Free Online Unit Converters

Convert length, weight, temperature, currency, speed and more — instantly. No sign-up required.

All Conversion Tools

Convert length and distance units instantly.

Convert weight and mass units in real time.

Convert between Celsius, Fahrenheit, and Kelvin instantly.

Convert area units including square meters, acres, hectares, square feet and square kilometers.

Convert volume units including liters, gallons, milliliters, cups, and pints instantly.

Convert speed units including kilometers per hour, miles per hour, meters per second, and knots.

Convert time units from milliseconds to years.

Convert pressure units including Pascal, bar, PSI, and atmospheres instantly.

Convert energy units including joules, calories, kilowatt-hours and BTU instantly.

Convert power units including watts, kilowatts, megawatts and horsepower instantly.

Convert digital storage units from bits to terabytes.

Convert frequency units including hertz, kilohertz, megahertz, gigahertz and RPM.

Convert fuel economy between miles per gallon, kilometers per liter and liters per 100km.

Convert angle units between degrees, radians and gradians instantly.

Convert cooking measurements including cups, tablespoons, teaspoons, milliliters and fluid ounces.

Convert numbers between binary, decimal, hexadecimal and octal bases instantly.

Calculate your Body Mass Index using metric or imperial measurements.

Calculate your exact age in years, months and days from your date of birth.

Convert times between major world time zones including UTC, GMT, EST, PST, IST and more.