Free online calculators that never see your numbers
Paychecks, mortgages, loans, savings and unit conversions. Everything is worked out in your browser, so what you type stays on your device.
What is % of ?
15.3At an hour for hours a week, I earn
$59,280 a yearPick up where you left off
Pay and taxes
Take-home pay, hourly wages and overtime.
Loans and debt
Mortgage, car loan and credit card payoff.
Saving and investing
Growth, retirement and the cost of inflation.
Everyday math
Percentages, discounts, tips and trip costs.
- Discount CalculatorSale price after one or two discounts, with optional tax.
- Percentage CalculatorPercent of a number, percent change, increase and decrease.
- Road Trip Gas CalculatorFuel needed and trip cost in miles or kilometres, split between riders.
- Sales Tax and VAT CalculatorAdd sales tax or VAT to a price, or remove it from a total.
- Tip CalculatorTip, total and the share each person owes.
Unit converters
US customary and metric, both directions.
School and health
GPA and body mass index.
Private by design
Every calculation runs in your browser. There are no accounts and no upload forms, so there is nothing for us to see. Ads come from Google and may use cookies; the privacy policy explains your choices.
Formulas you can check
Each calculator shows its formula, a worked example and its sources. Tax figures follow the IRS 2026 tables and historical inflation comes from the Bureau of Labor Statistics.
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