoritative Alabama income tax calculator. Estimate Alabama state income tax by filing status using 2024–2025 marginal rates, effective rate, and after‑tax income. WCAG-accessible, mobile-first, and fast.

Lumens to Watts Converter (LED, CFL, Incandescent)

Convert lumens to watts and watts to lumens for LED, CFL, halogen and incandescent bulbs. Choose the light source efficiency and get realistic power usage. Includes formulas, chart and FAQs.

Age Calculator - Calculate Your Age in Years, Months, and Days

Easily calculate your age from your date of birth. See your exact age in years, months, weeks, and days, plus the time until your next birthday.

Fastener Calculator - Estimate Screws/Nails for Decking & Framing

Estimate the total number of fasteners (screws or nails) needed for your decking, subfloor, or framing project. Enter area, joist spacing, and board width.

Decking Calculator - Estimate Boards, Joists & Materials

Accurately calculate all materials for your deck project: decking boards, joists, bearers, stumps, and screws. Get instant estimates with wastage included.

Double-Slit Interference Calculator

Accurately calculate the interference pattern of a double-slit experiment using this interactive tool.

Business Mileage Calculator

Calculate your business mileage effortlessly with our authoritative Business Mileage Calculator. Optimize your travel expenses efficiently.

Payback Period Calculator (Simple & Discounted) | Finance & Investment

Professional Payback Period calculator that computes simple and discounted payback with fractional period interpolation. Clean UX, step-by-step example, formulas, and FAQ.

Depth-First Search (DFS) Visual Tool

Interactive depth-first search (DFS) tool. Paste an adjacency list, choose directed or undirected, select a start node, and see visit order, discovery/finish times, and DFS tree edges. Includes explanation, formulae, and FAQs.

Vapor-Liquid Equilibrium (VLE) Calculator

Calculate Vapor-Liquid Equilibrium (VLE) for binary mixtures using this advanced chemical engineering tool.

Auto Insurance Calculator - Estimate Your Premium

Estimate your annual and monthly car insurance costs based on key factors like age, vehicle, and driving record. Understand how rates are calculated.

HRA Calculator

Calculate your HRA exemption easily with our tool. Perfect for salaried individuals living in rented accommodation.

YMCA Step Test Calculator

Calculate your fitness level using the YMCA Step Test Calculator. Perfect for health and fitness enthusiasts looking to assess cardiovascular fitness.

Superannuation Calculator

Calculate your superannuation contributions and project your balance at retirement with our authoritative tool.

GST Calculator India

Calculate Goods and Services Tax (GST) at different slab rates (5%, 12%, 18%, 28%) in India. Add or remove GST, understand CGST, SGST, and IGST with our authoritative tool.

Binomial Option Pricing Calculator

Calculate option prices using the Binomial Options Pricing Model with our interactive tool.

Tangent Line Calculator ($y = mx + b$) - Step-by-Step | CalcDomain

Calculate the equation of the tangent line to a function $f(x)$ at a given point $x_0$. Finds the derivative (slope) and displays the final equation $y = mx + b$ with detailed steps.

Historical Volatility Calculator

Calculate historical volatility for trading and options with our authoritative and user-friendly online tool.

Nanometers to Angstroms (nm to Å) Converter

Instantly convert nanometers (nm) to angstroms (Å), micrometers (µm), and meters (m). Our 4-way scientific converter is ideal for wavelength and atomic scale.

Category Title - Replace Me

One-paragraph summary of the calculators users will find in this category.

PAYG Calculator

Calculate the amount of tax to be withheld from your salary using the Australian PAYG withholding calculator.

Board Foot Calculator

Professional board foot calculator for woodworkers, contractors, and estimators. Compute board feet from thickness, width, length, quantity, add waste, and estimate cost. Metric and imperial supported.

Inventory Control (Newsvendor) Model Calculator

Use our professional-grade Newsvendor Model Calculator to optimize your inventory control decisions.

kWh to Joules Converter (kWh ⇄ J ⇄ Wh ⇄ kJ ⇄ MJ)

Instantly convert kilowatt-hours (kWh) to joules (J) and back. Uses the exact relation 1 kWh = 3,600,000 J. Also shows Wh, kJ and MJ. Includes formula, steps, and FAQ.

Bike Cadence Calculator

Calculate your bike cadence with our interactive tool, designed for cyclists seeking optimal performance.

Area Calculator – fast area of rectangles, triangles, circles & more

Use this free online area calculator to find the area of common 2D shapes: rectangle, square, triangle, circle, trapezoid, parallelogram, ellipse and sector. Formulas, examples and step-by-step guide.

Pennsylvania State Income Tax Calculator

Pennsylvania income tax calculator: estimate your PA state tax at the flat 3.07% rate and optional local Earned Income Tax (EIT). Annual or per‑paycheck mode. WCAG-accessible and mobile-first.

Soil Bearing Capacity Calculator

Calculate the bearing capacity of soil with our precise and authoritative geotechnical engineering tool.

Rockwell Hardness Converter

Convert Rockwell hardness values precisely with our authoritative Rockwell Hardness Converter tool.

Kbps to Mbps Converter (decimal & binary)

Convert kilobits per second (kbps) to megabits per second (Mbps) instantly. Choose 1000- or 1024-based conversion, get reverse Mbps to kbps, quick table and explanations for networking speeds.

Feet per Second to MPH Converter | ft/s to Miles per Hour

Convert feet per second (ft/s) to miles per hour (mph) in one step. Uses exact relationship 1 mph = 1.46667 ft/s, so 1 ft/s = 0.681818 mph. Includes reverse mph to ft/s, presets, and formula.

Cylindrical to Cartesian Converter | Convert (r, θ, z) to (x, y, z)

Convert cylindrical coordinates (r, θ, z) to Cartesian coordinates (x, y, z). Supports degrees and radians, shows formulas, and is suitable for multivariable calculus, physics, and engineering.

Mach to MPH Converter | Convert Mach Number to Miles per Hour

Convert Mach to miles per hour (mph). Choose standard atmosphere (sea level to 36,000 ft) or enter a custom speed of sound. See formulas and aviation reference values.

Heron's Formula Calculator (Triangle Area from 3 Sides) | CalcDomain

Calculate the area of any triangle given the length of its three sides (a, b, c) using Heron

Feet of Water to PSI Converter (ft H₂O → psi)

Convert feet of water column (ft H2O) to PSI and back. Use standard 60°F water or change temperature to see the effect on pressure. Includes quick chart, formula and FAQ for plumbing, HVAC and pumping.

Crochet Calculator: Gauge, Yardage & Sizing Tool

The ultimate all-in-one crochet calculator for gauge, project sizing, starting chains, and yarn yardage. Get accurate results for any pattern.

Eurocode 8 Inter-Storey Drift Calculator

Calculate inter-storey drifts using Eurocode 8 standards. An authoritative engineering tool developed by Ugo Candido.

Cross Stitch Calculator - Calculate Fabric Size & Margin

Calculate the exact fabric dimensions needed for your cross stitch project. Enter stitch count, fabric count, and margin to get results in inches and centimeters.

Sports Timer & Stopwatch

An interactive sports timer and stopwatch tool to track your fitness activities accurately.

Currency Forward Rate Calculator

Calculate future exchange rates with our Currency Forward Rate Calculator. Ideal for international finance professionals seeking precise and reliable forward rate computations.

Body Surface Area (BSA) Dosing Calculator

Calculate BSA for medication dosing using our interactive BSA Dosing Calculator. Ensure accurate pharmacological dosing with ease.

FIR Filter Design Calculator

Interactive FIR Filter Design Calculator for signal processing engineers. Design FIR filters with ease and precision.

Future Value of an Annuity Calculator

Calculate the future value of an annuity investment with our precise, professional-grade online tool.

Linear Regression Calculator

Calculate linear regression easily with our advanced online calculator, tailored for statisticians and data enthusiasts.

Density Conversions (kg/m³, g/cm³, g/mL, lb/ft³, lb/in³)

Convert density units instantly: kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³, oz/in³ and specific gravity. Lab, chemistry, food, and engineering friendly density converter with formulas, tables and FAQ.

Scaffolding Load Calculator

Calculate the load capacity of scaffolding systems with precision. Discover how much load your scaffolding can bear based on industry standards.

Median Calculator: Find the Median of a Data Set Online | CalcDomain

Free online median calculator. Paste numbers separated by commas, spaces, or new lines and get the median instantly. Also shows sorted data, count, mean, mode, range, Q1, Q3, and IQR. Perfect for statistics, homework and data analysis.

College Savings Calculator (529 Plan)

Calculate your future college savings with our 529 Plan Calculator. Plan efficiently for your higher education expenses.

Skewness and Kurtosis Calculator – Shape of a Distribution

Skewness and kurtosis calculator: paste your data and get mean, variance, standard deviation, skewness, (excess) kurtosis, and a plain-English interpretation of the distribution shape.

Down Payment Calculator | Finance · Mortgages

Professional down payment calculator for homebuyers. Instantly compute down payment amount or percent, loan amount, LTV, monthly payment (P&I), estimated closing costs, PMI threshold, and time needed to save. WCAG 2.1 AA accessible and mobile-first.

401(k) vs. Roth 401(k) Calculator

Determine which retirement plan suits you best with our interactive 401(k) vs. Roth 401(k) calculator.

Sag and Tension Calculator for Overhead Lines

Calculate sag and tension for overhead electrical lines with precision using our interactive tool. Suitable for engineers and professionals in power systems.

Calculator Disclaimer | CalcDomain

Important disclaimer for CalcDomain calculators: scope, limitations, accuracy, and user responsibilities. Please read before use.

Rockport Walk Test VO2 Max Calculator

Calculate your VO2 Max using the Rockport Walk Test with our user-friendly and accessible online calculator.

Ergs to Joules Converter (erg → J)

Convert ergs to joules and joules to ergs instantly. Exact factor 1 erg = 1×10⁻⁷ joule (SI). Includes reverse conversion, scientific notation, formula, and FAQ for physics and astronomy.

Eurocode 5 Timber Beam Design Calculator

Professional Eurocode 5 timber beam calculator. Check bending, shear, and deflection for simply-supported rectangular beams per EN 1995-1-1 (EC5). Mobile-first, accessible, and precise.

Distillation Column Calculator (McCabe-Thiele)

Interactive McCabe-Thiele Distillation Column Calculator for chemical engineers. Optimize your distillation processes with accuracy.

Tipping Calculator

Calculate tips effortlessly with our interactive tipping calculator, designed for travelers and everyday use.

Chains to Feet Converter (survey & engineer’s chain)

Convert chains to feet and feet to chains instantly. Supports the standard 66 ft surveyor’s chain and the 100 ft engineer’s chain. Includes formulas, quick table, and surveying notes.

Anion Gap Calculator

Calculate the anion gap to assess acid-base disorders. A critical tool for healthcare professionals.

Credit Card Validator - Instantly Check Card Number Validity (Luhn Check)

Instantly validate any credit card number using the Luhn algorithm. Our secure, free tool checks number format, checksum, and identifies the card type (Visa, Mastercard, Amex, etc.).

Orbital Maneuver (Hohmann Transfer) Calculator

Calculate the optimal energy-efficient orbital transfer between two circular orbits using the Hohmann Transfer Calculator.

Kelvin to Celsius (K to °C) Converter

Instantly convert Kelvin (K) to Celsius (°C) and Fahrenheit (°F) with our all-in-one temperature converter. See the step-by-step formula and calculation.

Spacetime Interval Calculator

Calculate spacetime intervals using our interactive tool designed for physics enthusiasts and professionals.

Engine Displacement Calculator - Calculate CC and Cubic Inches

Calculate an engine

Goals Against Average (GAA) Calculator

Calculate your hockey Goals Against Average (GAA) with our intuitive and accessible online calculator.

Eurocode 9 Aluminum Column Design Calculator

A comprehensive Eurocode 9 Aluminum Column Design Calculator for civil engineers to design aluminum columns according to the Eurocode 9 standards.

Density Calculator | Science » Physics

Professional density calculator. Compute density, mass, or volume with unit conversions, geometry-assisted volume, and freight density class. Accessible, fast, and accurate.

Bridge Loan Calculator: Interest-Only, Retained & Rolled-Up | CalcDomain

Professional bridge loan calculator with LTV, fees, serviced/retained/rolled-up interest, net advance, redemption amount, and APR (IRR). Print a clean schedule.

Capital Gains Tax Calculator Australia

Calculate your Capital Gains Tax in Australia with our comprehensive and accessible tool. Understand how CGT works, including the 50% discount and exemptions.

Big-O Notation & Algorithm Complexity Calculator

Interactive Big-O tool to explore algorithm complexity. Compare O(1), O(log n), O(n), O(n log n), O(n²) and more. Estimate operations for your input size n, see examples, and learn how to read asymptotic notation.

NEC Grounding Electrode Conductor (GEC) Sizing Calculator

Professional NEC Grounding Electrode Conductor (GEC) sizing calculator. Compute minimum copper or aluminum GEC sizes per NEC 2023 Table 250.66, including parallel conductors and electrode-specific caps.

Scientific Calculator

A comprehensive scientific calculator for solving complex mathematical problems.

IQR Calculator – Interquartile Range, Q1, Median, Q3 & Outliers

Calculate the interquartile range (IQR) from your data set. Paste values, get Q1, median, Q3, IQR, and outlier fences (Tukey method). Includes explanation and FAQs.

Zombie Apocalypse Survival Calculator

Determine your chances of survival in a zombie apocalypse with our interactive calculator.

Atbash Cipher Encoder/Decoder – Instant Online Tool

Encode or decode text with the Atbash cipher. Paste your message, get the reversed-alphabet ciphertext instantly. Supports letters, preserves non-letters, shows examples and explains the method.

PSI to atm (Atmospheres) Converter

Instantly convert PSI (Pounds per Square Inch) to atmospheres (atm), bar, kPa, and Torr (mmHg). Our 5-way scientific pressure converter is built for accuracy.

Fathoms to Feet Converter (6 ft & Admiralty 6.08 ft)

Convert fathoms to feet and feet to fathoms. Supports the standard seafaring fathom of 6 ft and the Admiralty fathom of 6.08 ft. Includes reverse calculator, quick table, formulas, and nautical notes.

DNA Ligation Calculator

Calculate DNA ligation efficiencies and molar ratios with our advanced, accessible, and user-friendly DNA Ligation Calculator.

