Math Conversions Measurement Unit Conversions

Instantly convert millimeters (mm) to inches (in) with our free, interactive calculator. See results as decimals or fractions and use our quick conversion chart.

Generate fancy text fonts for social media (Instagram, Twitter) and convert CSS typography units (px, pt, em, rem, %) with our all-in-one typography converter.

Convert energy between British thermal units (BTU) and joules (J) for heating and cooling calculations.

Convert pressure between pascals (Pa) and bar (Pa to bar and bar to Pa) for engineering applications.

Instantly convert cubic meters to liters and liters to cubic meters. 1 cubic meter = 1000 liters. Includes formula, examples, and FAQ for volume unit conversions.

Instantly convert kilograms (kg) to pounds (lbs) and ounces (oz) with our free, bidirectional calculator. Includes formulas, mental math tricks, and a conversion chart.

Convert tons to pounds instantly. Supports metric tonnes (t) to pounds, US short tons (2000 lb) to pounds, and UK long tons (2240 lb) to pounds. Includes formulas, examples, and FAQ.

Convert pints to liters instantly. Supports both US liquid pint (473.176 mL) and UK imperial pint (568.261 mL). Includes formula, examples, and conversion table.

Convert energy between kilowatt-hours (kWh) and megajoules (MJ).

Convert dBm to Watts easily with our interactive calculator. Ideal for engineers and technicians looking to quickly convert power levels.

Instantly convert centimeters (cm) to inches (in) and feet (ft). Our free calculator shows results in decimals, fractions, and feet + inches for height.

Instantly convert pounds (lbs) and ounces (oz) to kilograms (kg) with our free, bidirectional calculator. Includes formulas, mental math tricks, and a conversion chart.

Convert force (N, kN, kgf, lbf) and torque (N·m, N·mm, kgf·m, kgf·cm, lbf·ft, lbf·in). Choose Force or Torque, pick units, and get instant engineering-accurate results with formulas and examples.

Instantly convert BTU to kWh. Learn the difference between BTU (energy) and BTU/hr (power), and calculate the daily energy use and cost of your air conditioner.

Convert ancient biblical units into modern units: cubit, span, handbreadth, ephah, homer, hin, omer, log, talent, mina, shekel, gerah. Includes modern equivalents (m, L, g) and notes on measurement ranges.

Convert joules to calories and calories to joules instantly. Supports J, kJ, small calories (cal) and food calories (kcal). Uses 1 cal = 4.184 J. Includes formula, explanation and FAQ.

Free speed converter. Instantly convert between miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), knots, and feet per second (ft/s). Includes formulas, examples, and FAQ.

International size mapping for shoes, shirts, dresses, and bras.

Convert wind speed to the Beaufort scale and back. Enter knots, km/h, m/s or mph and get the Beaufort force, description and sea/land effects. Includes full Beaufort table (0–12) and formulas.

Convert gauss to tesla and tesla to gauss instantly. 1 gauss = 1×10⁻⁴ tesla, 1 tesla = 10,000 gauss. Includes milli-tesla (mT), formulas, examples, and magnetic field notes.

Advanced Search Categories Advanced Search Categories Skip to main content Home » Math & Conversions » Measurement Unit Conversions Audit: Complete Formula (LaTeX) + variables + units This section shows the formulas used by the calculator engine, plus variable definitions and units. Unit conversion \[y = x\cdot k\] y = x * k Variables and units No variables provided in audit spec. Sources (authoritative): NIST — Weights and measures — nist.gov · Accessed 2026-01-19 https://www.nist.gov/pml/weights-and-measures NIST — SI units — nist.gov · Accessed 2026-01-19 https://www.nist.gov/pml/owm/metric-si/si-units Changelog Version: 0.1.0-draft Last code update: 2026-01-19 0.1.0-draft · 2026-01-19 Initial audit spec draft generated from HTML extraction (review required). Verify formulas match the calculator engine and convert any text-only formulas to LaTeX. Confirm sources are authoritative and relevant to the calculator methodology. Verified by Ugo Candido on 2026-01-19 Profile · LinkedIn CalcDomain Your trusted source for free online calculators. Accurate, fast, and reliable calculations for every need.

24h↔12h time, hh:mm↔decimal hours.

Convert millibar (mbar) to psi instantly. Enter the pressure, choose units (mbar, bar, Pa, kPa, MPa, psi, atm, torr) and get an accurate conversion. Includes formula, examples, and atmospheric reference values.

