Units of Measurement

A
ampere	A
ampere-hour	Ah
ampere-turn	Atr
Top
B
bar	bar
British thermal unit	Btu
Top
C
calorie	cal
candela	cd
centimetre	cm
square centimetre	cm2
cubic centimetre	cm3
centimetre per second	cm/s
circular mil	CM
one thousand circular mils	MCM
coulomb	C
Top
D
decibel	dB
decilitre	dl
decimetre	dm
degree Celsius	oC
degree Fahrenheit	oF
dyne	dyn
Top
E
electron-volt	eV
Top
F
farad	F
foot	ft
foot per minute	ft/min
foot per second	ft/s
cubic foot	ft3
cubic foot per minute	ft3/min
cubic foot per second	ft3/s
square foot	ft2
footcandle (see lumens per square foot)	fc
foot-pound	ft-lb
Top
G
gallon	gal
Imperial gallon	UK gal
United States gallon	US gal
gigahertz	GHz
gigajoule	GJ
gigawatt	GW
gram	g
gram per square centimetre	g/cm2
Top
H
hertz	Hz
horsepower	hp
metric horsepower
hour	h
Top
I
inch	in
cubic inch	in3
square inch	in2
inch-pound	in-lb
Top
J
joule	J
Top
K
kelvin	K
kilogram	kg
kilogram per centimetre	kg/cm
kilohertz	kHz
kilojoule	kJ
kilolitre	kl
kilometre	km
kilometre per hour	km/h
kilopascal	kPa
kilopound	klb
kilopound per square inch	klb/in2
kilopound-inch	klb-in
kilovar	kvar
kilovolt	kV
kilovoltampere	kVA
kilowatt	kW
kilowatthour	kWh
L
litre	l
litre per minute	l/min
litre per second	l/s
lumen	lm
lumen per square foot	lm/ft2
lux	lx
Top
M
megahertz	MHz
megajoule	MJ
megavar	Mvar
megawatt	MW
megohm	MΩ
metre	m
cubic metre	m3
square metre	m2
metre per minute	m/min
metre per second	m/s
metric horsepower
microampere	µA
micrometre (micron)	µm
mil	mil
circular mil	CM
thousands circular mill	MCM
mile	mi
square mille	mi2
mile per hour	mi/h
mill	mill
milliampere	mA
milligram	mg
millilitre	ml
millimetre	mm
cubic millimetre	mm3
square millimetre	mm2
minute (angle)	'
minute (time)	min
Top
N
newton	N
Top
O
ohm	Ω
ounce	oz
Top
P
pascal	Pa
pint
pound	lb
pound per square foot	lb/ft2
pound per cubic foot	lb/ft3
pound per square inch	lb/in2
pound-foot (see foot-pound)
Top
R
radian	rad
radian per second	rad/s
revolutions per minute	RPM
Top
S
second (angle)	"
seconde (time)	s
Top
T
terawatt	TW
metric ton	MT
short ton	ST
statute ton
Top
U
British thermal unit	BTU
Top
V
var	var
volt	V
Top
W
watt	W
watthour	Wh
week	wk
Top
Y
yard	yd
cubic yard	yd3
square yard	yd2

Top

Multiples and sub-multiples of the decimal system

The prefixes below are used to express the multiples commonly used—kilowatthours (kWh), megawatts (MW), kilovolts (kV), etc.—when we talk about the generation, transmission, distribution or consumption of electricity:

	Prefix	Symbol
10 = 101	deca	da
100 = 102	hecto	h
1,000 = 103	kilo	k
1,000,000 = 106	mega	M
1,000,000,000 = 109	giga	G
1,000,000,000,000 = 1012	tera	T
1,000,000,000,000,000 = 1015	peta	P
1,000,000,000,000,000,000 = 1018	exa	E
0.1 = 10-1	deci	d
0.01 = 10-2	centi	c
0.001 = 10-3	milli	m
0.000 001 = 10-6	micro	µ
0.000 000 001 = 10-9	nano	n
0.000 000 000 001 = 10-12	pico	p
0.000 000 000 000 001 = 10-15	femto	f
0.000 000 000 000 000 001 = 10-18	atto	a

Top