Men's Shoe Size Converter

Convert men

APGAR Score Calculator

Use this APGAR Score Calculator to evaluate the health of newborns immediately after birth.

PSI to Bar Converter

Instantly convert PSI (Pounds per Square Inch) to bar. Our 4-way pressure converter also converts kPa, atm, and bar to PSI for tire pressure and engineering.

Kansas Local Sales Tax Calculator

Calculate Kansas local sales tax instantly with our authoritative and user-friendly calculator, ensuring compliance with state tax regulations.

Side Hustle Profitability Calculator

Calculate the profitability of your side hustle with our comprehensive, easy-to-use calculator.

Millionaire Calculator

Calculate when you

Negative Gearing Calculator (Australia)

Calculate the benefits of negative gearing on your investments with this authoritative and accessible tool.

Franking Credits Calculator

Calculate Australian Franking Credits with our interactive tool. Determine gross-up and tax offset from franked dividends efficiently.

HEX Converter & Color Inspector – Hexadecimal to RGB, Decimal, Binary

Free online HEX converter: convert hexadecimal to RGB, decimal, and binary, validate hex color codes, and preview the color. Supports #RRGGBB and shorthand #RGB.

Queuing Theory Calculator (M/M/1) – Performance, Waiting Time, Utilization

Free M/M/1 queuing theory calculator. Enter arrival rate (λ) and service rate (μ) to get utilization, L, Lq, W, Wq, probability system is empty, and probability of n customers in the system. Assumptions clearly explained.

Eurocode 6 Masonry Concentrated Load Calculator

Calculate masonry concentrated loads based on Eurocode 6 standards with our interactive tool. Designed for civil engineers.

Fibonacci Retracement Calculator

Calculate Fibonacci retracement levels for trading and investment strategies with our authoritative and interactive calculator.

Phenytoin Level Correction Calculator

Calculate corrected phenytoin levels with an interactive tool based on medical formulas. Developed by Ugo Candido.

Capital Structure Optimization Calculator

Optimize your company

Business Valuation Calculator — Value by DCF, Multiples & Asset-Based

Estimate your small business value using DCF, market multiples (SDE/EBITDA/Revenue), and asset-based methods. Get a weighted range, risk adjustments, charts, and an audit-ready methodology.

Magnification Calculator

Calculate the magnification of lenses easily with the Magnification Calculator. Perfect for students and professionals in optics.

Steps to Miles Calculator (with stride presets)

Convert steps to miles instantly. Enter your steps and pick a stride length (female, male, custom) to see miles, kilometers, and calories burned estimates. Includes formulas, table, and FAQ.

Op-Amp Calculator

Calculate the gain of an operational amplifier using our precise and accessible Op-Amp Calculator.

de Broglie Wavelength Calculator

Calculate the de Broglie wavelength of a particle given its mass and velocity.

Spring Rate Calculator | Mechanical Engineering Tool

Professional spring rate calculator for engineers and enthusiasts. Compute coil spring rate from geometry and material, derive rate from load/deflection, and estimate wheel rate with motion ratio and angle. WCAG 2.1 AA accessible and mobile-first.

Fuel Injector Size Calculator - lb/hr & cc/min

Calculate the required fuel injector size (lb/hr and cc/min) for your engine. Input horsepower, BSFC, cylinder count, and duty cycle for precise results.

Wordle Solver

Effortlessly solve Wordle puzzles with our advanced Wordle Solver tool. Analyze potential word matches and improve your game strategy.

SOFA Score Calculator

Calculate the Sequential Organ Failure Assessment (SOFA) score with our interactive tool, designed for healthcare professionals.

Wallpaper Calculator

Effortlessly calculate the amount of wallpaper needed for your project with our interactive Wallpaper Calculator.

Momentum Calculator | Science › Physics

Professional momentum calculator for physics. Compute linear momentum (classical and relativistic), and 1D two‑body collision outcomes (elastic, inelastic) with accessible, mobile‑first UX.

Taxable vs. Tax-Advantaged Investment Calculator

Compare taxable and tax-advantaged investment outcomes with this interactive calculator to optimize your investment strategy.

Capital Gains Harvesting Calculator

Calculate your potential tax savings with our Capital Gains Harvesting Calculator, designed for investors to optimize their tax strategies.

Cement Calculator - Calculate Cement, Sand, Stone & Bags

Calculate the exact amount of cement, sand, stone, and pre-mix concrete bags needed for your slab, footer, or column. Includes mix ratios and volume calculation.

Concrete Block (CMU) Wall Calculator

Professional-grade CMU block wall calculator. Estimate the number of concrete blocks, courses, mortar, rebar, grout, and caps required for your wall with WCAG-compliant, mobile-first UX.

Z-Score Calculator – Standard Score & Altman Z-Score

Free z-score calculator for statistics and finance. Compute standard score from raw data, mean and standard deviation, get percentile and probability, or calculate Altman Z-score to assess business bankruptcy risk.

Bodybuilding Macro Calculator

Calculate your bodybuilding macros with precision. Plan your protein, fat, and carb intake for optimal performance and muscle gain.

Steel Base Plate Design Calculator (AISC)

Calculate steel base plate design using AISC specifications. Ideal for civil and structural engineers looking for precise, authoritative results.

EPF Calculator

Calculate your projected EPF balance at retirement with our interactive Employees

Steel Joist (K, LH, DLH) Design Calculator

Use our advanced steel joist design calculator to accurately design K, LH, and DLH joists for construction projects.

Atterberg Limits Calculator

Calculate the Atterberg limits for soil classification with this professional-grade tool.

Wilcoxon Signed-Rank Test Calculator (Paired, Nonparametric)

Free Wilcoxon signed-rank test calculator. Enter paired data (before/after) to test median difference, see W+, W−, T, exact p-value (for small samples) or normal approximation, plus assumptions and interpretation.

Sand Calculator | Construction Materials

Professional sand calculator for construction. Compute sand volume, weight, and number of bags for rectangular or circular areas with compaction allowance, density options, and metric/imperial units.

555 Timer Calculator

Calculate the timing intervals of a 555 Timer, in astable mode with this professional-grade tool. Perfect for electronics engineers and hobbyists.

TIMI Risk Score Calculator

Calculate the TIMI Risk Score for assessing the risk of adverse cardiac events in patients with unstable angina or NSTEMI.

Heart Rate Calculator – Target Zones, HRmax & Karvonen (HRR)

Calculate your target heart rate zones using multiple HRmax formulas (Fox, Tanaka, HUNT, Gulati for women) and the Karvonen method (HRR). Includes step-by-step example, formulas in LaTeX, accessible UI, and expert guidance.

Debt Avalanche Calculator — Optimize Your Debt Payoff Order & Save Interest

Use our Debt Avalanche Calculator to prioritize high-APR balances, minimize total interest, and estimate your exact debt-free date. Add multiple debts, set minimums, and apply extra payments.

Travel Budget Calculator

Calculate your travel budget with ease. Our tool helps you plan expenses for a smooth and enjoyable trip.

Pavement Design (AASHTO 1993) Calculator

Calculate pavement design using the AASHTO 1993 guidelines. This tool helps civil engineers in transportation with accurate pavement design calculations.

Men's Shirt Size Converter

Convert men

Chi-Square Test Calculator

Use our Chi-Square Test Calculator to determine statistical significance using the chi-square test method. Ideal for data analysts and researchers.

Corrected QT Interval (QTc) Calculator

Use our QTc calculator to accurately determine the corrected QT interval based on heart rate. Essential for medical professionals to assess cardiac health.

Water Intake Calculator | Health & Fitness Nutrition Tool

Water intake calculator for adults based on authoritative guidelines. Get your personalized daily water target including exercise adjustments.

Calories to Joules (cal to J) Converter

Instantly convert calories (cal) to joules (J) and kilocalories (kcal / food Calories). Our 3-way energy converter is built for science and nutrition.

Photography Depth of Field (DoF) Calculator

Calculate the Depth of Field for your photography with our advanced DoF Calculator. Perfect for photographers of all levels to enhance their focus.

Bolt Torque Calculator (Metric & Imperial) | Tightening Torque for Bolts

Bolt torque calculator to estimate the tightening torque of metric and imperial bolts based on size, grade and lubrication. Includes formula, conversion (Nm, ft-lb, in-lb) and FAQ.

Dog Chocolate Toxicity Calculator

Calculate potential chocolate toxicity in dogs using our precise tool. Input your dog

van't Hoff Factor Calculator

Calculate the van

Customer Acquisition Cost (CAC) Calculator

Calculate your Customer Acquisition Cost (CAC) efficiently with our advanced, accessible, mobile-friendly calculator designed for marketing professionals.

Agency Cost Calculator

Calculate your agency costs with our interactive and accessible agency cost calculator. Ideal for corporate finance needs.

Six Sigma Calculator (DPMO)

Calculate Defects Per Million Opportunities (DPMO) using our interactive Six Sigma calculator. Enhance your business operations and streamline efficiency.

Load Balancing Algorithm Simulator | Ugo Candido

Simulate and understand load balancing algorithms with this interactive tool, developed for engineers and software professionals.

Estate Tax Calculator

Calculate your potential estate tax liability with our precise and user-friendly estate tax calculator.

ft lb to Nm Converter (foot-pounds ↔ newton-meters)

Convert foot-pounds (ft·lb) to newton-meters (N·m) instantly, and back. Uses the precise factor 1 ft·lb = 1.3558179 N·m. Includes reverse N·m to ft·lb, in·lb helper, formula, quick table, and FAQ.

Carat to Grams Converter | ct to g (1 carat = 0.2 g)

Convert carat (ct) to grams (g) instantly. Uses the standard metric carat: 1 ct = 0.2 g. Includes reverse grams to carats, decimal control, jewelry-friendly presets, and quick reference table.

Player Efficiency Rating (PER) Calculator

Calculate the Player Efficiency Rating (PER) for basketball players with our comprehensive and accessible tool.

Friendship Calculator

Calculate the strength of your friendship with our interactive Friendship Calculator. Fun and easy for everyone!

Pump Power Calculator

Calculate the power needed for your pump easily with our authoritative and user-friendly Pump Power Calculator.

Intermittent Fasting Calculator

Calculate your intermittent fasting schedule with this interactive tool. Optimized for health and fitness enthusiasts.

Fahrenheit to Celsius (°F to °C) Converter

Instantly convert Fahrenheit (°F) to Celsius (°C) and Kelvin (K) with our all-in-one temperature converter. See the step-by-step formula and mental math tricks.

Square Miles to Square Kilometers Converter (mi² → km²)

Convert square miles to square kilometers (mi² to km²) and back. Uses the exact factor 1 square mile = 2.58998811 square kilometers. Includes reverse converter, quick table, formulas, and FAQ.

Cash-Secured Put Calculator

Calculate potential profits and losses for cash-secured puts with our interactive tool. A must for traders and investors in options trading.

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Core Math & Algebra | Linear Equations, Quadratics, Slopes

Interactive core math & algebra hub: solve linear equations, factor and solve quadratics, find slope and line equations, and review key formulas. Built for students following Common Core algebra topics.

Loan Amortization Schedule Calculator - Monthly Payment & Interest Breakdown

Calculate your loan amortization schedule with monthly payment breakdown. See principal, interest, and balance for each payment plus total interest costs.

Asphalt Calculator | Construction Materials Tonnage, Volume and Cost

Professional asphalt calculator to estimate hot-mix asphalt (HMA) volume, weight (tons/tonnes), truckloads, and cost. Supports US/Metric units, area or dimensions, thickness, density, waste factor, and live validation.

Safety Stock Calculator

Calculate your safety stock effortlessly with our Safety Stock Calculator. Optimize your logistics and supply chain operations efficiently.

Mastermind Code Breaker

An advanced Mastermind solver tool designed to help you crack the code efficiently with optimal guesses.

Blasting Vibration Calculator

Advanced tool to calculate blasting vibration levels in construction. Accurate, authoritative, and user-friendly calculator following industry standards.

Grams to Pounds Converter | g to lb (and oz)

Convert grams to pounds (and ounces) instantly using the exact factor 1 lb = 453.59237 g. Enter grams to get pounds, decimal control, plus reverse pounds to grams. Perfect for cooking, nutrition, and shipping.

Schwarzschild Radius Calculator

Calculate the Schwarzschild radius of a black hole based on mass. An authoritative tool for astrophysics enthusiasts and professionals.

Moment of Inertia Calculator

Calculate the moment of inertia for various shapes with our advanced calculator, designed for engineers and physicists.

Minimum Spanning Tree (Prim's Algorithm) Calculator

Calculate Minimum Spanning Tree using Prim

Age-Grade Calculator

Use our Age-Grade Calculator to assess your running performance against global standards. Perfect for runners of all levels aiming to measure their fitness.

Solar Position Calculator

Calculate the solar position with precision using our advanced tool. Ideal for scientists and researchers interested in Earth

Liters to Gallons (L to gal) Converter

Instantly convert liters (L) to gallons (gal). Our bidirectional tool handles US Gallons, UK (Imperial) Gallons, milliliters, quarts, pints, cups, and fluid ounces.

Loan Payment (Amortization) Formula Calculator

Calculate monthly loan payments using the amortization formula with our precise and accessible tool.

Louisiana State Income Tax Calculator

Use this Louisiana income tax calculator to estimate your 2024–2025 state income tax, effective and marginal rates. Mobile-first, WCAG 2.1 AA accessible tool with authoritative methodology.

Factoring Calculator | Algebra Tool for Integers and Polynomials

Free factoring calculator for integers and polynomials. Prime factorization, GCD extraction, difference of squares, sum/difference of cubes, and rational roots with step-by-step explanations.

Glulam Beam Design Calculator (AWC/NDS)

A comprehensive Glulam Beam Design Calculator aligned with AWC/NDS standards, designed for construction professionals.

Synergy Value Calculator

Calculate the synergy value in mergers and acquisitions with our authoritative, user-friendly tool.

Fiber Calculator: Recommended Daily Intake

Calculate your recommended daily fiber intake (Adequate Intake) based on official guidelines from the National Academies of Sciences. Uses age, sex, and life stage.

Sales Funnel Conversion Rate Calculator

Calculate your sales funnel conversion rate with our interactive tool. Optimize your marketing and sales strategies.

Colorado State Income Tax Calculator | Authoritative, Accessible & Fast

Use our Colorado income tax calculator to estimate your 2024–2025 state tax. Mobile-first, WCAG-compliant tool with clear methodology, formulas, and FAQs.

