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28 calculators for finance, math, health, and engineering
All calculations run in your browser — no data leaves your device.
Find what percent, percentage change, add or subtract percentages.
Open toolCalculate body mass index with BMR and TDEE estimates.
Open toolExact age in years, months, days with birthday countdown.
Open toolMonthly payments, total interest, and amortization schedule.
Open toolMonthly payment, total cost, and amortization with taxes and insurance.
Open toolSee how investments grow over time with compound interest.
Open toolCalculate gross, net, and operating profit margins.
Open toolAdd or reverse-calculate sales tax for any rate.
Open toolAdd or remove GST/VAT from any amount.
Open toolCalculate tip amounts and split bills between people.
Open toolFind sale price, savings, and discount percentage.
Open toolROI, annualized return, and total gain/loss.
Open toolEstimate take-home pay after federal and state taxes.
Open toolSee how purchasing power changes over time.
Open toolUnit price comparison and cost breakdown.
Open toolCalculate weighted and unweighted GPA from grades.
Open toolSimple arithmetic with expression evaluation.
Open toolTrig, log, powers, constants, and more.
Open toolAdd, subtract, multiply, divide, and simplify fractions.
Open toolMean, median, mode, range, and standard deviation.
Open toolArea and perimeter for 6 common shapes.
Open toolVolume and surface area for 5 solid shapes.
Open toolCalculate voltage, current, resistance, and power.
Open toolIdeal body weight using multiple medical formulas.
Open toolSolve for speed, distance, or time.
Open toolEstimate fuel cost for any trip distance.
Open toolCalculate energy cost from wattage and usage hours.
Open toolDays between dates, add/subtract days from a date.
Open toolYes — every calculator is verified against known-correct values with automated tests on every build. We currently run 451 formula tests.
Absolutely. All calculations happen in your browser. No data is sent to any server.
Yes, all calculators are fully responsive and work on phones, tablets, and desktops.
No. All tools are free and require no sign-up or login.