- online unit conversion - einheiten umrechnen - convertir les unités

Convert units of acceleration, angle, area, energy/work, force, coefficient of heat transfer, length, mass, mass density, mass concentration, power, pressure/stress, time, velocity, viscosity, volume and temperature.

The conversion factors are based on data published in the "Guide for the Use of the International System of Units" by B. N. Taylor of the Physics Laboratory, National Institute of Standards and Technology Gaithersburg, MD20899-0001, 1995.

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Since I am only human, I can't guarantee the correctness of the programmes results! So please check them if there is a risk that incorrect results might cause damage. If you find a bug or if you have any suggestion for improvement, I would be very grateful for writing me.

table of SI units

quantity name symbol
SI base units
length meter m
mass kg kg
time second s
electric current ampere A
thermodynamic temperature kelvin K
amount of substance mole mol
luminous intensity candela cd
SI derived unit
area square meter
volume cubic meter
speed, velocity meter per second m/s
acceleration meter per second squared m/s²
wave number reciprocal meter 1/m
mass density kilogram per cubic meter kg/m³
specific volume cubic meter per kilogram m³/kg
current density ampere per square meter A/m²
magnetic field strength ampere per meter A/m
amount of substance concentration mole per cubic meter mol/m³
luminance candela per square meter cd/m²
SI derived units with special symbols
plane angle radian 1 [rad]
solid angle steradian 1 [sr]
frequency Hertz 1/s [Hz]
force Newton (kg m)/s² [N]
pressure, stress Pascal N/m² [Pa]
energy, work Joule N m [J]
power, radiant flux Watt J/s [W]
electric charge Coulomb s A [C]
electric potential Volt W/A [V]
capacitance Farad C/V [F]
electric resistance Ohm V/A [Ω]
electric conductance Siemens A/V [S]
magnetic flux Weber V s [Wb]
magnetic flux density Tesla Wb/m² [T]
inductance Henry Wb/A [H]
Celsius temperature degree Celsius K [°C]
luminous flux lumen cd sr [lm]
illuminance lux lm/m² [lx]
activity Becquerel 1/s [Bq]
absorbed dose Gray J/kg [Gy]
dose equivalent Sievert J/kg [Sv]

units accepted for use with the SI

time: minute (min), hour (h), day (d)
plane angle: degree (°), minute (‘), second (“)
liter (l, L), metric ton (t), electron volt (eV), atomic mass (u), Neper, bel, shannon and other highly specialised units.

units temporarily accepted for use with the SI

nautical mile, knot, Ångström (Å), are (a), hectare (ha), barn (b), bar (bar), gal (Gal), curie (Ci), roentgen (R), rem (rem)

units not accepted for use with the SI

British thermal unit (Btu), calorie (cal thermochemical), dyne (dyn), erg (erg), fermi (fermi), gamma, gauss (Gs, G), kilogram-force (kgf), lambda (volume), maxwell (Mx), metric carat (metric carat), micron (m), oersted (Oe), parts per billion (ppb), parts per million (ppm), parts per trillion (ppt), phot (ph), poise (P), standard atmosphere (atm), stere (st), stokes (St), stilb (sb), torr (Torr), x unit (xu), gal (Gal), gon (also called grade) (gon), mil, revolution (r), acre, circular mil, square foot (ft²), square inch (in²), square mile (mi²), square yard (yd²), foot poundal, foot pound-force (ft lbf), quad , therm, ton of TNT (energy equivalent), kilogram-force (kgf), kilopond (kilogram-force) (kp), kip, ounce-force (ozf), poundal, pound-force (lbf), ton-force (2000 lbf), astronomical unit (AU), chain (ch), fathom, foot (ft), inch (in), light year (l.y.), microinch, micron (m), mil (0.001 in), mile, parsec (pc), pica (computer) (1/ 6 in), pica (printer's), point (computer) (1/ 72 in), point (printer's), rod (rd), yard (yd), carat, grain (gr), hundredweight (long, 112 lb), hundredweight (short, 100 lb), ounce (oz), ounce, pennyweight (dwt), pound (lb), slug (slug), ton assay (AT), ton long (2240 lb), horsepower, atmosphere (atm), centimeter of mercury (mmHg), centimeter of water conventional (cmH2O), centipoise (cP), centistokes (cSt), barrel (bbl), bushel (bu), cord, cup, fluid ounce (fl oz), gallon (gal), gill (gi), peck (pk), pint (dry pt), pint (liq pt), quart (dry qt), quart (liq qt), tablespoon, teaspoon, stone, Fahrenheit (°F), Rankine (°R)