Instantly convert degrees to radians (in decimals or in terms of Pi) and vice versa. See the step-by-step formula and simplification for your conversion.

Convert between PSI and kilopascals (kPa) with this precise pressure unit converter. Ideal for tires, hydraulics, pneumatics and industrial applications.

Convert pressure between pascal (Pa), kilopascal (kPa), bar, millibar (mbar), psi, standard atmosphere (atm), torr/mmHg and more. Fast, accurate online pressure unit converter with formulas and examples.

Watts, horsepower, BTU/h, dBm, VA, and lumens relationships.

Instantly convert cups to tablespoons (tbsp) and teaspoons (tsp) with our 3-way cooking calculator. Includes a quick conversion chart for baking (1/4 cup, 1/3 cup, 1/2 cup).

Convert magnetic units in one place: magnetic flux density (tesla, gauss), magnetic field strength (A/m, oersted), magnetic flux (weber, maxwell) and more. Includes formulas, reference table, and CGS ⇄ SI notes.

Convert area units instantly: acres, hectares, square feet, square meters, square yards, square kilometers, square miles, ares and more. Fast online area converter with formulas and examples.

Convert points (pt) to pixels (px) and pixels to points. Uses the standard 96 DPI screen value and lets you set a custom DPI. Includes formula, examples, and common point-to-pixel sizes for web and print.

Convert leagues to miles and kilometers instantly. Supports English land league (3 miles), nautical league (3 nautical miles), French league and custom values. Includes historical notes, formulas and reference table.

Convert speed from miles per hour (mph) to Mach in standard atmosphere. Choose altitude or enter a custom speed of sound. See formulas and typical Mach values for aviation.

Instantly convert micrograms (mcg or µg) to milligrams (mg) and back. 1 mg = 1000 mcg. Includes formula, medical/pharmacy notes, and common dosage examples.

Convert fluid ounces (fl oz) to milliliters (ml) in one click. Supports US fl oz (29.5735 ml) and UK/Imperial fl oz (28.4131 ml), plus reverse ml to fl oz. Includes cooking notes and reference table.

Convert miles per hour (mph) to kilometers per hour (km/h) instantly. Precise factor 1 mph = 1.60934 km/h. Includes reverse kph to mph, decimal control, and common road-speed presets.

Convert Torr to Pascals easily with our interactive calculator. Accurate and reliable, designed for engineers, scientists, and students.

Instantly convert barrels to gallons (US & UK). Our tool clarifies the difference and converts for Oil barrels (bbl), liquid barrels, beer barrels, and dry barrels.

Convert energy and heat units instantly: joules, kilojoules, calories, kilocalories, BTU, watt-hour, kilowatt-hour, and therm. Includes formulas, reference table, and explanations for engineering and HVAC.

Instantly convert meters (m) to nanometers (nm) and micrometers (µm). Our 3-way scientific converter also shows results in scientific notation.

Kitchen-friendly volume conversions for recipes.

Instantly convert tablespoons (tbsp) to teaspoons (tsp), cups, and fluid ounces (fl oz) with our 4-way kitchen conversion calculator. Includes a quick conversion chart.

Instantly convert meters (m) to nanometers (nm) and micrometers (µm). Our 3-way scientific converter also shows results in scientific notation.

Convert slugs to kilograms and kilograms to slugs instantly. Uses the standard definition 1 slug = 14.593902937 kg. Includes formula, examples, and context for engineering and imperial-to-SI conversions.

Degrees↔radians, DMS↔decimal degrees.

Convert kilometers per hour (kph or km/h) to miles per hour (mph) instantly. Uses exact factor 1 km/h = 0.621371 mph. Includes reverse mph to kph, presets, and formula explanation.

Convert pressure between pascals (Pa) and pounds per square inch (PSI) for engineering and fluid power.

Instantly convert Pascals (Pa) to PSI (Pounds per Square Inch). Our advanced 4-way tool also converts kPa, MPa, and PSI in one place.

Convert PSI to Pascals (Pa) and back from Pa to PSI with professional precision. Use the bidirectional pressure converter, see the formula, examples, and a ready-made psi→Pa conversion table.

Convert miles per hour (mph) to feet per second (ft/s) instantly. Uses exact factor 1 mph = 1.46667 ft/s. Includes reverse ft/s to mph, presets, formulas, and quick reference table.

Convert between metric and imperial units for length, area, volume, mass, speed, and temperature. Smart category selector, exact factors, and examples for students, engineers, and everyday use.