Emergency Fund Calculator

Calculate your ideal emergency fund based on your monthly expenses and living situation.

Bike Gear Calculator | Health and Fitness

Calculate the optimal bike gear ratio for your cycling needs with our interactive tool. Perfect for cyclists striving for performance improvement.

Nanometers to Meters (nm to m) Converter

Instantly convert nanometers (nm) to meters (m), micrometers (µm), millimeters (mm), and angstroms (Å). Our 5-way scientific scale converter is built for accuracy.

Penn State Equation Calculator

Calculate nutritional requirements using the Penn State Equation. A tool for healthcare professionals and nutritionists.

Weighted Average Cost of Capital (WACC) Calculator

Calculate the Weighted Average Cost of Capital (WACC) with our professional-grade tool. Understand key corporate finance ratios for better decision making.

Wins Above Replacement (WAR) Calculator

Calculate the Wins Above Replacement (WAR) for baseball players with our interactive and accessible tool.

Luminosity Calculator

An authoritative interactive tool for calculating the luminosity of celestial bodies based on astrophysical formulas.

Tennis Elo Rating Calculator

Calculate and understand your Tennis Elo Rating with our interactive calculator, designed for players and enthusiasts to track performance improvements effectively.

Biorhythm Calculator | Everyday Life

Calculate your biorhythms with our intuitive and accessible tool. Discover your physical, emotional, and intellectual cycles today.

Weight Watchers Points Calculator

Calculate your Weight Watchers Points with our easy-to-use calculator. Stay on track with your nutrition goals effortlessly.

Electron Configuration Calculator

Calculate the electron configuration for any element on the periodic table with our precise, intuitive calculator.

Oregon State Income Tax Calculator

Professional Oregon income tax calculator. Estimate Oregon state income tax (2023), personal exemption credits, and optional local Metro/Multnomah taxes with an accessible, mobile-first tool.

Pig Latin Translator

Translate English into Pig Latin with our advanced, interactive tool, ensuring accessibility and high performance.

Debt-to-Income (DTI) Ratio Calculator | Finance › Loans & Debt

Compute your back-end and front-end DTI, classify risk, and estimate the maximum affordable new payment against a chosen DTI limit.

AISC 360 Steel Design Calculators | CalcDomain

Member strength, stability, slenderness, and connection checks (ASD/LRFD).

Celsius to Kelvin (°C to K) Converter

Instantly convert Celsius (°C) to Kelvin (K) and Fahrenheit (°F) with our all-in-one temperature converter. See the step-by-step formula and calculation.

Body Adiposity Index (BAI) Calculator

Calculate your Body Adiposity Index (BAI) to understand body fat percentage. Ideal for health enthusiasts and medical diagnostics.

Gardening Calculator – Soil Volume, Plant Count, Mulch & Bags

All-in-one gardening calculator: soil volume for beds and planters, plant counts by spacing (square or hex packing), mulch depth, and bag estimates. Perfect for raised beds and square-foot gardening.

Asset Allocation Calculator

Optimize your investment strategy with our Asset Allocation Calculator. Tailored for savvy investors to balance risk and reward effectively.

Parallelogram Calculator: Area, Perimeter, Height, Angles & Diagonals | CalcDomain

Free parallelogram calculator that finds area, perimeter, height, diagonals and angles from multiple input sets: base & height, sides & angle, or diagonals & angle. Includes formulas, special-case detection (rectangle, rhombus) and FAQs.

Cord to Cubic Feet Converter (firewood 4×4×8)

Convert cords of firewood to cubic feet and back. Uses the standard full cord of 128 cubic feet, plus options for face cord and 1/3 cord. Includes formulas, explanation, and quick table.

Settlement Calculator (Consolidation)

Calculate soil consolidation settlement with our comprehensive tool, designed for engineering professionals.

Contribution Margin Calculator - Calculate CM & Ratio

Calculate contribution margin (CM) and CM ratio by entering sales revenue and variable costs. Understand your per-unit profitability and make smarter pricing decisions.

Hogshead to Gallons Converter (US & Imperial)

Convert hogsheads to gallons (US) and gallons (imperial). Supports the common US wine hogshead of 63 US gallons and the British wine hogshead of 52.5 imperial gallons. Includes reverse converter, tables, definitions, and FAQ.

Discriminant Calculator & Quadratic Solver | CalcDomain

Calculate the discriminant (b² - 4ac) of a quadratic equation. Determine the number and type of roots (real or complex). Includes step-by-step solution.

Learning Curve Calculator – Time per Unit, Cumulative Average, Slope

Use this free learning curve calculator to estimate time per unit, cumulative average time, and total hours as production increases. Enter initial unit time and learning rate (e.g. 85%) to model manufacturing or service processes.

Oklahoma State Income Tax Calculator | CalcDomain

Authoritative Oklahoma income tax calculator. Estimate your annual and per‑paycheck Oklahoma state income tax for 2024 with transparent formulas, WCAG-accessible UI, and expert methodology.

UK Income Tax Calculator (Scotland) | Precise 2024/25 Tool

Scotland tax calculator for 2024/25. Estimate Scottish income tax with band-by-band breakdown, personal allowance tapering, pension and Gift Aid adjustments. WCAG-compliant, mobile-first, fast.

Sit-Up Test Calculator

Calculate your sit-up test results with our accurate and accessible Sit-Up Test Calculator.

Savings Calculator | CalcDomain

Professional savings calculator: project your future value with compound interest, recurring contributions, and inflation adjustment. Mobile-first, accessible, and accurate.

HTML Entity Encoder/Decoder

Encode or decode HTML entities with ease using our advanced HTML Entity Encoder/Decoder. Fully compliant with WCAG 2.1 AA for accessibility.

Fuel Economy Converter (MPG, L/100km, km/L)

Convert fuel economy between MPG, L/100km, and km/L with our accurate and user-friendly tool.

Pump Sizing Calculator | Engineering

Calculate the optimal pump size for your needs with our authoritative pump sizing calculator.

Army Physical Fitness Test (APFT) Score Calculator

Calculate your APFT score with our interactive and accessible tool. Optimized for performance and mobile-first design.

Rods to Feet Converter | 1 rod = 16.5 feet

Convert rods to feet (and feet to rods) using the standard survey factor 1 rod = 16.5 feet. Includes reverse converter, quick table, formulas, and historic notes on rods, poles, and perches.

Miles to Kilometers (mi to km) Converter

Instantly convert miles (mi) to kilometers (km) and mph to kph. Our bidirectional tool is perfect for distance and speed, with mental math tricks and charts.

CAP Theorem Visualizer

Explore the intricacies of the CAP Theorem with our interactive calculator, designed for software engineers and system architects to understand trade-offs in distributed systems.

Aquarium Stocking Calculator

Calculate optimal fish stocking levels for your aquarium with our advanced calculator. Ensure a healthy environment for your aquatic life.

Reverse Mortgage Calculator

Calculate potential reverse mortgage outcomes with our authoritative and accessible Reverse Mortgage Calculator.

Real Estate Development Feasibility Calculator

Evaluate the feasibility of real estate development projects with this comprehensive, interactive calculator.

Net Promoter Score (NPS) Calculator

Calculate your Net Promoter Score (NPS) with our interactive and accessible tool. Ideal for marketing and sales professionals.

Vertical Curve Calculator | Engineering Tool

Calculate vertical curves for civil engineering projects with precision and ease using our interactive vertical curve calculator.

Micropile Design Calculator

An advanced micropile design calculator for construction professionals, based on authoritative engineering data.

Law of Cosines Calculator (SSS and SAS Triangle Solver) | CalcDomain

Calculate missing sides and angles of any triangle using the Law of Cosines. Solves SSS (Side-Side-Side) and SAS (Side-Angle-Side) cases with step-by-step results.

Meters to Feet (m to ft) Converter

Instantly convert meters (m) to feet (ft) and inches (in), or centimeters (cm) to feet. Our bidirectional height and length converter is built for accuracy.

Satellite Orbit Calculator

An interactive Satellite Orbit Calculator designed for aerospace engineers to calculate satellite orbits with precision.

Alberta Provincial Tax Calculator

Calculate your Alberta provincial taxes with our interactive tax calculator. Get detailed insights based on the latest tax rates.

Mulch Calculator | Professional Landscaping Volume, Bags, and Cost

Mulch calculator to estimate mulch volume, number of bags, and cost for any garden bed. Supports imperial and metric units, multiple area shapes, and WCAG 2.1 AA accessible design.

Two-Way ANOVA Calculator (with Interaction) – Factorial Analysis

Free two-way ANOVA calculator with interaction. Enter number of levels and replications, fill the data grid, and get SS, df, MS, F and p-values for factors A, B and AxB, plus assumptions and interpretation.

Cash on Cash Return Calculator

Calculate cash on cash return for real estate investments with our interactive and accessible tool.

Multiple Linear Regression Calculator – OLS, ANOVA, Predictions

Free multiple linear regression calculator. Paste your dataset, choose the number of predictors, and get OLS coefficients, standard errors, t-statistics, p-values, ANOVA table, R², adjusted R², and prediction for new values.

Cochran's Q Test Calculator – 3+ Related Proportions (Binary)

Free Cochran

Currency Converter | Accurate, Accessible, Fast

Professional-grade currency converter using authoritative ECB reference rates. Convert between 30+ currencies, factor provider fees, and view historical rates.

Roof Pitch Calculator | Framing & Roofing | CalcDomain

Professional roof pitch calculator. Convert between pitch (in-12), angle (degrees), slope (%), and rise:run. Compute rafter length and actual rise from any input method. WCAG 2.1 AA accessible and mobile-first.

Margin of Error Calculator – Proportions, Means, & Sample Size

Free margin of error calculator for surveys and statistics. Compute margin of error for proportions or means, apply finite population correction, and estimate the sample size needed at a chosen confidence level.

Sector Area Calculator: Area, Arc Length, Perimeter from Radius & Angle | CalcDomain

Sector area calculator that finds the area of a circle sector, arc length, central angle in degrees or radians, and sector perimeter. Supports radius + angle, diameter + angle, arc length + radius, and percentage of circle.

Primer Design Calculator (Tm)

Calculate the melting temperature (Tm) of your DNA primers accurately with our advanced Primer Design Calculator.

Decimal Calculator: Rounding, Fraction & Percentage Conversion | CalcDomain

Master decimals with our multi-function calculator. Easily round any decimal number, convert it to a fraction or percentage, and see the step-by-step math.

Mark-Recapture (Lincoln-Petersen) Calculator

Calculate population estimates using the Mark-Recapture (Lincoln-Petersen) method. This tool is designed for advanced life science applications.

Series Calculator: Arithmetic, Geometric, Sigma Notation & Custom Sum | CalcDomain

Free series calculator. Sum arithmetic series, geometric series (finite or infinite), custom lists of terms, and sigma notation with n. Shows formulas and steps.

Minnesota State Income Tax Calculator

Minnesota income tax calculator: estimate your Minnesota state income tax for 2023–2024. Supports filing status, standard vs. itemized deductions, and a detailed bracket-by-bracket breakdown.

Car Payment Calculator - Estimate Monthly Auto Loan Costs

Estimate your monthly car payment, total interest, and total loan cost. Our accessible, mobile-first calculator accounts for vehicle price, down payment, trade-in, sales tax, and fees.

Virginia State Income Tax Calculator | 2024–2025 Estimate

Estimate your Virginia state income tax in seconds. Calculate taxable income, annual tax due, marginal and average tax rates, and per‑paycheck withholding for 2024–2025 with an accessible, mobile-first calculator.

Clausius-Clapeyron Equation Calculator

Calculate phase transitions using the Clausius-Clapeyron equation. Ideal for advanced chemistry and science applications.

Pallet Loading Calculator

Optimize your logistics with our interactive Pallet Loading Calculator. Efficiently calculate the number of items per pallet and maximize your storage space.

What is My Patronus? Calculator

Discover your magical Patronus with our interactive Patronus Calculator, inspired by the Harry Potter universe.

Manitoba Provincial Tax Calculator

Calculate your Manitoba provincial tax with ease using our authoritative and accessible tax calculator.

Critical Swim Speed (CSS) Calculator

Calculate your Critical Swim Speed (CSS) to improve your swimming performance. This tool is designed for swimmers seeking to optimize their training and swimming efficiency.

Wedding Flower Calculator

Calculate your wedding flower budget with our authoritative Wedding Flower Calculator. Ensure a beautiful wedding without overspending.

Teaspoons to Tablespoons Converter | CalcDomain

Convert teaspoons to tablespoons quickly and easily with our authoritative cooking conversion tool. Perfect for baking and cooking recipes.

German Church Tax (Kirchensteuer) Calculator

Authoritative church tax calculator Germany. Instantly compute Kirchensteuer at 8% or 9% for all German states using your assessed income tax or a quick estimate. Includes optional cap (Kappung) and capital gains module.

Ideal Gas Law Calculator | Science » Chemistry

Ideal gas law calculator (PV = nRT) with multi-unit support. Solve for pressure, volume, moles, or temperature. WCAG-accessible, mobile-first, and optimized for performance.

Grams to Moles Calculator (and Moles to Grams)

Convert grams to moles fast: enter mass in grams and molar mass (g/mol) to get moles. Includes reverse moles to grams, sample substances, formulas, and chemistry notes.

Navy Physical Readiness Test (PRT) Score Calculator

Calculate your Navy Physical Readiness Test (PRT) score with our interactive tool. Ensure you

Formwork Pressure Calculator (ACI 347)

Advanced calculator for determining formwork pressure in construction according to ACI 347 standards.

Slugging Percentage Calculator

Calculate your baseball slugging percentage with our precise and user-friendly tool. Perfect for players and coaches alike.

Intercept Calculator - Find X and Y Intercepts Online | Free Tool

Calculate x-intercept and y-intercept instantly from any linear equation. Supports slope-intercept, standard form, point-slope, and two points. Free graphing tool with step-by-step solutions.

Pile Capacity Calculator

An authoritative pile capacity calculator for civil engineering professionals to evaluate foundation capacities accurately.

Perimeter Calculator (Rectangle, Square, Triangle, Circle, Polygon)

Free perimeter calculator for common 2D shapes: rectangle, square, triangle, circle and regular/irregular polygons. Enter side lengths in mm, cm, m or inches and get instant perimeter. Includes formulas and FAQ.

