Calculators & Units

Finance, health, percentage, and unit math with transparent formulas.

Percent of, change, and reverse percent.

Split a bill with tip and per-person totals.

Compute BMI from metric or imperial inputs.

Estimate payment, interest, and total cost.

Project growth with compound frequency.

Sale price, discount, markup, and margin.

Convert metric and imperial lengths.

Convert mass units.

Convert C, F, and K.

Convert bits and bytes across prefixes.

Exact age in years, months, and days.