ConstantID

Unit converter

Conversion factors for the quantities physicists and engineers use most. Units such as the inch, pound, calorie and atmosphere are defined exactly in SI units; the atomic mass unit, hartree, rydberg and bohr are CODATA 2022 values and carry their measured uncertainty.

Conversion tables

Lengthm, km, cm, mm, µm, nm and 11 more Masskg, g, mg, µg, t, lb and 8 more Times, ms, µs, ns, ps, fs and 5 more TemperatureK, °C, °F, °R EnergyJ, kJ, MJ, eV, keV, MeV and 11 more PowerW, mW, kW, MW, hp, PS and 3 more PressurePa, hPa, kPa, MPa, bar, mbar and 5 more ForceN, kN, mN, dyn, lbf, kgf and 1 more Speedm/s, km/h, mph, kn, ft/s, km/s and 2 more Aream², cm², km², ha, acre, ft² and 3 more Volumem³, L, mL, cm³, gal (US), gal (UK) and 3 more FrequencyHz, kHz, MHz, GHz, THz, rpm Electric chargeC, mC, µC, nC, e, A·h and 2 more VoltageV, mV, kV, statV Magnetic flux densityT, mT, µT, G

Constants in other units