TFSA (Tax-Free Savings Account) Calculator

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Financial Goals Calculator

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eDPI Calculator

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Integral Calculator – Numerical Definite Integrals of Real Functions

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Substitution Cipher Solver — Simple Substitution Decoder

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House Affordability Calculator | How much house can I afford?

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Nanometers to Meters Converter (nm → m)

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ROT13 Cipher Encoder / Decoder – Instant Text Converter

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Colorado Local Sales Tax Calculator

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Project Layout & Design — Concrete Slab Calculator

Calculate concrete volume, bag counts, weight, rebar/mesh, and cost for slab-on-ground projects. Mobile-first, WCAG-compliant calculator for contractors and homeowners.

US State & Local Taxes | CalcDomain Finance

Quick links to US state income tax calculators and major local taxes and sales taxes.

UK Capital Gains Tax (CGT) Calculator | Accurate 2022/23–2024/25 | CalcDomain

Capital Gains Tax Calculator UK. Estimate CGT on residential property and other assets for the 2022/23, 2023/24, and 2024/25 tax years. Mobile-first, WCAG AA accessible, and based on HMRC guidance.

Dream Interpretation Calculator

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Arc Length Calculator (Degrees & Radians) | CalcDomain

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NIH Stroke Scale (NIHSS) Calculator

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Home Insurance Estimator

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Gabion Wall Design Calculator

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Special Relativity Calculator (Lorentz Factor)

Interactive Lorentz Factor Calculator to explore concepts of special relativity, ideal for physics enthusiasts and students.

Potential Energy Calculator | Physics Tool for Gravitational and Elastic Energy

Professional potential energy calculator for physics. Compute gravitational potential energy (m·g·h and −G·m1·m2/r) and elastic spring energy (½·k·x²) with precise unit conversions. Fully accessible, mobile‑first, and optimized for performance.

Add/Subtract Days from a Date Calculator | CalcDomain

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Fibonacci Number Calculator – Compute the n-th Fibonacci & Sequence

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Pressure Calculator | Science Physics Tool

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Land Transaction Tax (LTT) Calculator (Wales)

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Equipment Loan Calculator - Estimate Payments, Interest & Total Cost

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PSI to Pascals (Pa) Converter

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Nyquist Plot Calculator

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Nanometers to Micrometers (nm to µm) Converter

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D&D Character Name Generator

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Credit Rating Model Calculator (Z-Score)

Advanced interactive calculator for estimating Z-Score credit ratings, essential for corporate finance analysis.

GST Calculator Australia

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Relativistic Velocity Addition Calculator

Calculate relativistic velocity addition with ease using our interactive, accessible, and mobile-friendly tool based on Einstein

Wisconsin State Income Tax Calculator

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Strike Water Temperature Calculator for Homebrewing | CalcDomain

Professional strike water temperature calculator for homebrewing. Calculate precise strike water temp using proven heat-balance formulas with optional mash tun thermal mass adjustment.

Ellipse Area Calculator – Area of an Ellipse from Axes & Diameter

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ACI 318 Concrete Column Design Calculator

Professional ACI 318 concrete column design calculator. Check axial and biaxial capacities using a simplified Bresler interaction per ACI 318 with clear UX, accessibility (WCAG 2.1 AA), and mobile-first performance.

Hours Calculator - Calculate Time Duration & Add/Subtract Time

Calculate the duration in hours, minutes, and seconds between two times. You can also add or subtract hours and minutes from a specific time.

SOHCAHTOA Calculator – Sine, Cosine, Tangent & Right Triangle Solver

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Gallons per Minute (GPM) to Liters per Second Converter

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Clothing Size Converter (International)

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Wheatstone Bridge Calculator

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Metric Tons to Pounds Converter

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Yards to Meters (yd to m) Converter

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UTM Coordinate Converter

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NEC Box Fill Calculator

Professional NEC Box Fill Calculator for US electricians. Compute required box volume per NEC 314.16(B) with device yokes, grounds, clamps, and fittings. Mobile-first, accessible, and optimized for Core Web Vitals.

Benzodiazepine Conversion Calculator

Use this authoritative Benzodiazepine Conversion Calculator to accurately convert doses between various benzodiazepines.

Social Security Break-Even Calculator

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Eurocode 9 Aluminum Beam Design Calculator

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Startup Costs Calculator

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Loans & Debt | CalcDomain Finance

Loan calculators for payments, amortization, payoff strategies, DTI, APR, consolidation, student and credit cards. Transparent, fast, accurate.

Pet Gestation Calculator

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Capital Asset Pricing Model (CAPM) Calculator

Calculate the expected return on investment using the CAPM formula. Perfect for finance professionals and investors.

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Body Fat Calculator - Estimate Your Body Fat Percentage

A free, accessible calculator to estimate body fat percentage (BFP) using the U.S. Navy method or BMI. Includes formulas, health charts, and step-by-step examples.

Waist-to-Hip Ratio Calculator | Health and Fitness Body Metrics

Use our waist to hip ratio calculator to assess body fat distribution and cardiometabolic risk using WHO thresholds. Accurate, accessible, and mobile-friendly.

Cyclomatic Complexity Calculator

Cyclomatic Complexity Calculator: Calculate the cyclomatic complexity of your code to understand its maintainability and potential risk.

Tilt-Up Concrete Wall Design Calculator

An authoritative tool for calculating tilt-up concrete wall design, ensuring structural efficiency and compliance with engineering standards.

Spanish Pension Calculator

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Sales Tax Calculator (by State/Province)

Calculate sales tax for any amount based on U.S. state or Canadian province rates with our authoritative, easy-to-use tool.

KB to MB Converter | Kilobytes to Megabytes (1000 vs 1024)

Convert kilobytes (KB) to megabytes (MB) instantly. Choose decimal (1 MB = 1000 KB) or binary (1 MiB = 1024 KiB), do reverse MB to KB, and see an instant size table.

Neutron Activation Calculator

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Degrees, Minutes, Seconds to Decimal Degrees Converter

Convert angles from degrees, minutes, seconds to decimal degrees with our interactive and accessible online tool.

Square Meters to Square Feet (m² to ft²) Converter

Instantly convert square meters (m²) to square feet (ft²). Our area calculator also converts from room dimensions (length x width) and includes square yards and acres.

Derivative Calculator – Numerical Derivative of Functions at a Point and on an Interval

Compute numerical derivatives of real-valued functions. Approximate f

Receivables Turnover Calculator

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Element Information Calculator

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Illinois Local Sales Tax Calculator

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Utah State Income Tax Calculator

Professional, mobile-first Utah income tax calculator. Estimate Utah state income tax by tax year with flat-rate precision, credits, additions/subtractions, and pay-period support.

Business Operations Calculators | CalcDomain - Project, HR, Supply Chain & Strategy

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Osmolality Calculator

Calculate serum osmolality accurately with our advanced tool, designed for health professionals and nutrition experts.

Income Tax Calculator - Progressive Tax Brackets

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Credit Card Number Validator (Luhn Algorithm)

Use our interactive Luhn Algorithm calculator to validate your credit card numbers efficiently and securely.

Ecological Footprint Calculator

Calculate your ecological footprint to understand your impact on the environment with our comprehensive calculator.

Concrete Compressive Strength Estimator | ConcreteCalculator.Tools

Professional concrete strength calculator. Estimate 28‑day compressive strength from water‑cement ratio (w/c), or find the required w/c for a target f

Watts to Horsepower Converter – W to hp and hp to W

Convert power between watts (W) and mechanical horsepower (hp).

Pediatric BMI Percentile Calculator

Calculate the pediatric BMI percentile to assess children

Office Space Calculator

Calculate your office space needs with our interactive Office Space Calculator, designed for businesses to optimize their workspace efficiently.

Flash Distillation Calculator

Advanced flash distillation calculator for chemical engineering professionals. Calculate with precision and ease.

ACI 318 Reinforcement Development Length Calculator (Tension)

Professional, WCAG-compliant calculator for rebar development length in tension per ACI 318. Includes epoxy, top-bar, size, confinement and lightweight modifiers with SI/Imperial units.

Ring Size Converter

Convert ring sizes between different countries and metrics with our interactive Ring Size Converter.

Auto Lease Calculator | Finance — Personal Loans

Professional-grade auto lease calculator. Estimate monthly lease payment, depreciation, finance charge, taxes, due at signing, and total lease cost. WCAG 2.1 AA accessible and mobile-first.

Antenna Design Calculator

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Flow Rate Converter (Volume) | Conversions Flow Rate

Professional volume flow rate converter. Convert between m³/s, m³/h, L/s, L/min, US gpm, Imperial gpm, ft³/s, CFM, and more. Includes reverse conversion, formulas, quick tables, and FAQs.

Time Dilation Calculator | CalcDomain

Accurately calculate time dilation based on Einstein

North Carolina State Income Tax Calculator

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Ideal Weight Calculator — Devine, Hamwi, Robinson, Miller & BMI Range

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Churn Rate Calculator | CalcDomain

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Decimal Degrees to Degrees, Minutes, Seconds Converter

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Rectangle Area Calculator: Length, Width, Perimeter & Diagonal | CalcDomain

Free rectangle area calculator. Enter length and width, or work backwards from perimeter or diagonal to find area, perimeter, diagonal, aspect ratio and optional cost. Includes formulas and FAQs.

Adsorption Isotherm Calculator (Langmuir, Freundlich)

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Room Mode Calculator

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On-Base Percentage (OBP) Calculator

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Eurocode 7 Retaining Wall Stability Calculator

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HECS Debt Calculator

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LED Resistor Calculator

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Prism Calculator (Volume & Surface Area) - Rectangular & Triangular | CalcDomain

Calculate the Volume and Total Surface Area of rectangular prisms and triangular prisms. Uses the universal prism formula: $V = B \cdot h$. Includes step-by-step solutions.

Roods to Acres Converter

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Medicare Tax Calculator | US Federal Tax | CalcDomain

Professional Medicare Tax Calculator for the United States. Estimate employee and employer Medicare tax, the 0.9% Additional Medicare Tax, and your potential balance due by filing status. Mobile-first, WCAG-compliant, and fast.

Nebraska State Income Tax Calculator

Nebraska income tax calculator for 2024. Estimate your Nebraska state income tax by filing status and taxable income. Mobile-first, WCAG 2.1 AA accessible, and optimized for Core Web Vitals.

Montana State Income Tax Calculator | 2024–2025 Accurate & Accessible Tool

Montana income tax calculator for tax years 2024–2025. Instant results with effective and marginal rate, bracket breakdown, and WCAG 2.1 AA accessible UX.

About Ugo Candido, MBA | CalcDomain

Meet Ugo Candido, a strategic business consultant specializing in regulatory compliance and organizational excellence, and explore the professional tools he has developed.

Salary Sacrifice Calculator (UK)

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Caching Strategy Calculator

Interactive tool for calculating optimal caching strategies for software engineering, ensuring high performance and efficient data management.

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Pipe Sizing Calculator (for Water)

Calculate the optimal pipe size for water velocity to ensure efficiency and safety in mechanical engineering projects.

Greenhouse Gas Warming Potential (GWP) Calculator

Calculate the global warming potential of different greenhouse gases with our GWP calculator.

Annuity Calculator: Future Value & Payout Planning

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Measurement Unit Conversions Calculators - 122 Math & Conversions Tools | CalcDomain

Browse 122 measurement unit conversion calculators: speed, pressure, energy, data, historical units, typography, viscosity, radiation, and more.

Open Web Steel Joist (K-Series) Calculator

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Correlation Coefficient Calculator (Pearson's r & R²) | CalcDomain

Calculate Pearson

Factorial Calculator

Calculate the factorial of a number instantly with our user-friendly factorial calculator. Perfect for students, educators, and professionals.

Current Ratio Calculator

Calculate your company

Parkland Formula Calculator (Burns)

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Cap Rate Calculator

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Days Until a Date Calculator

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Acres to Square Feet (ac to ft²) Converter

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Roulette Odds Calculator

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Boat Loan Calculator — Payment, Taxes, Fees & Amortization

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TMS 402/602 Masonry Design Calculators | CalcDomain

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Pile Group Efficiency Calculator

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Cloud Cost Estimator (AWS, Azure, GCP)

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Appointment Calculator – Plan Dates, Business Days, Working Hours

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Halstead Complexity Metrics Calculator

Calculate Halstead complexity metrics for better software analysis.

NFL Draft Value Chart Calculator

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Treadmill Pace Calculator

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Binomial Distribution Calculator

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Bra Size Converter

Convert your bra size between different international standards with our high-quality bra size converter.

Stress and Strain Calculator | Engineering Mechanical

Professional stress and strain calculator: compute engineering stress (σ), strain (ε), and Young’s modulus (E) from force, area, and elongation. Mobile-first, accessible, and optimized for engineers.

Commission Calculator | Finance • Business

Professional commission calculator for sales and real estate. Compute simple, flat+percent, or tiered commissions, apply caps, and split payouts. WCAG 2.1 AA accessible, mobile‑first, and optimized for Core Web Vitals.

Markov Chain Simulator

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Drug Dosage Calculator

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Sortino Ratio Calculator

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Dew Point Calculator

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Crystallizer Design Calculator

Advanced tool for calculating crystallizer design in chemical engineering.

Feet and Inches to Centimeters Converter

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Gear Ratio Calculator | Engineering Mechanical Tool

Professional gear ratio calculator. Compute single or multi‑stage gear ratios, output speed, torque, direction, and overall efficiency. Built for mechanical engineers, makers, and students.

Currency Option Pricing Calculator (Garman-Kohlhagen)

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Cycling Power to Weight Ratio Calculator

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Satellite Link Budget Calculator

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Fill Rate Calculator

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Permutation Calculator: nPr, With & Without Repetition | CalcDomain

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Markup Calculator | Business Finance Tool

Professional-grade markup calculator for businesses. Compute selling price, markup %, profit, and gross margin from cost. Mobile-first, WCAG-accessible, and optimized for Core Web Vitals.

Box and Whisker Plot Generator

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Principal Component Analysis (PCA) Calculator

A professional-grade PCA calculator designed to perform Principal Component Analysis with ease, optimized for accessibility and performance.

Vermont State Income Tax Calculator

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New Jersey State Income Tax Calculator

New Jersey income tax calculator for 2024–2025. Estimate NJ state tax by filing status, dependents, and age/blind exemptions. Clear methodology, WCAG-compliant UI, and per‑paycheck breakdown.

