Derived Units

Amount Electric Current Luminosity Mass Temperature Time Length SI Units About Mole Mole Ampere Ampere Metre Metre Candela Candela Kilogram Kilogram Kelvin Kelvin Second Second
The seven SI base units are used to form all other units of measurement used in science and technology. These are called SI derived units and are listed in the table below. Note that the names of SI units are always written in lower-case letters, but that unit symbols named after people usually have the first or only letter in upper-case. Derived units with worked examples found in this series of pages are shown in blue links.
Derived Units
becquerel Bq radioactivity (decays per units time)   1/s s-1 coulomb C electric charge or quantity of electricity s•A s•A degree Celsius °C temperature relative to 273.15 K   K farad F electric capacitance C/V kg−1•m−2•s4•A2 gray Gy absorbed dose of ionizing radiation   J/kg m2•s−2 henry H inductance   V•s/A = Wb/A  kg•m2•s−2•A−2 hertz Hz frequency   1/s s-1 joule J energy, work, heat N•m = C•V = W•s   kg•m2•s−2 katal kat catalytic activity   mol/s s-1•mol lumen lm luminous flux cd•sr cd lux lx illuminance lm/m2  m-2•cd newton N force, weight kg•m/s2 kg•m•s−2 ohm Ω electric resistance, impedance, reactance V/A kg•m2•s−3•A−2 pascal Pa pressure, stress N/m2 kg•m−1•s−2 radian rad angle m/m dimensionless siemens S electrical conductance 1/Ω = A/V   kg−1•m−2•s3•A2 sievert Sv equivalent dose of ionizing radiation J/kg m2•s−2 steradian sr solid angle   m2/m2 dimensionless tesla T magnetic field strength, V•s/m2 magnetic flux density = Wb/m2 kg·s−2•A−1 = N/(A•m) volt V voltage, electrical potential difference, W/A = J/C kg•m2•s−3•A−1 electromotive force watt W power, radiant flux J/s = V•A kg•m2•s−3 weber Wb magnetic flux J/A kg•m2•s−2•A−1
Expression Expression Name Symbol   Quantity in terms of in terms of SI other units base units
Some other units are not derived SI units but commonly accepted, such as the litre.
Derived Units
Unit Conversions

Derived Units

Amount Electric Current Luminosity Mass Temperature Time Length SI Units About
The seven SI base units are used to form all other units of measurement used in science and technology. These are called SI derived units and are listed in the table below. Note that the names of SI units are always written in lower-case letters, but that unit symbols named after people usually have the first or only letter in upper-case. Derived units with worked examples found in this series of pages are shown in blue links.
becquerel Bq radioactivity (decays per units time)   1/s s-1 coulomb C electric charge or quantity of electricity   s•A  s•A degree Celsius °C temperature relative to 273.15   K   K farad F electric capacitance C/V  kg−1•m−2•s4•A2 gray Gy absorbed dose of ionizing radiation   J/kg m2•s−2 henry H inductance   V•s/A = Wb/A  kg•m2•s−2•A−2 hertz Hz frequency   1/s s-1 joule J energy, work, heat N•m = C•V = W•s   kg•m2•s−2 katal kat catalytic activity   mol/s s-1•mol lumen lm luminous flux cd•sr cd lux lx illuminance lm/m2  m-2•cd newton N force, weight kg•m/s2 kg•m•s−2 ohm Ω electric resistance, impedance, reactance V/A kg•m2•s−3•A−2 pascal Pa pressure, stress N/m2 kg•m−1•s−2 radian rad angle m/m dimensionless siemens S electrical conductance 1/Ω = A/V   kg−1•m−2•s3•A2 sievert Sv equivalent dose of ionizing radiation J/kg m2•s−2 steradian sr solid angle   m2/m2 dimensionless tesla T magnetic field strength/flux density V•s/m2 = Wb/m2 = N/(A•m) kg·s−2•A−1 volt V voltage, potential diff, electromotive force W/A = J/C  kg•m2•s−3•A−1 watt W power, radiant flux J/s = V•A kg•m2•s−3 weber Wb magnetic flux J/A kg•m2•s−2•A−1
Some other units are not derived SI units but commonly accepted, such as the litre.
Derived Units
The derived units shown below are given by name, symbol and quantity, as well as in terms of other units (in dark red) and then in terms of SI base units (in dark blue).