Free health & finance calculators — plus handy online tools

Free BMI, BMR, body fat, and interest calculators with inflation adjustment — plus a keyboard tester, mouse tester, realtime clock, and IP lookup.

Health Calculators

Health

BMI Calculator

Calculate Body Mass Index and weight category.

Health

BMR Calculator

Estimate basal metabolic rate and daily calorie needs.

Health

Body Fat Calculator

Estimate body fat % using the U.S. Navy circumference method.

Interest Rate Calculators

All interest calculators support inflation and deflation adjustment for real money value.

Interest

Deposit Interest Calculator

Compound growth on savings with inflation adjustment.

Interest

Lending Rate Calculator

Monthly loan payments and total interest cost.

Interest

Fixed Interest Calculator

Future value of a fixed-rate investment.

Interest

Variable Interest Calculator

Year-by-year variable rates with inflation.

Interest

Prime Rate Calculator

Loan cost using prime rate plus spread.

Interest

Nominal Interest Calculator

Convert real rate to nominal using inflation.

Interest

Real Interest Calculator

Fisher equation: real rate from nominal and inflation.

Interest

Compound Interest Calculator

Compound growth with inflation-adjusted real value.

Utility Tools

Test your hardware and check your connection — right in the browser.

Tools

Keyboard Tester

Test every key on your keyboard with a live visual layout.

Tools

Mouse Tester

Test mouse buttons, scroll wheel, and double-click speed.

Tools

Realtime Clock

Live clock with millisecond precision, stopwatch, and timer.

Tools

What Is My IP

See your public IP address and its location on a map.