Georgia Local Option Sales Tax (LOST/SPLOST) Calculator

Calculate Georgia

Normal Distribution Calculator – PDF, CDF, Area, Inverse

Normal distribution (Gaussian) calculator. Enter mean and standard deviation to get PDF, CDF, area between two values, and inverse CDF (quantile). Includes formulas and explanations.

Bar to PSI Converter

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Horizontal Curve Calculator

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Series and Sequences Calculator

An authoritative Series and Sequences Calculator designed to solve problems related to mathematical calculus efficiently and accurately.

Equipment Financing Calculator | Calculate Loan Payments

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OPS (On-Base Plus Slugging) Calculator

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Inverse Laplace Transform Calculator

An advanced interactive Inverse Laplace Transform Calculator designed for students and professionals in calculus and engineering.

Law of Sines Calculator (AAS, ASA, SSA Triangle Solver) | CalcDomain

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Diffraction Grating Calculator | Science & Physics

Calculate diffraction angles, orders, and other parameters for diffraction gratings with this interactive tool. Perfect for physics students and professionals.

Cylinder Volume Calculator (Full & Horizontal Tank) | L, m³, ft³, gallons

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Seismic Load Calculator (ASCE 7-16)

Calculate seismic loads using the ASCE 7-16 standard with this interactive tool. Optimized for accuracy and accessibility.

Water Footprint Calculator

Calculate your water footprint to understand your impact on water resources. This tool helps individuals assess their water usage and find ways to conserve water effectively.

Wash Sale Rule Calculator

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Beam Deflection Calculator

Calculate beam deflection for engineering projects. Input parameters to get precise deflection results using standardized formulas.

Prince Edward Island (PEI) Provincial Tax Calculator

Calculate your provincial taxes in Prince Edward Island with our interactive tax calculator.

Knots to MPH & KMH Converter | Nautical Speed Converter

Convert knots to miles per hour (mph) and kilometers per hour (km/h) instantly. Uses standard nautical mile definitions. Includes formulas, quick reference table, and sailing/aviation notes.

Work Calculator | Physics Work (W = F · d · cos θ)

Professional physics Work Calculator. Compute work done by a force using W = F · d · cos θ, with unit conversions (N, lbf, m, ft) and detailed step-by-step breakdown. WCAG-accessible and mobile-first.

Rule of 72 Calculator

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Lbs to Stone Converter (and back) | Weight & Mass

Instantly convert pounds (lb) to stones (st) and stones+lbs. Exact factors, kg equivalents, quick tables, and FAQs.

Geometric Distribution Calculator – PMF, CDF, Mean & Variance

Geometric distribution calculator. Compute probability of first success on the k-th trial or number of failures before first success, plus CDF, mean, and variance. Includes formulas and explanations.

Temperature Converter (°C, °F, K, °R & more) | Conversions

Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and legacy scales (Réaumur, Delisle, Newton, Rømer). Bidirectional, precise, with rounding and quick reference tables.

Segment Calculator: Circle Segment Area, Woodturning Segments & SMS Segments | CalcDomain

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Acceleration Calculator | Science • Physics

Professional acceleration calculator. Compute acceleration from change in velocity and time, from force and mass, or using kinematics equations. Accessible, mobile-first, and optimized for speed.

Glycemic Index and Glycemic Load Calculator

Calculate glycemic index and glycemic load for foods with our comprehensive tool, designed for nutrition enthusiasts and health professionals.

New Mexico State Income Tax Calculator

Authoritative New Mexico income tax calculator for 2024. Estimate your NM state tax by filing status, taxable income, or from gross pay with standard/itemized deductions. Fast, accessible, and mobile-first.

Power Supply Design Calculator

Expert-level tool for designing power supply systems, assisting electrical engineers with precise calculations.

Sample Size Calculator – Surveys, Proportions & Finite Population

Free sample size calculator. Calculate the sample size for surveys (proportions), continuous data (means), and apply finite population correction. Choose confidence level, margin of error, and expected proportion.

Grains to Grams Converter (and back) | Mass & Weight

Instantly convert grains (gr) to grams (g) and grams to grains. Exact factor: 1 grain = 0.06479891 g. Includes mg, quick tables, formulas, and FAQs.

Texas Local Sales Tax Calculator

Calculate Texas local sales tax with our interactive tool. Discover how much sales tax is added to your purchase in Texas.

Louisiana Local Sales Tax Calculator

Calculate Louisiana local sales tax efficiently with our authoritative and accessible tool.

Plate Bending Calculator (FEA)

Advanced Plate Bending Calculator using Finite Element Analysis for civil engineering applications.

Goldbach Conjecture Calculator

Explore the Goldbach Conjecture with our interactive calculator. Compute pairs of prime numbers that sum up to an even number, providing insights into number theory.

ASCE 7-22 Wind Load Calculator (Main Wind-Force Resisting System)

Professional ASCE 7-22 wind load calculator for Main Wind-Force Resisting Systems (MWFRS). Compute velocity pressures (qz, qh) and design pressures with exposure, height, risk category, and coefficients.

Sphere Volume Calculator ($V = \frac{4}{3} \pi r^3$) & Surface Area | CalcDomain

Calculate the Volume and Surface Area of a sphere instantly. Input radius or diameter to get step-by-step solutions for $V = \frac{4}{3} \pi r^3$ and $A = 4 \pi r^2$.

Mohs Hardness Scale Converter – Compare Mineral Hardness Online

Interactive Mohs hardness scale converter. Convert Mohs hardness to relative (absolute) hardness, explore mineral and gemstone hardness, and use the full Mohs scale table for geology, gemology and materials science.

Data Transfer Rate Converter – Convert Network Speeds (bps, Kbps, Mbps, MB/s)

Professional data transfer rate converter. Convert between bps, Kbps, Mbps, Gbps, B/s, KB/s, MB/s and more. Estimate file transfer time from link speed and file size for networking, IT and cloud engineering.

HVAC Tonnage Calculator

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Fantasy Name Generator

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Terms of Service - CalcDomain | User Agreement

CalcDomain Terms of Service. Understand your rights and responsibilities when using our free calculators and tools.

Age Calculator | Everyday Life Time & Date Tool

Professional, accessible Age Calculator that computes your precise age in years, months, days, and more. Mobile-first, WCAG 2.1 AA compliant, and optimized for Core Web Vitals.

Celsius to Fahrenheit (°C to °F) Converter

Instantly convert Celsius (°C) to Fahrenheit (°F) and Kelvin (K) with our all-in-one temperature converter. See the step-by-step formula and mental math tricks.

Capital Gains Tax Calculator (Short-Term) | CalcDomain

Short term capital gains tax calculator for U.S. federal taxes. Instantly see the extra tax on a short-term gain using 2024 IRS ordinary income brackets—effective rate, marginal bracket, and totals.

Newfoundland and Labrador Provincial Tax Calculator

Calculate your Newfoundland and Labrador provincial taxes with our interactive calculator. Ensure accurate tax estimates with our authoritative tool.

Lake Trophic State Index (TSI) Calculator

Calculate the Trophic State Index (TSI) for lakes with precision and ease. Ideal for environmental scientists and researchers.

Light Gauge Steel Framing Calculator

Calculate light gauge steel framing with precision using our advanced calculator. Ideal for construction professionals seeking reliable and accurate measurements.

Mutual Fund Fee Calculator

Calculate the impact of fees on your mutual fund investments with our precise Mutual Fund Fee Calculator.

pH Calculator | Science › Chemistry | CalcDomain

Professional pH calculator for chemistry and water analysis. Compute pH, pOH, [H+], and [OH−] from multiple inputs: direct concentration, strong/weak acids and bases, and buffer solutions with temperature-aware pKw.

Reynolds Number Calculator | Engineering (Mechanical)

Professional Reynolds number calculator for engineers and students. Compute Reynolds number using fluid density and dynamic viscosity or kinematic viscosity, with unit conversions, fluid presets (air, water, oil), and flow regime classification.

Indiana County Income Tax Calculator

Calculate your Indiana county income tax with our easy-to-use online tool. Updated with the latest tax rates for 2024.

True Shooting Percentage (TS%) Calculator

Calculate basketball

Business Valuation Calculator (Multiple Methods)

Accurately estimate your business

Airbnb / Vacation Rental Calculator

Calculate potential earnings from Airbnb or vacation rentals with our comprehensive calculator. Perfect for real estate investors and hosts.

Eurocode 5 Timber Column Design Calculator

Professional Eurocode 5 (EN 1995-1-1) timber column design calculator. Computes design axial compression resistance with buckling about both axes, per EC5 clause 6.3.2. Mobile-first, WCAG 2.1 AA accessible.

Offline - CalcDomain | Professional Calculators

CalcDomain works offline! Access your cached calculators and perform calculations without an internet connection.

Rock Quality Designation (RQD) Calculator

Calculate the Rock Quality Designation (RQD) with ease using our interactive tool, perfect for geologists and engineers.

BMI Calculator | Health & Fitness · Health Metrics

Accurate Body Mass Index (BMI) calculator with metric/imperial units, healthy ranges, and interpretation based on WHO categories. Mobile-first, WCAG 2.1 AA compliant.

Annuity Present Value Calculator

Calculate the present value of an annuity with our precise calculator designed for finance professionals.

Merger & Acquisition (M&A) Model Calculator

Calculate complex M&A scenarios effortlessly with our advanced M&A Model Calculator, designed for corporate finance professionals.

Dog Medication Dosage Calculator

Calculate the correct medication dosage for your dog with our easy-to-use calculator, ensuring the health and safety of your pet.

Overall Equipment Effectiveness (OEE) Calculator

Calculate Overall Equipment Effectiveness (OEE) to optimize manufacturing processes using our precise, user-friendly online tool.

Differential Equation Solver

An authoritative and accessible tool for solving differential equations, ensuring accuracy and ease of use.

Earth Dam Seepage Calculator

Calculate seepage through an earth dam using advanced engineering formulas. Tailored for civil engineers and students to ensure accurate and reliable results.

Subcategory Title | Parent Category | CalcDomain

Describe the calculators included in this subcategory, the pain-points solved, and key differentiators.

Calibration Curve Calculator (Linear Regression)

Create a calibration curve online using linear regression. Input concentration (X) and response (Y) data to find the equation (y=mx+b), R-squared, and calculate unknown sample concentrations.

Newton-meters to Foot-pounds Converter – N·m to ft·lbf and ft·lbf to N·m

Convert torque between newton-meters (N·m) and foot-pounds (ft·lbf).

KiwiSaver Calculator (New Zealand)

Calculate your KiwiSaver savings efficiently with our interactive calculator, designed for New Zealand residents.

Bernoulli's Equation Calculator | CalcDomain

Professional Bernoulli equation calculator for engineers and students. Compute pressure, velocity, or elevation between two points, with head loss, unit conversions, and rigorous accuracy.

Equilateral Triangle Calculator - Find Area, Side, Height

Calculate the area, side length, height, and perimeter of an equilateral triangle from any known value. Includes formulas and a step-by-step example.

Yeast Pitch Rate & Starter Calculator for Homebrewing

Professional yeast pitch rate calculator to determine required cells for ales and lagers, estimate viable cells from packs, and compute one-step starter volume.

ASCE 7-22 Load & Hazard Calculators | CalcDomain

Load combinations, wind (MWFRS & C&C), snow, seismic parameters, tornado loads.

Human Life Value Calculator

Calculate your Human Life Value with precision using our authoritative online tool.

Compton Scattering Calculator

Calculate the Compton scattering effect using our precise and accessible online tool. Perfect for students and professionals in quantum mechanics.

Singular Value Decomposition (SVD) Calculator

Accurately compute Singular Value Decomposition (SVD) for your matrices with our interactive, easy-to-use calculator.

A Body Shape Index (ABSI) Calculator | Health and Fitness

Calculate your A Body Shape Index (ABSI) to understand your health risks based on body metrics.

Balloon Payment Calculator – Regular Payment, Final Balloon, Total Interest

Compute regular payments and the final balloon for a loan with a large amount due at maturity. Get payment, balloon, total interest, and a printable schedule.

Concrete Calculator - Estimate Volume, Bags & Cost

Calculate the volume, number of pre-mix bags, and total cost of concrete needed for slabs, footings, or columns. Includes wastage factor.

PESTLE Analysis Generator

An authoritative PESTLE analysis generator to help businesses strategically analyze their macro-environmental factors.

Total Asset Turnover Calculator

Calculate your company

Population Pyramid Generator

Create and visualize population pyramids with our advanced, user-friendly generator. Optimized for life and earth sciences.

Pediatric Dosage Calculator (by Weight)

Calculate the correct pediatric dosage by weight with our authoritative and accessible online tool.

Detention Pond Sizing Calculator

Calculate the necessary size for a detention pond based on hydrological parameters using our interactive tool.

UK National Insurance Calculator | CalcDomain

Accurately estimate UK National Insurance (NI) contributions for employees (Class 1) and the self‑employed (Class 2 and Class 4) for the 2024/25 tax year. Mobile‑first, accessible, and optimized for speed.

Packed Bed Pressure Drop Calculator (Ergun Equation)

Calculate the pressure drop across a packed bed using the Ergun equation. Ideal for chemical engineers and students.

EMI Calculator

Calculate your Equated Monthly Installment (EMI) for home, car, and personal loans with our authoritative EMI calculator.

Connecticut State Income Tax Calculator

Authoritative Connecticut income tax calculator. Get fast, accessible, and mobile-first estimates of your CT state income tax for 2023 or 2024 by filing status, with marginal and effective rates.

Color Picker & Converter - HEX, RGB, HSL, HSV, CMYK

An interactive color picker tool to select colors and convert between HEX, RGB, HSL, HSV, and CMYK formats. Includes color theory, formulas, and accessibility info.

Exoplanet Transit Calculator

Expert resource for calculating exoplanet transit parameters. Optimized for high performance and accessibility.

Jensen's Alpha Calculator

Calculate Jensen

Meters to Yards (m to yd) Converter

Instantly convert meters (m) to yards (yd), feet (ft), and inches (in). Our bidirectional length converter also includes centimeters (cm) for total accuracy.

Leveraged Buyout (LBO) Model Calculator

Calculate leveraged buyouts effectively with our interactive LBO model calculator, designed for advanced corporate finance analysis.

Cash Flow Statement Calculator

Calculate your business cash flow with ease using our interactive Cash Flow Statement Calculator.

