SI derived unit

An SI derived unit is a unit of measurement that can be expressed as a combination of one or more SI base units. A unit that is dimensionless is also called a derived unit. There are special names for 22 of these units.

Named units derived from SI base units

Name	Symbol	Quantity	Definition other units	Definition SI base units
radian	rad	plane angle		−
steradian	sr	solid angle		−
hertz	Hz	frequency		s−1
newton	N	force, weight		m⋅kg⋅s−2
pascal	Pa	pressure, stress	N/m2	m−1⋅kg⋅s−2
joule	J	energy, work, heat	N⋅m	m2⋅kg⋅s−2
watt	W	power, radiant flux	J/s	m2⋅kg⋅s−3
coulomb	C	electric charge		s⋅A
volt	V	voltage, electrical potential difference, electromotive force	W/A J/C	m2⋅kg⋅s−3⋅A−1
farad	F	electrical capacitance	C/V	m−2⋅kg−1⋅s4⋅A2
ohm	Ω	electrical resistance, impedance, reactance	V/A	m2⋅kg⋅s−3⋅A−2
siemens	S	electrical conductance	1/Ω	m−2⋅kg−1⋅s3⋅A2
weber	Wb	magnetic flux	J/A	m2⋅kg⋅s−2⋅A−1
tesla	T	magnetic field strength	Wb/m2 V⋅s/m2 N/(A⋅m)	kg⋅s−2⋅A−1
henry	H	inductance	Wb/A V⋅s/A	m2⋅kg⋅s−2⋅A−2
degree Celsius	°C	temperature relative to 273.15 K	TK − 273.15	K
lumen	lm	luminous flux	cd⋅sr	cd
lux	lx	illuminance	lm/m2	m−2⋅cd
becquerel	Bq	radioactivity (decays per unit time)		s−1
gray	Gy	absorbed dose (of ionizing radiation)	J/kg	m2⋅s−2
sievert	Sv	equivalent dose (of ionizing radiation)	J/kg	m2⋅s−2
katal	kat	catalytic activity		s−1⋅mol