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Free online calculators for finance, health, business, construction, education, engineering and everyday life.
Popular calculators
The tools people reach for most often.
Mortgage Calculator
Estimate your monthly mortgage payment, total interest and full amortization schedule from home price, down payment, rate and term.
Calculate FinanceLoan Calculator
Work out monthly repayments, total cost and interest for any fixed-rate personal, auto or student loan.
Calculate FinanceCompound Interest Calculator
See how savings grow with compounding, regular contributions and time — with a year-by-year growth chart.
Calculate HealthBMI Calculator
Calculate Body Mass Index in metric or imperial units and see the WHO weight category for your result.
Calculate NutritionCalorie Calculator
Estimate basal metabolic rate and daily calorie needs using the Mifflin-St Jeor equation and your activity level.
Calculate MathPercentage Calculator
Solve every common percentage question: percent of a number, percentage change, and what percent one number is of another.
Calculate TaxesSales Tax Calculator
Add sales tax to a pre-tax price, or work backwards from a total to find the price before tax, at any state or local rate.
Calculate RetirementRetirement Calculator
Project your retirement savings from your current balance, contributions, employer match and expected return.
Calculate TaxesSalary & Paycheck Tax Calculator
Estimate take-home pay with a progressive income tax breakdown, bracket by bracket.
Calculate TimeAge Calculator
Calculate exact age or the duration between any two dates in years, months, days, hours and minutes.
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Deep tools with charts, schedules and breakdowns.
Mortgage Calculator
Estimate your monthly mortgage payment, total interest and full amortization schedule from home price, down payment, rate and term.
Open calculatorLoan Calculator
Work out monthly repayments, total cost and interest for any fixed-rate personal, auto or student loan.
Open calculatorCompound Interest Calculator
See how savings grow with compounding, regular contributions and time — with a year-by-year growth chart.
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From the blog
Guides that explain the math behind the tools.
How Mortgage Payments Work
Why your first mortgage payment is almost all interest, how amortization shifts over time, and what overpaying really saves.
6 min readHealthWhat Is BMI, and What It Cannot Tell You
BMI is a screening tool, not a diagnosis. Here is what the number means, where it works, and where it misleads.
5 min readFinanceCompound Interest Explained
Why the last decade of a savings plan usually produces more growth than the first two, and how to model it honestly.
6 min read