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The SI System


Units shown in green are the basic SI units, those in purple are derived from the basic units

The term SI comes from the French description - Systeme International d'Unites

length metre m
mass kilogram kg
time second s
electric current ampere A
temperature kelvin K
amount of substance mole mol
luminous intensity candela cd
plane angle radian rad
solid angle steradian sr
electric charge coulomb C
electric capacitance farad F
illumination lux lx
luminous flux lumen lm
energy joule J
force newton N
power watt W
pressure pascal Pa
frequency hertz Hz
magnetic flux weber Wb
Magnetic flux density tesla T
electromotive force volt V
current ampere I
resistance ohm O
electric conductance siemens S
inductance henry H

Units shown in green are basic SI units,those in purple are derived units

The term SI comes from the French description - Systeme International d'Unites

Non- SI units still in common use (Mainly in the USA) are the Pounds per Square Inch (PSI) for pressure, BTU for energy and the Footcandles for Illumination.

Note: Find conversion factors for PSI, BTU and Footcandles on the convert page.

 

 

 

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