Free Online Calculators

Calculate Anything, Instantly

Practical calculators for finance, health, and everyday math. No signup, no ads interrupting your results — just accurate answers.

Compound Interest Calculator

See how your money grows over time with compound interest. Enter principal, rate, frequency, and time — get a full year-by-year breakdown.

Calculate your Body Mass Index instantly. Supports both metric (kg/cm) and imperial (lbs/ft) units. WHO standard weight categories included.

Three calculation modes: find X% of a number, calculate what percentage X is of Y, or compute the percentage change between two values.

Calculate monthly payments, total interest, and the full amortization schedule for any loan — mortgage, car loan, personal loan, or student loan.

Calculate your exact age in years, months, and days. Find out how many days until your next birthday and what day of the week you were born.

Find out what a past amount is worth in today's money, or project future purchasing power using a custom inflation rate.

All calculators are free and work entirely in your browser. No data is stored or sent to any server.