Rhombus Area Calculator

Calculate the area of a rhombus using our interactive tool. Input diagonals or sides and angle to find the solution effortlessly.

Pet Cost Calculator

Calculate the cost of owning a pet with our interactive Pet Cost Calculator. Plan your budget effectively by knowing all expenses involved.

What is My Spirit Animal? Calculator

Discover your spirit animal with our interactive calculator, designed for an engaging and insightful experience.

SWOLF Score Calculator

Calculate your SWOLF score with our precise and user-friendly calculator designed for swimmers looking to enhance their performance.

Military Time Converter

Convert military time to standard time and vice versa with our interactive and accessible Military Time Converter.

Transmission Line Calculator

Advanced transmission line calculator for electrical engineers to compute transmission line parameters with precision.

Grams to Carats Converter | g to ct (1 g = 5 ct)

Convert grams (g) to carats (ct) instantly. Uses the standard metric carat where 1 carat = 0.2 grams, so 1 gram = 5 carats. Includes reverse carats to grams, decimal control, jewelry presets, and a quick reference table.

Framingham Risk Score Calculator

Calculate your cardiovascular risk using the Framingham Risk Score Calculator. A reliable tool for health professionals and patients.

Rocket Engine Performance Calculator

Calculate rocket engine performance parameters with precision using our advanced aerospace calculator.

UK Income Tax Calculator (Wales) | Precise, Accessible, Mobile-First

Authoritative UK Income Tax Calculator for Welsh taxpayers. Model your 2024/25 income tax with support for pension relief, Gift Aid, savings interest, and dividends. WCAG 2.1 AA compliant, fast, and mobile-first.

Bowling Score Calculator

Calculate your bowling score easily with our interactive bowling score calculator. Ideal for beginners and pros alike.

Real Estate IRR Calculator

Advanced Real Estate IRR Calculator for accurate investment analysis. Calculate the Internal Rate of Return for real estate projects with ease.

Dam Stability Calculator

Calculate dam stability with precision using our advanced engineering tool. Ideal for civil engineers seeking reliable analysis.

Infusion Rate Calculator

Calculate the infusion rate with precision using our authoritative Infusion Rate Calculator. Perfect for healthcare professionals and students in pharmacology.

Inches to Centimeters Converter (in to cm) | CalcDomain

Instantly convert inches to centimeters (in to cm) with our free, bidirectional calculator. Supports fractions and provides dynamic conversion charts.

Card Making Calculator — Plan Cuts, Score Lines, Envelopes & Waste

Plan how many cards fit on a sheet, optimal rotation, score and cut guides, bleed and kerf, plus matching envelope sizes. Works with A‑series, US Letter, 12×12 and custom.

Weibull Distribution Calculator

Advanced Weibull Distribution Calculator for statistical analysis. Compute and visualize parameters such as shape, scale, and probability with ease.

Week Number Calculator

Calculate the week number for any given date with our precise and authoritative week number calculator.

Secant Line Calculator — Slope, Equation, Point-Slope, y-Intercept

Secant line calculator for a function f(x) between two points x1 and x2. Enter f(x), choose x1 and x2, and get the secant slope, line equation in point-slope and slope-intercept forms, and function values. Includes formula, explanation, and FAQ.

Eurocode 8 Capacity Design Calculator

Calculate seismic design parameters using Eurocode 8 with our interactive tool, adhering to the latest engineering standards.

Tablespoons to Cups Converter (US, Metric, UK) | CalcDomain

Instantly convert tablespoons to cups. Supports US, metric and UK cup sizes, reverse conversion (cups to tablespoons), partial tablespoons, and a handy reference table for cooking.

Washington Local Sales Tax Calculator

Calculate Washington local sales tax quickly with our authoritative and accessible tool.

PCB Trace Width Calculator

Calculate the optimal PCB trace width for your electronics project with this advanced tool, ensuring precision and reliability.

Brick Calculator - Estimate Bricks and Mortar

Accurately calculate the number of bricks, mortar, cement, and sand needed for your wall. Accounts for wall size, brick type, mortar joints, and wastage.

CURB-65 Score Calculator

Calculate the CURB-65 score to assess the severity of pneumonia. This tool is designed for healthcare professionals to aid in clinical decision-making.

Cronbach's Alpha Calculator – Internal Consistency & Reliability

Cronbach

Apparent & Absolute Magnitude Calculator

Calculate the apparent and absolute magnitudes of stars with our interactive tool, designed for advanced enthusiasts and professionals in life and earth sciences.

Katch-McArdle Formula Calculator

Calculate your Basal Metabolic Rate (BMR) using the Katch-McArdle Formula with our precise and accessible online tool.

Lead Generation ROI Calculator

Calculate your lead generation ROI with our professional-grade online tool.

About Us - CalcDomain | Expert-Built Financial Calculators

Meet the multidisciplinary team behind CalcDomain. Engineers, MBAs, physicians, and financial experts creating accurate, free calculators since 2024.

House Affordability Calculator - How Much House Can I Afford?

Calculate how much house you can afford based on your income, debts, down payment, and other factors. Get instant estimates with detailed breakdown of purchase price, monthly payments, and debt-to-income ratios.

Radians to Degrees Converter | CalcDomain

Convert radians to degrees instantly with our interactive calculator, designed for students, engineers, and professionals.

Relative Fat Mass (RFM) Calculator

Use the Relative Fat Mass (RFM) Calculator to estimate your body fat percentage based on height and waist circumference.

Crane Lift Plan Calculator

Advanced Crane Lift Plan Calculator for construction professionals to plan and optimize crane operations efficiently.

Root Cause Analysis (5 Whys) Generator

An interactive 5 Whys calculator to identify root causes of problems in business operations. Developed by Ugo Candido.

Bonus Gross Up Calculator

Gross-up a bonus to ensure your employee receives the exact net amount. Handles federal supplemental rate, state/local withholding, Social Security cap, and Additional Medicare tax.

Cycling Power Calculator

Calculate your cycling power effortlessly with our authoritative and user-friendly calculator. Perfect for cyclists looking to optimize performance.

Maine State Income Tax Calculator

Maine income tax calculator: instantly estimate your Maine state income tax using up-to-date brackets. Calculate tax due, effective rate, marginal rate, and after‑tax income by filing status.

Frequency Distribution Calculator

An authoritative frequency distribution calculator designed for students and professionals to compute and analyze statistical data efficiently.

NEC Transformer Overcurrent Protection Calculator

Professional-grade NEC transformer overcurrent protection (OCPD) calculator. Compute primary and secondary full-load currents, apply NEC-based sizing factors (125%–250%), and select the next standard device size per NEC 240.6(A). Built for engineers, electricians, and plan reviewers.

BTU to Joules (J) Converter (and BTU/hr to Watts)

Instantly convert BTU to Joules (J) and Kilojoules (kJ). Our dual calculator also converts power from BTU/hr to Watts (J/s) for engineering and physics.

Embroidery Calculator - Price & Stitch Time Estimator

Accurately calculate embroidery job prices, machine time, and material costs. Input stitch count, speed, and costs to estimate profits and pricing.

Northwest Territories (NWT) Territorial Tax Calculator

Calculate your Northwest Territories (NWT) territorial tax with our interactive and accessible tool. Optimize your finances effectively.

Heron's Formula Calculator

Calculate the area of a triangle using Heron

Unit Circle Calculator

Calculate sine, cosine, and tangent values using the unit circle. Perfect for students and professionals engaged in trigonometry.

Pizza Calculator

The ultimate pizza calculator to determine how much pizza you need. Perfect for parties and gatherings.

Helical Pile Capacity Calculator

Calculate the capacity of helical piles with precision. Ideal for engineers and construction professionals.

Soil Erosion Calculator (USLE)

Calculate soil erosion using the USLE method. An invaluable tool for environmental scientists and engineers.

Recipe Multiplier / Scaler Calculator

Easily scale your recipes to any serving size with our interactive Recipe Multiplier Calculator. Perfect for cooks and bakers of all levels.

Pesticide Application Rate Calculator

Calculate the precise application rate for pesticides in agricultural settings. Optimize your pesticide usage with our authoritative tool.

Eigenvalue and Eigenvector Calculator

Compute eigenvalues and eigenvectors with our interactive calculator. Perfect for students and professionals in linear algebra.

Mortgages — Calculators & Guides | CalcDomain

All our mortgage calculators and guides in one place: mortgage refinance, FHA, VA, and rent vs. buy. Explore methods, formulas and FAQs.

Power Factor Correction Calculator

Calculate power factor correction with precision. Optimize your electrical systems using our authoritative and user-friendly calculator.

Radioactive Decay Calculator

Calculate radioactive decay with precision. Analyze half-life and remaining activity of radioactive substances.

Steel Grating Calculator

Calculate the weight and dimensions of steel gratings with our precise, user-friendly calculator designed for civil engineering professionals.

Culvert Design Calculator

Calculate culvert design specifications efficiently with our interactive tool, based on authoritative engineering data.

Universal Converters | Conversions

All-purpose unit conversion and numeral formats.

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Skins Game Calculator

Calculate golf skins with our interactive and user-friendly Skins Game Calculator. Perfect for golf enthusiasts aiming for fair payouts.

HELOC Calculator | Finance › Mortgages

Professional HELOC calculator: estimate your maximum line, CLTV, interest-only draw payment, amortized repayment, and total interest. Mobile-first, accessible, and accurate.

Time Zone Converter

Convert time across different time zones with our precise, user-friendly tool. Perfect for travelers and professionals working with international teams.

NPV (Net Present Value) Calculator | Finance & Investment

Professional NPV calculator for periodic or dated (XNPV) cash flows. Clear UX, sensitivity table, formulas, worked example, and FAQ.

Rocket Equation Calculator (Tsiolkovsky)

Use our interactive Rocket Equation Calculator based on Tsiolkovsky

Steel Beam Design Calculator (AISC)

Interactive tool to calculate steel beam design parameters according to AISC standards. Designed for civil and structural engineers.

Control Premium Calculator

Calculate the control premium in mergers and acquisitions with our precise and accessible calculator.

Octal Calculator

Effortlessly convert and calculate octal numbers with our high-performance Octal Calculator. Perfect for students, engineers, and anyone dealing with number systems.

Standard Error Calculator

Calculate the standard error of a sample with our advanced, easy-to-use online calculator, ensuring precise results for statistical analysis.

Sound Transmission Loss (STL) Calculator

Calculate the sound transmission loss with precision using our STL Calculator designed for acoustics professionals.

Ankle-Brachial Index (ABI) Calculator

Calculate your Ankle-Brachial Index (ABI) to assess your risk for peripheral artery disease.

Rail Fence Cipher Encoder / Decoder

Free rail fence cipher encoder and decoder. Choose the number of rails, optionally keep spaces and punctuation, visualize the zigzag, and encode or decode your message.

R-squared Calculator

Use our R-squared calculator to determine the coefficient of determination for statistical analysis.

Allele Frequency Calculator | Hardy–Weinberg Equilibrium, MAF, Heterozygosity

Allele frequency calculator for biology and population genetics. Compute p and q, expected genotype frequencies under Hardy–Weinberg equilibrium, heterozygosity, MAF, chi-square HWE test, and 95% CI.

Kinetic Energy Calculator | Science › Physics

Kinetic Energy Calculator: precisely compute kinetic energy (KE), mass, or velocity with instant unit conversions. Professional-grade, mobile-first, and WCAG 2.1 AA accessible.

Jacobian Matrix Calculator (2R Manipulator)

Calculate the Jacobian matrix for a 2R manipulator. A precise tool for robotics engineers and researchers.

Greenhouse Climate Control Calculator

Calculate optimal climate control settings for your greenhouse with our precise and accessible tool.

Magnetic Declination Calculator

Calculate magnetic declination accurately with this advanced tool based on authoritative data sources.

Eurocode 8 Seismic Design Calculator (Response Spectrum)

Calculate seismic design parameters using Eurocode 8 standards. An authoritative tool for civil engineers.

Installment Loan Calculator: Monthly Payment & Amortization

Use this free Installment Loan Calculator to find your monthly payment, total interest, and see a complete amortization schedule. Fully accessible (WCAG AA).

Soil Nail Wall Design Calculator

Advanced soil nail wall design calculator for construction professionals. Ensure reliable and accurate design calculations based on authoritative engineering standards.

Thin Film Interference Calculator

Calculate thin film interference using precise physics formulas. Ideal for optics students and professionals seeking accurate and quick results.

French Pension Calculator

Calculate your French pension easily with our interactive tool. Understand how much pension you can receive based on your contributions and years of service.

Goal Difference Calculator

Calculate the goal difference in soccer matches with our interactive tool tailored for coaches, analysts, and enthusiasts.

Regular Icosahedron Volume Calculator

Calculate the volume of a regular icosahedron using our precise and accessible tool. Perfect for students, educators, and geometry enthusiasts.

Drywall Calculator | Construction — Framing & Roofing

Professional drywall calculator. Estimate drywall sheets, wall and ceiling coverage, waste, screws, and project cost. Built for contractors and serious DIYers.

Employee Turnover Rate Calculator

Calculate the employee turnover rate efficiently with our interactive and authoritative tool. Designed for HR professionals and business managers.

Section 179 Deduction Calculator

Calculate your potential Section 179 tax deduction for business equipment purchases.

ELISA Data Analysis Calculator

Advanced ELISA data analysis calculator for life sciences. Perform precise and reliable calculations with our accessible online tool.

Cartesian to Polar Converter | Convert (x, y) to (r, θ)

Convert Cartesian coordinates (x, y) to polar form (r, θ). Supports degrees and radians, uses atan2 to handle all quadrants, and shows the formulas. Perfect for math, engineering, and graphics.

Blackbody Radiation Calculator (Planck's Law)

An authoritative tool for calculating blackbody radiation using Planck

Workout & Calories Burned Calculator (MET + HR Zones) – CalcDomain

Plan a workout, estimate calories burned with METs, and get target heart-rate zones. Build multi-activity sessions, adjust intensity, and export your plan.

Air Quality Index (AQI) Calculator

Calculate the Air Quality Index (AQI) easily with our interactive tool. Understand air pollution levels and their impact on health.

UML Diagram Generator

Generate UML diagrams effortlessly with our interactive generator designed for software engineers.

River Discharge (Velocity-Area) Calculator

Calculate river discharge using the velocity-area method with precise and professional-grade tools.

