Calculators that show their work
Free, fast and private. Every calculator explains the formula behind the answer and walks through an example, so you can check it — and trust it.
- Formulas shown on every page
- Tested against known answers
- Private — numbers stay in your browser
- Free, no sign-up
Popular calculators
- Mortgage CalculatorYour full monthly house payment: principal, interest, taxes, insurance, PMI and HOA.
- Loan CalculatorMonthly payment, total interest and total cost for any fixed-rate loan.
- Paycheck CalculatorTake-home pay after federal withholding, Social Security and Medicare.
- Salary CalculatorConvert pay between hourly, weekly, monthly and annual.
- GPA CalculatorSemester and cumulative GPA, weighted or unweighted, for up to 8 courses.
- Percentage CalculatorPercent of a number, what percent one number is of another, and percent change.
- BMI CalculatorBody mass index for adults, the CDC category, and the healthy weight range for your height.
- Calorie CalculatorDaily calories to maintain your weight, or to lose or gain it gradually, with safe minimums.
All calculators
Finance 22
- 401(k) Calculator
- Amortization Calculator
- Annuity Calculator
- Auto Loan Calculator
- CD Calculator
- Compound Interest Calculator
- Credit Card Payoff Calculator
- Debt Payoff Calculator
- HELOC Calculator
- How Much House Can I Afford?
- Inflation Calculator
- Investment Calculator
- Loan Calculator
- Mortgage Calculator
- Present Value Calculator
- Refinance Calculator
- Rent vs Buy Calculator
- Retirement Calculator
- Roth IRA Calculator
- Savings Calculator
- Simple Interest Calculator
- Student Loan Calculator