Instant volume converter. Convert between liters, US gallons, UK gallons, cubic meters, cubic feet, milliliters, and cubic inches. Includes formulas, quick presets, and FAQ.

Convert CFM (cubic feet per minute) to L/s (liters per second) and back to CFM with engineering precision. Includes formulas, example, HVAC notes, and a ready-made CFM → L/s table.

Convert troy ounces (ozt) to grams (g) and grams to troy ounces with precision for gold, silver, platinum and bullion. Includes formula, example and troy-weight notes.

Convert AWG (American Wire Gauge) to diameter in millimetres (mm) and cross-sectional area (mm²). Includes bidirectional mm → AWG, engineering formulas, and a full AWG size table for electricians and designers.

Convert luggage weight between kilograms, pounds, grams and ounces. See ready-made travel benchmarks (carry-on 8 kg, checked 23 kg, 32 kg heavy), and avoid overweight fees before reaching the airport.

Convert bushels to liters in one click. Supports US (dry) bushel and UK/Imperial bushel, plus reverse liters to bushels. Includes formulas, examples, and a handy conversion table for agriculture and grain trade.

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

Convert poise (P) to pascal-second (Pa·s) and centipoise (cP). Fast dynamic viscosity converter with formulas, examples and reference table for fluids and rheology.

Convert color codes between HEX, RGB, HSL and CMYK in real time. Pick a color, view previews, copy values, and check contrast against white and black. Perfect for designers, front-end developers and printers.

Convert radioactivity from curies (Ci) to becquerels (Bq) and back. Supports mCi, µCi, kBq, MBq, GBq. Includes formula, examples, and reference table for nuclear medicine and radiation protection.

Instantly convert ounces (oz) to grams (g) for cooking and science. Our bidirectional tool also converts fluid ounces (fl oz) to milliliters (ml).

Instantly convert feet (ft) and inches (in) to meters (m) and centimeters (cm) with our bidirectional height and length converter. Includes formula and charts.

Convert light-years to miles instantly. 1 light-year ≈ 5.878625 × 10¹² miles. Includes reverse miles to light-years, formula, examples, and an astronomical distance table.

Convert meters per second (m/s) to miles per hour (mph) instantly. Uses exact factor 1 m/s = 2.23694 mph. Includes reverse mph to m/s, decimal control, and quick speed reference.

Use this kW to HP converter to quickly convert kilowatts to horsepower and back. Includes formulas, examples and engineering-grade reference values.

Convert pressure between standard atmospheres (atm) and kilopascals (kPa).

Convert grams to cups for specific ingredients like flour, sugar, butter, rice, cocoa, honey and more. Bidirectional cups to grams tool, plus conversion table and formulas for baking.

Convert between bandwidth and data rate units: bps, kbps, Mbps, Gbps, B/s, KB/s, MB/s, GB/s. Includes file transfer time calculator, formulas, and FAQ about bandwidth vs data rate.

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.

Convert torque from newton-meters (N·m) to foot-pounds force (ft·lb) and back. Includes inch-pounds, kN·m, formulas, example conversions and quick reference table.

Convert rare, historical and specialized units: cubits, Roman feet, leagues, stones, tolas, troy ounces, gills, hogsheads, barrels, typographic points, picas and more. Includes explanations and reference tables.

Convert barrels per day (bpd) to gallons per minute (gpm) with our precise, professional-grade online tool.

Convert barns to square meters instantly. 1 barn = 1 × 10⁻²⁸ m². Includes millibarns, microbarns, femtobarns and reverse conversion m² to barns, plus nuclear/particle-physics context.

Convert nanometers to angstroms effortlessly with our precise and accessible calculator. Perfect for scientists and students working with atomic-scale measurements.

Instantly convert kilowatt-hours (kWh) to BTU (energy) AND kilowatts (kW) to BTU/hr (power). Our dual scientific calculator clarifies the difference.

Convert inches of mercury (inHg) to pounds per square inch (psi). Supports 0°C/32°F and 60°F reference conditions. Includes reverse psi to inHg, formulas, and conversion table.

Convert ems to pixels and pixels to ems with a customizable base font size. Includes presets (16px, 14px, 18px), formula, and quick reference table for common CSS values.

Convert speed units instantly: kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots, feet per second (ft/s), Mach and more. Includes formulas, common values and FAQ.

Convert rem to sieverts (Sv) and back. Includes millirem (mrem), millisieverts (mSv), microsieverts (µSv). 1 rem = 0.01 Sv = 10 mSv = 10,000 µSv. Use for radiation protection, dosimetry, and medical physics.