Pediatric Maintenance Fluid Calculator

Calculate the daily maintenance fluid requirements for pediatric patients using this interactive tool.

Dog Age Calculator

Calculate your dog

Torque Calculator | Mechanical Engineering Tool

Professional torque calculator for engineers and students. Compute torque from force and lever arm (with angle), or from power and rotational speed. Includes unit conversions (N·m ⇄ lbf·ft), formulas, examples, and FAQs.

Gallons to Liters Converter (US & UK) | CalcDomain

Instantly convert gallons to liters (gal to L) with our free bidirectional calculator. Supports both US liquid gallons and UK imperial gallons.

Paint Mixing Calculator

Easily calculate the perfect paint mix for your DIY projects with our Paint Mixing Calculator.

AHP Calculator – Analytic Hierarchy Process (Multi-Criteria Decision)

Free AHP calculator (Analytic Hierarchy Process). Define criteria and alternatives, perform pairwise comparisons using Saaty scale, get weights, consistency ratio (CR), and global priorities. Browser-based, no upload.

PID Controller Tuning Calculator (Ziegler-Nichols)

Calculate PID controller settings using the Ziegler-Nichols method with our authoritative and accessible tool.

Freight Class Calculator

Calculate your freight class easily with our authoritative and accessible calculator designed for logistics and supply chain professionals.

Maclaurin Series Expansion Calculator

Use our interactive Maclaurin Series Expansion Calculator to perform precise mathematical computations.

Quarter Mile (Drag Racing) Calculator

Calculate your vehicle

Event Budget Calculator

Calculate your event budget efficiently with our professional-grade Event Budget Calculator.

Power Calculator | Science • Physics

Professional power calculator for DC and AC circuits. Compute real power (W, kW) and apparent power (VA) using V&I, V&R, or I&R, including power factor and three‑phase options. Accessible, mobile‑first, and standards‑based.

Earned Value Management (EVM) Calculator

An authoritative calculator for Earned Value Management (EVM) to assist project managers in tracking project performance and progress.

Return on Equity (ROE) Calculator

Calculate Return on Equity (ROE) effortlessly with our interactive tool. Ideal for finance professionals and students looking to understand corporate profitability.

Chinese Pension Calculator

Calculate your expected pension in China with our user-friendly Chinese Pension Calculator.

Decimal to Fraction Converter (Reduced, Improper, Mixed) | CalcDomain

Convert any terminating decimal to a fraction instantly. Get the simplified fraction, improper fraction, and mixed number with detailed step-by-step calculations.

Superannuation Calculator (Australia)

Calculate your superannuation savings in Australia with our interactive tool. Optimize your retirement planning with expert guidance.

Nitrogen Balance Calculator

Calculate your nitrogen balance easily with our authoritative and user-friendly tool.

BOD (Biochemical Oxygen Demand) Calculator | Environmental Engineering

Calculate Biochemical Oxygen Demand (BOD) with our precise, professional-grade tool designed for environmental engineers.

German Solidarity Surcharge (Solidaritätszuschlag) Calculator

Professional German Solidarity Surcharge (Solidaritätszuschlag) calculator. Compute Soli on personal income tax, corporate tax, or capital income withholding with accurate thresholds and a11y-first UX.

Schrödinger Equation Calculator (Particle in a Box)

Calculate the energy of a particle in a box using Schrödinger

RESP (Registered Education Savings Plan) Calculator

Interactive tool to calculate contributions and government grants for Registered Education Savings Plans (RESP) in Canada.

Soil Texture Triangle Calculator

Use the Soil Texture Triangle Calculator to determine the soil texture class. Input sand, silt, and clay percentages to get your result.

Women's Shoe Size Converter

Convert women

LC Filter Calculator

Calculate the parameters of LC filters with our expert-designed tool. Perfect for engineers and electronics enthusiasts.

URL Encoder/Decoder

Easily encode or decode URLs with our advanced URL Encoder/Decoder tool. Essential for developers and SEO specialists.

Fick Principle Cardiac Output Calculator

Calculate cardiac output using the Fick principle with our advanced, user-friendly calculator.

Net Worth Calculator

Calculate your net worth with our advanced personal finance calculator. Input your assets and liabilities to determine your financial standing instantly.

Variance Calculator: Sample & Population, Steps & Formulas | CalcDomain

Free variance calculator. Paste your data and get sample variance, population variance, standard deviation, mean, count, sum, range, and quartiles. Shows formulas and step-by-step explanation.

South Carolina State Income Tax Calculator

South Carolina state income tax calculator. Instantly estimate SC income tax using current brackets, marginal and effective rates, and a clear breakdown.

Barcode Generator - Create EAN, UPC, QR Codes & More

Instantly create high-quality, scannable 1D & 2D barcodes. Generate EAN-13, UPC-A, Code 128, QR Codes, and more. Free, fast, and accessible.

Playfair Cipher Encoder/Decoder

Use our Playfair Cipher calculator to encode and decode messages with this classic cryptographic technique.

IIR Filter Design Calculator

Calculate and design IIR filters with our interactive tool. Tailored for engineers and signal processing experts, ensuring precise results.

BSA Calculator (Body Surface Area) – Accurate Multi-Formula Tool

Professional Body Surface Area (BSA) calculator using Mosteller, Du Bois, Haycock, and Gehan–George formulas. Supports metric/US units, accessibility, and printable results.

Idaho State Income Tax Calculator

Idaho income tax calculator: estimate Idaho state income tax for 2024 with a clean, mobile-first tool. Model standard or itemized deductions, pre-tax contributions, credits, and per-paycheck withholding.

Distance Calculator (2D & 3D Euclidean Formula) | CalcDomain

Calculate the straight-line distance between two points ($P_1, P_2$) in 2D or 3D space using the Euclidean distance formula. Includes step-by-step solution and midpoint calculation.

Simpson's Rule Calculator

An interactive calculator to apply Simpson

Cups to Milliliters Converter (US, Legal & Metric) | CalcDomain

Instantly convert cups to milliliters (mL) with our free bidirectional calculator. Supports US Customary, US Legal (240ml), and Metric (250ml) cups.

Put-Call Parity Calculator

Calculate the relationship between the price of European put and call options using the Put-Call Parity Calculator.

Japanese Pension (Nenkin) Calculator

Calculate your Japanese pension with our easy-to-use Nenkin calculator. Understand your potential retirement benefits based on the Japanese pension system.

Human Capital ROI Calculator

Calculate your Human Capital ROI with our precise and accessible tool designed for HR professionals.

Eurocode Load Combination Calculator

Calculate load combinations according to Eurocode 0 & 1 with our authoritative and accessible tool designed for civil engineers.

Green Roof Load Calculator

Calculate the load of green roofs with our advanced engineering tool. Optimize your building

Economic Value Added (EVA) Calculator

Calculate the Economic Value Added (EVA) with our interactive calculator designed for corporate finance professionals.

Cat Age Calculator | Ugo Candido

Easily calculate your cat

Geologic Time Scale Converter

Convert geologic time scales with our interactive calculator, designed for geology enthusiasts and professionals.

Pulley Speed Calculator | Engineering Mechanical Tool

Professional-grade pulley speed calculator. Compute driven RPM, ratio, and belt linear speed with support for slip, unit switching (mm/in), and reverse-solving required pulley size.

Poisson Distribution Calculator | Math Tools

Calculate the Poisson distribution probability with our advanced calculator. Designed for statisticians and data analysts for precise results.

Diophantine Equation Calculator

Solve Diophantine equations easily with our interactive calculator. Perfect for students and professionals in number theory.

Wedding Seating Chart Calculator

Easily calculate and plan your wedding seating chart with this interactive tool. Optimize seating arrangements for your event with ease.

Polygon Interior Angles Calculator

Calculate the interior angles of any polygon with our precise and accessible calculator. Perfect for students, educators, and professionals in geometry.

Grass Seed Calculator

Calculate the amount of grass seed needed for your lawn with our interactive Grass Seed Calculator.

Wind Chill Calculator | Ugo Candido

Calculate the wind chill temperature with our advanced interactive tool, designed for earth science enthusiasts and professionals.

Character Counter - Word, Sentence & Keyword Density Tool

A comprehensive online tool to count characters, words, sentences, and paragraphs. Includes reading time, keyword density, and limits for social media (Twitter, Instagram).

Alaska State Income Tax Calculator

Use this authoritative Alaska State Income Tax Calculator to instantly determine your Alaska state and local income tax liability. Optimized for accessibility (WCAG 2.1 AA), mobile-first, and Core Web Vitals.

Gradient, Divergence, and Curl Calculator

Accurately compute gradient, divergence, and curl with our interactive calculator. Perfect for students and professionals dealing with vector calculus.

British Columbia (BC) Provincial Tax Calculator

Calculate your provincial taxes in British Columbia with our authoritative and accessible tax calculator.

Dewatering System Design Calculator

An advanced dewatering system design calculator for construction professionals, ensuring precise calculations based on authoritative sources.

Fence Calculator: Estimate Panels, Posts & Concrete

Accurately calculate the exact number of fence panels, posts, rails, and bags of concrete needed for your project. Free, instant, and mobile-friendly calculator.

Finite Element Analysis (FEA) 2D Truss Calculator

Use our FEA 2D Truss Calculator to analyze structural elements. Designed for advanced civil engineering applications.

Commercial Real Estate Calculator – DSCR, Cap Rate, Cash-on-Cash

Professional-grade commercial real estate calculator: computes NOI, DSCR, LTV, cap rate, monthly debt service, balloon balance, and cash-on-cash return with an exportable table and clear formulas.

Food Calories (kcal) to Kilojoules Converter

Convert food calories (kcal) to kilojoules (kJ) using our precise and easy-to-use converter. Essential for nutritional calculations and energy conversions.

Heat Index Calculator

Calculate the heat index using our interactive tool, designed for scientists, meteorologists, and enthusiasts. Understand the effects of humidity on temperature perception.

Exponential Distribution Calculator

Calculate and analyze exponential distributions with ease using our interactive tool, designed for advanced statistical analysis.

W-4 Withholding Calculator | US Federal Tax Estimator

Estimate your federal income tax withholding per paycheck and generate ready-to-use W‑4 entries (Steps 3 and 4). Accurate, mobile‑first, and WCAG-compliant.

Structural Engineering Calculators | CalcDomain

Redirecting to Structural Engineering Calculators ...

Gacha / Loot Box Probability Calculator

Calculate the probability of obtaining desired items from gacha games and loot boxes with our precise, user-friendly calculator.

Geodetic Distance Calculator (Vincenty's Formulae)

Calculate geodetic distances with precision using Vincenty

Radiation Shielding Calculator (Half-Value Layer)

Calculate the half-value layer for radiation shielding effectively with our interactive tool.

Ohio State Income Tax Calculator | Authoritative, Fast & Accessible

Ohio income tax calculator: estimate your Ohio state income tax, municipal and school district taxes with precision. Mobile-first, WCAG 2.1 AA accessible, and based on official Ohio tax brackets.

Reverberation Time Calculator (Sabine Formula)

Calculate the reverberation time using the Sabine formula for acoustics. This tool helps you determine the time it takes for sound to decay in a room, essential for audio engineering and room design.

Universal Currency Converter (with Historical Data)

Convert currencies with our advanced Universal Currency Converter. Access historical data and accurate exchange rates from reliable sources.

Day of Week Calculator - Find the Weekday for Any Date

Quickly find the exact day of the week for any given date (past, present, or future). This accessible tool provides instant, accurate results.

Simpson's Diversity Index Calculator

Calculate Simpson

Tower Crane Foundation Design Calculator

An authoritative tool for calculating tower crane foundation design parameters. Ensure safety and compliance with our advanced calculator.

API Latency & Throughput Calculator

Calculate API latency and throughput to optimize performance and efficiency. Ideal for developers and engineers.

Quick Ratio (Acid-Test) Calculator

Calculate the Quick Ratio (Acid-Test Ratio) to assess a company

Vigenère Cipher Encoder/Decoder

Use our Vigenère Cipher calculator to encode or decode text with this classic cryptographic method.

Standard Deviation Calculator | Math — Statistics & Probability

Professional, mobile-first standard deviation calculator. Paste numbers to instantly get sample and population standard deviation, variance, mean, median, range, and more — WCAG 2.1 AA accessible.

Gravel Calculator - Calculate Volume, Weight & Bags

Calculate the exact volume (cubic yards/meters) and weight (tons/tonnes) of gravel needed for your driveway, path, or landscaping project. Includes bag estimates.

Acre-Feet to Gallons Converter | CalcDomain

Convert acre-feet to gallons easily with our accurate and accessible calculator. Essential for water resource management and agriculture.

Pivot Point Calculator

Calculate pivot points for trading with our precise, professional-grade tool. Enhance your trading strategies with accurate calculations.

Gross Rent Multiplier (GRM) Calculator

Calculate the Gross Rent Multiplier (GRM) for real estate investments. Determine the profitability of properties with our advanced GRM calculator.

Roth Conversion Calculator

Calculate the potential tax implications of converting your traditional IRA to a Roth IRA with our interactive Roth Conversion Calculator.

Michigan State Income Tax Calculator

Professional Michigan state income tax calculator. Estimate 2023–2025 Michigan income tax with optional city tax, deductions, exemptions, and per‑paycheck breakdown.

Positive Predictive Value (PPV) Calculator

Calculate the Positive Predictive Value (PPV) of a diagnostic test with precision using our easy-to-use online tool.

GST/HST Calculator

Calculate GST/HST for Canadian taxation with our precise, accessible tool. Ideal for businesses and consumers to determine tax amounts on goods and services.

Vertex Calculator for Parabola (Standard, Vertex, Intercept Form) | CalcDomain

Instantly calculate the vertex (h, k) and axis of symmetry of a parabola from its equation. Supports Standard, Vertex, and Intercept Forms with step-by-step solutions.

Eurocode 4 Composite Beam Design Calculator

Interactive tool for designing composite beams according to Eurocode 4 standards.

Radiation & Dose Conversion Calculator – Convert gray, sievert, rad, rem & more

Fast radiation & dose conversion calculator. Convert between gray (Gy), sievert (Sv), rad, rem, roentgen (R), coulomb/kg, becquerel (Bq) and curie (Ci). Physics-only, non-medical.

Air Force Physical Fitness Test (PFT) Score Calculator

Calculate your Air Force Physical Fitness Test (PFT) score with precision using our interactive tool. Tailored for Air Force personnel and fitness enthusiasts.

