Quantity	Name	Symbol
Length	meter, metre	m
Mass	kilogram	kg
Time	second	s
Electric Current	ampere	A
Temperature	kelvin	K
Amount of Substance	mole	mol

Quantity	Name	Formula	Special Symbol
Area	square metre	m2	-
Volume	cubic metre	m3	-
Velocity	metre per second	m/s	-
Density	kilogram per cubic metre	kg/m3	-
Concentration	moles per cubic metre	mol/m3	-
Force	newton	kg-m/s2	N
Energy	joule	kg-m2/s2, N-m	J
Stress	pascal	kg/m-s2, N/m2	Pa
Strain	-	m/m	-
Power, radiant flux	watt	kg-m2/s3, J/s	W
Viscosity	pascal-second	kg/m-s	Pa-s
Frequency	hertz	s-1	Hz
Electric Charge	coulomb	A-s	C
Electric potential	volt	kg-m2/s2-C	V
Capacitance	farad	s2-C/kg-m2	F
Electric Resistance	ohm	kg-m2/s-C2	Ω
Magnetic flux	weber	kg-m2/s-C	Wb
Magnetic flux density	tesla	kg/s-C, Wb/m2	T

Factor	Prefix	Symbol
1021	zetta	Z
1018	exa	E
1015	peta	P
1012	tera	T
109	giga	G
106	mega	M
103	kilo	k
10-2	centi	c
10-3	milli	m
10-6	micro	μ
10-9	nano	n
10-12	pico	p
10-15	femto	f
10-18	atto	a
10-21	zepto	z

Quantity	Conversion Factors
Length	1 mm = 0.03937008 inch 1 m = 3.280839895 ft 1 m = 1.093613298 yard 1 inch = 25.4 mm 1 ft = 0.3048 m 1 yard = 0.9144 m
Area	1 m2 = 10.76391042 ft 2 1 ft2 = 0.09290304 m2
Volume	1 m3 = 35.31466672 ft3 1 ft3 = 0.028316847 m3
Mass	1 kg = 2.20462262 lb 1 lb = 0.45359237 kg
Density	1 kg/m3 = 10-3 g/cm3 1 lb/ft3 = 16.02 kg/m3
Force	1 N = 0.2248 lb 1 lb = 4.448 N
Stress	1 MPa = 145 psi 1 psi = 0.0069 MPa
Energy	1 J = 0.239 cal 1 J = 0.000948 Btu
Temperature	T(K) = 273 + T(°C) T(K) = (5/9)[T(°F) - 32] + 273 T(°C) = (5/9)[T(°F) - 32]