Length, mass, temperature, speed, volume, energy…
14 unit categories based on the International System of Units (SI). Precise, instant, and free conversions.
The most commonly used units in everyday life. Click to open the dedicated converter.
Convert lengths: mm, cm, m, km, inch, foot, mile, nautical mile…
Convert masses: mg, g, kg, tonne, ounce, pound…
Convert temperatures: Celsius, Fahrenheit, Kelvin, Rankine.
Convert speeds: m/s, km/h, mph, knot…
Convert volumes: mL, L, m³, gallon, pint…
Convert energy: J, kJ, cal, kcal, Wh, kWh, BTU, eV…
Three steps to convert any unit.
Select the unit category to convert: length, mass, temperature…
Type the value, choose the source unit and the target unit.
The result appears instantly, calculated according to International System of Units standards.
Convert lengths: mm, cm, m, km, inch, foot, mile, nautical mile…
Convert masses: mg, g, kg, tonne, ounce, pound…
Convert temperatures: Celsius, Fahrenheit, Kelvin, Rankine.
Convert speeds: m/s, km/h, mph, knot…
Convert volumes: mL, L, m³, gallon, pint…
Convert areas: mm², cm², m², hectare, acre, mile²…
Convert angles: radian, degree, gradian, turn, arcminute, arcsecond.
Convert fuel consumption: L/100km, km/L, US mpg, UK mpg.
Convert data rates: bit/s, kbit/s, Mbit/s, Gbit/s, byte/s…
Convert frequencies: Hz, kHz, MHz, GHz, rpm…
Convert pressures: Pa, hPa, kPa, bar, atm, mmHg, psi…
Convert sizes: bit, byte, KiB, MiB, GiB, as well as kB, MB, GB (SI).
Convert durations: ms, s, min, h, day, week, month, year…
Convert energy: J, kJ, cal, kcal, Wh, kWh, BTU, eV…