The SI units

Basic units

QuantityUnitSymbol
Length metre m
Mass kilogram kg
Time second s
Therm. temp. kelvin K
Electr. current ampere A
Luminous intens.candela cd
Amount of subst.mol mol

Extra units

QuantityUnitSymbol
Plane angle radian rad
solid angle sterradiansr

Derived units with special names

QuantityUnitSymbolDerivation
Frequency hertz Hz \(\rm s^{-1}\)
Force newton N \(\rm kg\cdot m\cdot s^{-2}\)
Pressure pascal Pa \(\rm N\cdot m^{-2}\)
Energy joule J \(\rm N\cdot m\)
Power watt W \(\rm J\cdot s^{-1}\)
Charge coulomb C \(\rm A\cdot s\)
El.\ Potential volt V \(\rm W\cdot A^{-1}\)
El.\ Capacitance farad F \(\rm C\cdot V^{-1}\)
El.\ Resistance ohm \(\Omega\)\(\rm V\cdot A^{-1}\)
El.\ Conductance siemens S \(\rm A\cdot V^{-1}\)
Mag.\ flux weber Wb \(\rm V\cdot s\)
Mag.\ flux density tesla T \(\rm Wb\cdot m^{-2}\)
Inductance henry H \(\rm Wb\cdot A^{-1}\)
Luminous flux lumen lm \(\rm cd\cdot sr\)
Illuminance lux lx \(\rm lm\cdot m^{-2}\)
Activity bequerelBq \(\rm s^{-1}\)
Absorbed dose gray Gy \(\rm J\cdot kg^{-1}\)
Dose equivalent sievert Sv \(\rm J\cdot kg^{-1}\)

Prefixes

quettaQ\(10^{30}\)
ronnaR\(10^{27}\)
yottaY\(10^{24}\)
zettaZ\(10^{21}\)
exa E\(10^{18}\)
peta P\(10^{15}\)
tera T\(10^{12}\)
giga G\(10^9\)
mega M\(10^6\)
kilo k\(10^3\)
hectoh\(10^2\)
deca d10
deci d\(10^{-1}\)
centic\(10^{-2}\)
millim\(10^{-3}\)
micro\(\mu\)\(10^{-6}\)
nano n\(10^{-9}\)
pico p\(10^{-12}\)
femtof\(10^{-15}\)
atto a\(10^{-18}\)
zeptoz\(10^{-21}\)
yoctoy\(10^{-24}\)
rontor\(10^{-27}\)
quectoq\(10^{-30}\)