Online Calculators with worked examples and cited sources
Search 1000+ free calculators or browse by hub. Every tool answers a specific money question, shows the formula behind its result, and cites dated public data — so you see exactly how each number is reached. Missing a calculator? Found an error? Tell me — fixes usually ship within a week.
Browse by hub
Loans & Payments
What’s my monthly payment? How much interest will I pay? When is it finally paid off?
Saving & Investing
Plan a savings goal, project investment growth, compare saving with investing, and adjust for inflation and fees — with a built-in planner and specialized calculators.
Investment Returns
Calculators that turn what you invested and what you got back into a total and annualized return you can compare across different assets.
Business & Margins
Calculate gross, contribution, operating and net margin, set target prices, test profit scenarios and find specialist tools for different business models.
Taxes
Estimate what you owe. These calculators break down tax on income, sales, and other common situations.
Math
Arithmetic, fractions, algebra, geometry, trigonometry and statistics — with formulas, step-by-step solutions and verified, reproducible results.
Everyday Tools
Start from an everyday decision — a cost, a saving, a fee, a payback or a comparison — and find the calculator that answers it.
Education
Check whether your target grade is still reachable and exactly what to do next — plus GPA, attendance, study-time and college-cost calculators, with the formula shown for every result.
Income & Career
Compare salary, hourly pay, benefits and working time to understand what a job or offer is economically worth.
Calculators by hub
Loans & Payments
- 401(k) Loan Payoff Calculator
- Adoption Loan Calculator
- Agricultural Loan Calculator
- Appliance Financing Payoff Calculator
- ATV Loan Calculator
- Account-Based Pension Calculator (Australia)
- Auto Loan Calculator & Dealer Deal Auditor
- Auto Loan Payoff Calculator
- Balance Transfer Fee Calculator
- BNPL Payoff Calculator
Saving & Investing
- 401(k) Balance Change Calculator
- 401(k) Withdrawal Calculator
- 403(b) Calculator
- 457(b) Calculator
- Adoption Savings Calculator
- Bonus Investment Growth Calculator
- Annuity Accumulation Calculator
- Annuity Payout Calculator
- Superannuation Growth Calculator (Australia)
- Term Deposit Calculator (Australia)
Investment Returns
- Angel Investment Calculator
- Arcade Business ROI Calculator
- Art Investment Calculator
- ATM Machine ROI Calculator
- Axe Throwing Business ROI Calculator
- Batting Cage ROI Calculator
- Billboard ROI Calculator
- Bitcoin Price Change Calculator
- Bond Coupon Payment Calculator
- Bond Future Value Calculator
Business & Margins
- Affiliate Marketing Commission Calculator
- After-Hours Service Surcharge Calculator
- App Development Cost Per Feature Calculator
- App Revenue Per Install Calculator
- ARPU Calculator
- ARR Growth Rate Calculator
- Auction Seller Commission Calculator
- Average Order Value Calculator
- Bakery Margin Calculator
- Break-Even Calculator: Units, Revenue & Margin of Safety
Taxes
- 401(k) Contribution Percent Calculator
- Franking Credits Calculator (Australia)
- Medicare Levy & MLS Calculator Australia (2024-25)
- Super Guarantee Calculator (Australia)
- Automatic Gratuity Calculator
- Précompte Mobilier Calculator (Belgium)
- Bonus Tax Calculator
- 13th Salary Calculator (Brazil)
- FGTS Calculator (Brazil)
- IOF Calculator (Brazil)
Math
- Area Calculator — Rectangle, Triangle, Circle
- Circle Calculator — Area & Circumference
- Combinations and Permutations Calculator
- Complex Number Calculator
- Degrees to Radians Converter
- Exponent Calculator — Powers
- Fraction Calculator — Add, Subtract, Multiply
- Fraction Simplifier — Reduce to Lowest Terms
- Fraction to Decimal Calculator
- Free Throw Percentage Calculator
Everyday Tools
- Acupuncture Cost Per Session Calculator
- Air Conditioner Payback Calculator
- Annual vs Monthly Subscription Savings Calculator
- Attic Fan Payback Calculator
- Auction Buyer's Premium Calculator
- Babysitter Cost Per Hour Calculator
- Barber Cost Per Cut Calculator
- Boat Cost Per Trip Calculator
- Booking Fee Calculator
- Bulk Buying Savings Calculator
Education
- Acceptance Rate Calculator
- Annual Tutoring Savings Calculator
- Attendance Rate Calculator — Target & Absence Planner
- Classroom Teacher Cost Per Student Calculator
- College Meal Plan Cost Per Meal Calculator
- Course Completion Rate Calculator
- Financial Aid Coverage Rate Calculator
- Gap Year Savings Calculator
- GPA Calculator & Cumulative GPA Planner
- Grade Calculator & Course Outcome Planner
Income & Career
- Bonus Percentage of Salary Calculator
- Cost of Living Raise Calculator
- Employee Benefits Cost Calculator
- Employee Cost Per Hour Calculator
- Employee Equity Pool Calculator
- Employee Overtime Percentage Calculator
- Employer 401(k) Match Calculator
- Freelance Hourly Rate Calculator
- Graduate Degree Salary Premium Calculator
- Overtime Calculator: FLSA, California, Double-Time & Regular Rate
Latest updated tools
- Advanced Scientific Calculator with Calculation Verification
- Grade Calculator & Course Outcome Planner
- 2026 IRA Decision Calculator: Traditional, Roth & Backdoor Roth
- Student Loan Calculator & Overpayment Planner
- Salary to Hourly Calculator: True Rate & Offer Comparison
- Sales Tax Calculator by State
- Self-Employment Tax Calculator
- Percentage Calculator
- Auto Loan Calculator: Car Payment, Tax & Total Cost
- Personal Loan Early Payoff Calculator
- EMI Calculator (India)
- Cash-on-Cash Return Calculator & Underwriting Stress Test
- Return on Equity Calculator
- Percent Error Calculator
- Unit Price Calculator
- Cost Per Mile Calculator
- MBA ROI Calculator
- Scholarship Amount Calculator
- Debt-to-Income Ratio Calculator
- Capital Gains Tax Calculator
- Effective Tax Rate Calculator
- Estate Tax Calculator
- Inheritance Tax Calculator
- Gift Tax Calculator
- Conversion Rate Calculator
- Freelance Hourly Rate Calculator
- PayPal Fee Calculator
- Stripe Fee Calculator
- Solar Panel Payback Calculator
- Credit Card Payoff Calculator: Payoff Date & Interest
- Compound Interest Calculator
- Break-Even Calculator: Units, Revenue & Margin of Safety
- Childcare Subsidy & Eligibility Calculator
- Loan Payoff Calculator
- Down Payment Calculator
- Closing Cost Calculator
- Loan-to-Value Calculator
- 401(k) Withdrawal Calculator
- Future Value Calculator
- Savings Goal Calculator
Calculators in other languages
- Calculadoras en Español →
- Calcolatori in Italiano →
- Calculateurs en Français →
- Calculadoras em Português →
- Rechner auf Deutsch →
Suggest an improvement
Found a calculation issue, outdated source, unclear assumption, or missing edge case? Send a short note so we can review it.