Free Online Unit Converter

Convert between thousands of units instantly. Fast, accurate, and completely free. No registration required.

All Unit Categories

Choose from our comprehensive collection of unit converters across multiple categories

Length & Distance

Convert meters, feet, inches, kilometers, miles, yards and more

15+ units

Weight & Mass

Convert kilograms, pounds, ounces, grams, tons and more

12+ units

Temperature

Convert Celsius, Fahrenheit, Kelvin, Rankine and more

8+ units

Area

Convert square meters, acres, hectares, square feet and more

10+ units

Volume

Convert liters, gallons, cups, milliliters, cubic meters and more

18+ units

Time

Convert seconds, minutes, hours, days, weeks, years and more

12+ units

Speed

Convert mph, km/h, m/s, knots, mach and more speed units

10+ units

Energy & Power

Convert joules, calories, watts, BTU, horsepower and more

15+ units

Pressure

Convert Pascal, PSI, bar, atmosphere, torr and more

12+ units

Digital Storage

Convert bytes, KB, MB, GB, TB and more storage units

10+ units