Convert between mass and weight units: kilograms, grams, pounds, ounces, stones, tonnes, and newtons. Explains the difference between mass and weight and shows the physics formula W = m × g.

Convert pounds (lb) to grams (g) instantly using the exact factor 1 lb = 453.59237 g. Includes reverse grams to pounds, decimals, cooking-friendly presets, and a quick reference table.

Convert MB to GB instantly. Supports decimal (1 GB = 1000 MB) and binary (1 GiB = 1024 MiB). See also MB to GiB, MiB to GB, and a full conversion table.

Convert stones to pounds easily with our accurate and accessible calculator.

Professional cooking conversion calculator to convert cups, tablespoons, teaspoons, milliliters, ounces, grams, pounds and even ingredient-specific conversions for flour, sugar, butter and more. Fast, accurate, kitchen-ready.

Universal unit converter. Convert instantly between length, area, volume, speed, mass/weight, and temperature. Choose category, pick From and To units, see the formula and get the result.

Convert Joules to kilowatt-hours (kWh) and back with this precise energy unit converter. Includes formulas, worked examples and typical engineering use cases.

Convert townships to square miles, acres and square kilometers (and back). Understand how a U.S. survey township is defined (6×6 miles = 36 square miles) and use the step-by-step township area calculator.

Professional data storage converter and guide. Convert between bits, bytes, KB, KiB, MB, MiB, GB, GiB, TB, TiB, PB and PiB. Understand decimal vs binary prefixes with clear formulas and examples.

Convert square feet to acres (and back) with a professional area converter. See equivalents in square metres and hectares, learn the exact 1 acre = 43,560 square feet formula, and use quick reference tables and worked examples.

Free weight converter. Instantly convert between kilograms, pounds (lb), stones, ounces, and metric/US tons. Includes presets, exact factors, and FAQ.

Professional pennyweight to grams converter. Convert dwt to g and g to dwt using the exact 1 dwt = 1.55517384 g factor. Includes troy ounce and grain equivalents, tables and worked examples for jewelers and bullion dealers.

Convert gigabytes to terabytes (GB to TB) and back in both decimal (1 TB = 1000 GB) and binary (1 TiB = 1024 GiB). See exact formulas, quick reference tables and explanations for disk sizes, cloud storage and backup planning.

Professional scruples to grams converter for apothecary and troy weight. Convert scruple to g and g to scruple using the exact 1 scruple = 1.2959782 g factor. Includes grains, drams, ounces, tables and worked examples.

Professional torque unit converter for N·m, ft·lb, in·lb, N·cm, kgf·m and more. Convert any torque value, see all units at once, check formulas, tables and worked engineering examples.

Evaluate your website typography and see how font size, line length and contrast can impact UX and conversions. Interactive readability checker, CSS examples and best practices for high-converting pages.

Convert viscosity between Pa·s, mPa·s, cP, poise, St, cSt, mm²/s and more. Includes dynamic ↔ kinematic viscosity calculator using density, reference values and engineering formulas.

Convert pascals to PSI (Pa to psi) and back in one step. Professional pressure unit converter with Pa, kPa, MPa, bar, atm, and psi, plus formulas, examples, and reference tables.

Use this free area converter to convert between square feet, square meters, acres, hectares, square miles and more. Includes formulas, tables and examples.

Instantly convert kilopascals (kPa) to pounds per square inch (PSI) and back. Bidirectional kPa to PSI converter with formulas, examples, and pressure conversion table for engineers, mechanics, and everyday users.

Free data storage converter for bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Convert between decimal (kB, MB, GB) and binary (KiB, MiB, GiB) units with instant results, formulas, and examples.

Instantly convert square inches to square feet and back. Bidirectional sq in to sq ft converter with formulas, step-by-step examples, and an area conversion table for flooring, real estate, and DIY projects.

Instantly convert furlongs to miles and miles to furlongs. Horse-racing friendly converter with exact formulas, race-distance examples, and a quick reference table.

Instantly convert ounces to tablespoons and tablespoons to ounces for cooking & baking. Uses the standard US fluid ounce to tablespoon relationship, with clear formulas, examples, and a handy conversion table.

Instantly convert hectares to acres and acres to hectares. Uses the exact factor 1 hectare = 2.47105 acres, with clear formulas, worked examples, and a handy conversion table.

Convert quarts to liters and liters to quarts in one click. Supports US liquid, US dry and Imperial quarts with precise formulas, examples and a handy reference table.