Guesstimate Calculator

Use the Guesstimate Calculator to provide quick estimates for engineering tasks, focusing on software development scenarios.

ACI 318 Concrete Slab Punching Shear Calculator

Professional ACI 318 punching shear calculator for two-way slab-column connections. Compute critical perimeter, demand, and φVc capacity for interior, edge, and corner columns per ACI 318-19/22.

Michaelis-Menten Kinetics Calculator

Calculate enzyme kinetics using the Michaelis-Menten equation. Ideal for advanced life science studies and research applications.

Standard Atmosphere Calculator

Calculate standard atmospheric conditions based on altitude. Essential tool for aerospace engineers and enthusiasts.

Internet Speed Calculator — Download Time, Effective Throughput & Bandwidth Needs

Calculate download time, upload time, effective throughput and check if your internet speed fits streaming, gaming, video calls and multi-device usage. Includes latency, jitter, packet loss and overhead.

Glasgow Coma Scale (GCS) Calculator

An authoritative and interactive Glasgow Coma Scale (GCS) calculator for medical professionals to assess a patient

Sphere Calculator (Radius, Diameter, Volume, Surface Area, Mass)

Sphere calculator to find radius, diameter, volume, surface area and even mass from one known value. Enter radius or diameter in mm, cm, m or inches and get all sphere properties. Includes formulas and FAQ.

Stream Discharge Calculator

Calculate stream discharge efficiently with our authoritative tool. Perfect for environmental scientists and engineers.

Loan-to-Value (LTV) Calculator | Ugo Candido

Calculate your Loan-to-Value ratio with our advanced LTV calculator. Ideal for real estate investors and homeowners.

Weighted Average Calculator

Calculate the weighted average of a set of numbers with different weights using our precise, professional-grade online tool.

Regular Polygon Calculator (Area, Perimeter, Apothem, Angles) | CalcDomain

Solve any regular N-gon completely. Calculate Area, Perimeter, Apothem, Radius, Internal/Central Angles by entering the number of sides and any one dimension. Includes step-by-step solutions.

Flooring Calculator | Construction — Framing & Roofing

Professional flooring calculator to estimate square footage, waste, boxes, planks/tiles, trim, underlayment, and total cost. Optimized for accuracy, accessibility, and mobile.

Child-Pugh Score Calculator

Calculate the Child-Pugh score to assess the prognosis of chronic liver disease and cirrhosis mortality risk with our interactive tool.

Auto Loan Calculator | Personal Loans | CalcDomain

Professional Auto Loan Calculator for car buyers and planners. Estimate monthly payment, amount financed, total interest, sales tax and fees impact, and total cost. Accessible, mobile-first, and optimized for performance.

Brewster's Angle Calculator

Interactive Brewster

Likelihood Ratio Calculator

An authoritative tool to calculate likelihood ratios for medical diagnostics. Fully accessible and optimized for performance.

heloc calculator — Draw & Repayment, Index+Margin, CLTV Limit

Professional HELOC calculator with interest-only draw period and amortized repayment. Supports index+margin, CLTV credit limit, fees, validation, printable schedule, and clear formulas.

Cardio Calculator - Calculate Calories Burned & Heart Rate Zones

Estimate calories burned from 100+ activities using MET values, or find your target heart rate zones (based on AHA guidelines) for effective cardio training.

Pirate Name Generator

Generate your unique pirate name with our fun and interactive Pirate Name Generator. Discover your alter ego on the high seas!

Reorder Point Calculator

Calculate your reorder point effortlessly with our advanced tool designed for logistics and supply chain management.

PB to TB Converter – Petabytes to Terabytes (Decimal & Binary)

PB to TB converter with decimal (SI) and binary (IEC) options. Convert petabytes to terabytes and back, with quick examples and data storage reference table.

Mean, Median, Mode, Range Calculator | CalcDomain

Compute mean, median, mode, and range instantly from a list of numbers. Mobile-first, accessible, and precise—optimized for students, analysts, and professionals.

Biweekly Mortgage Payment Calculator

Calculate your potential savings with a biweekly mortgage payment plan using our advanced calculator tool.

Synthetic Division Calculator

Access a professional-grade synthetic division calculator to simplify polynomial division problems.

Furniture Layout Calculator - Check Space & Clearance

Calculate if your furniture fits. Enter room and furniture dimensions to check for adequate walkways, density, and usable space. Avoid cramped layouts.

Equipment Lease vs. Buy Calculator

Compare the costs of leasing versus buying equipment with our interactive calculator. Make informed financial decisions for your business.

Influence Line Diagram Generator | Engineering Calculator

Generate influence line diagrams for civil engineering structures with our advanced calculator.

Composite Beam Design Calculator (AISC)

Calculate composite beam design parameters based on AISC standards with our authoritative and accessible online tool.

Commercial Real Estate Pro Forma Calculator

Calculate commercial real estate pro forma with our comprehensive and interactive tool. Designed for professionals in finance and real estate to evaluate investment opportunities effectively.

Pyramid Calculator – volume, surface area, base & slant height

Free pyramid calculator. Choose square or rectangular pyramid, enter base and height, and get volume, lateral area, total surface area, base area and slant height. Shows formulas and examples.

Grams to Ounces Converter (g → oz) | CalcDomain

Instant grams to ounces converter. Convert g to oz or oz to g, choose standard (avoirdupois) or troy ounces, see formulas, examples, and a quick reference table. Accurate unit conversion for cooking, shipping, science and everyday use.

UK Income Tax Calculator (England & NI) | CalcDomain

Professional UK tax calculator for England & Northern Ireland. Estimate Income Tax, National Insurance, Student Loan repayments, and take-home pay for annual, monthly or weekly periods.

Micrometers to Millimeters Converter (µm ⇄ mm) – Precise Length Conversion

Fast micrometers to millimeters converter (µm to mm and mm to µm), with extra units (nm, m, inches). Includes formulas, examples and quick reference table for engineering use.

CBM Calculator – Cubic Meter Volume for Boxes, Pallets & Containers

CBM calculator for shipping: calculate cubic meter (m³) volume from length, width, height and quantity. Supports cm, m and inches, plus volume to CBM converter, formulas and examples.

Mississippi State Income Tax Calculator

Calculate your Mississippi state income tax for 2024–2026 using the official rate schedule (0% on the first $10,000, phased flat rate above). Fast, accessible, mobile-first calculator with clear methodology and FAQs.

HSA (Health Savings Account) Calculator

Calculate your potential savings with an HSA. Understand the benefits and plan your financial future effectively with our advanced HSA calculator.

District of Columbia Income Tax Calculator

DC income tax calculator: estimate your Washington, DC state income tax, marginal rate, effective rate, and take‑home pay. Mobile‑first, accessible, and accurate for tax year 2024.

Dram to Grams Converter – Avoirdupois & Apothecaries (dr ⇄ g)

Convert drams to grams and grams to drams. Supports both avoirdupois drams and apothecaries drams, with clear formulas, examples, and quick reference table. Not for medical dosing.

Process Capability (Cp & Cpk) Calculator

Interactively calculate process capability indices Cp and Cpk with this professional-grade tool, ensuring operational excellence.

Harris-Benedict Equation Calculator

Calculate your Basal Metabolic Rate (BMR) using the Harris-Benedict Equation. Tailored for health and fitness enthusiasts seeking accurate nutritional insights.

Restriction Enzyme Digest Calculator

An advanced calculator for determining the results of a restriction enzyme digest in molecular biology.

Cartesian to Spherical Converter | Convert (x, y, z) to (ρ, θ, φ)

Convert 3D Cartesian coordinates (x, y, z) to spherical coordinates. Supports math and physics conventions, degrees/radians, and shows formulas. Ideal for multivariable calculus, physics, engineering and 3D graphics.

Heptagon Calculator – area, perimeter, side, apothem & circumradius

Free regular heptagon calculator. Enter side, perimeter, area, apothem or circumradius and get all other heptagon properties instantly. Includes formulas, steps, and FAQ.

Soil Salinity EC Converter – dS/m, µS/cm, ppm & Salinity Classes

Convert soil electrical conductivity (EC) between dS/m, mS/cm, µS/cm, mmhos/cm and S/m. Estimate salinity in ppm and classify soil salinity (non-saline to very strongly saline) with clear thresholds and explanations.

General Utility Calculators | CalcDomain

Handy general-purpose tools: unit & data converters, time & currency utilities, translators/encoders, generators & validators, puzzle solvers, game odds, and fun name/quiz tools.

SWOT Analysis Generator

Create a comprehensive SWOT analysis with our interactive generator. Identify strengths, weaknesses, opportunities, and threats effortlessly.

Energy Unit Converter – Joules, Calories, kWh, BTU, Wh, eV

Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU and electronvolts. Professional energy unit converter with formulas, examples and advanced physics units.

Cohen's Kappa Calculator – Inter-Rater Reliability

Cohen

Electrical & Wire Converters | Conversions

AWG to metric wire size conversions.

West Virginia State Income Tax Calculator

Accurately estimate West Virginia state income tax, effective tax rate, marginal bracket, and per-paycheck withholding. Mobile-first, WCAG-accessible calculator for residents and workers in WV.

Centipoise to Pascal-Seconds Converter – cP to Pa·s, mPa·s, Poise

Convert dynamic viscosity between centipoise (cP) and pascal-seconds (Pa·s). Professional cP to Pa·s converter with support for Poise, mPa·s, typical fluid presets, formulas and explanations.

Caesar Cipher Encoder/Decoder

An interactive Caesar Cipher calculator to encode and decode messages.

Life Expectancy Calculator

Estimate your life expectancy with our advanced calculator based on scientific data.

Exchange Ratio Calculator

Calculate the exchange ratio for mergers and acquisitions with this authoritative tool.

Life & Earth Sciences Calculators | CalcDomain

Ecology, hydrology, soils, climate, geoscience and astrophysics tools: predator–prey models, biogeography, diffusion, groundwater & rivers, soil loss & salinity, GWP & ocean pH, tectonics, radiocarbon dating, stellar/photometric calculators and more.

Cartesian to Cylindrical Coordinate Converter - CalcDomain

Convert Cartesian coordinates (x, y, z) to Cylindrical coordinates (ρ, φ, z) instantly. Perfect for students, engineers, and professionals working with 3D coordinate systems.

Self-Employment Tax Calculator | US Federal | CalcDomain

Professional self employment tax calculator for US federal taxes. Instantly estimate Social Security and Medicare self-employment taxes, the deductible portion, and the Additional Medicare Tax with authoritative methodology.

Covered Call Calculator

Calculate potential profit or loss from a covered call strategy with our interactive calculator.

A-a Gradient Calculator

Calculate the alveolar-arterial (A-a) gradient quickly and accurately with this advanced medical tool for healthcare professionals.

Drug Half-Life Calculator

Calculate the half-life of drugs with precision. This tool helps pharmacists, doctors, and researchers to estimate the time required for a drug

Retaining Wall Stability Calculator

Calculate the stability of retaining walls with this professional-grade tool. Designed for civil engineers and construction professionals to ensure safety and compliance.

IV Calculator for Pokémon

Accurately calculate individual values (IVs) of your Pokémon to maximize their potential.

Roman Units Converter – Ancient Roman Measures & Roman Numerals

Convert ancient Roman units of length, volume and weight (pes, passus, amphora, sextarius, libra) to modern SI units, and convert Roman numerals to decimal and back.

Braille Translator | Unified English Braille & Grade 1

Translate English text to Grade 1 Braille and back. Shows dot patterns, Unicode Braille cells, and handy copy actions for accessibility and education.

Cerebral Perfusion Pressure (CPP) Calculator

Calculate Cerebral Perfusion Pressure (CPP) accurately with our advanced medical calculator. Essential for healthcare professionals managing critical care patients.

New Hampshire State Income Tax Calculator

Accurately calculate New Hampshire state income tax for interest and dividends by year. Understand NH’s 2025 repeal, exemptions, and effective rates with an accessible, mobile-first tool.

PaO2/FiO2 (P/F) Ratio Calculator

Calculate the PaO2/FiO2 ratio, a key metric in assessing lung function, with our advanced and accessible online tool.

Pregnancy Weight Gain Calculator | Evidence-based, Accessible Tool

Pregnancy Weight Gain Calculator: find your evidence-based recommended weight gain by week based on pre-pregnancy BMI. Accurate, WCAG-accessible, mobile-first, and optimized for Core Web Vitals.

Present Value of an Annuity Calculator

Calculate the present value of an annuity with our expert-grade financial math tool.

Fuel Economy Calculator - Calculate MPG, L/100km & Trip Cost

Calculate your vehicle

Plate Loading Calculator

Calculate the optimal plate loading for your strength training routines with precision and ease.

Black-Scholes Option Pricing Calculator

Calculate European call and put options using the Black-Scholes model. Ideal for finance professionals and students.

New Brunswick Provincial Tax Calculator

Calculate your New Brunswick provincial tax easily with our interactive calculator. Understand your tax obligations and optimize your financial planning.

Bradford Factor Calculator

Calculate the Bradford Factor to manage employee absenteeism efficiently.

Rems to Pixels Converter – REM ↔ PX with Custom Root Font Size

Convert rems to pixels and pixels to rems with a custom base font size. Professional REM ↔ PX converter for CSS developers, with presets, live CSS snippet and common conversion table.

Molar Mass Calculator

Calculate the molar mass of any compound with our interactive and accessible tool. Perfect for chemistry students and professionals.

Fuel Economy Converters | Conversions

Convert between mpg and L/100km.

Sensitivity and Specificity Calculator

Calculate diagnostic test sensitivity and specificity with our interactive calculator. Perfect for healthcare professionals and researchers.

Regression Calculator – Linear Regression, Correlation & Prediction

Online regression calculator. Paste or type your X–Y data, get slope, intercept, correlation (r), R², standard error, ANOVA table and predicted values. Includes scatter plot and residuals.

Mean Arterial Pressure (MAP) Calculator

Calculate your Mean Arterial Pressure (MAP) with our precise and accessible online calculator designed for health professionals.

Lateral Earth Pressure Calculator (Rankine Theory)

Calculate lateral earth pressure using Rankine

Drywall Calculator - Estimate Sheets, Screws, and Mud

Calculate the exact number of drywall sheets, joint compound, tape, and screws for your project. Accounts for walls, ceilings, openings, and waste factor.