Standard Units

Unit	Symbol	Definition	Comments
Standard Units
Time
second	sec	1 s
minute	min	60 s
hour	hr	60 min
hour	hour	1 hr	alternate symbol
hour	h	1 hr	alternate symbol
day	day	24 hr
shake	shake	10 ns
Hertz	Hz	1 s^-1
Length or Distance
international foot	ft	0.3048 m
inch	in	1.0/12.0 ft
international mile	mile	5280.0 ft
international mile	mi	1 mile	alternate symbol
milli-inch	mil	0.001 in
Parsec	pc	3.085678e16 m
League	league	3 mile
Astronomical Unit	ua	1.49598e11 m
Astronomical Unit	AU	1.49598e11 m	alternate symbol
yard	yd	3 ft
Angstrom	Ang	1e-10 m
Angstrom	\\AA	1 Ang	alternate symbol
furlong	furlong	220 yd
fathom	fathom	6 ft
Rod	rd	16.5 ft
U.S. survey foot	sft	(1200./3937.) m
U.S. survey mile	smi	5280 sft	also called statue mile
point	pt	1./72. in	Typeface Point
pica	pica	1./6. in	Typeface Pica
Temperature
Celsius	C	1 K -273.15
Rankine	R	5.0/9.0 K
Fahrenheit	F	1 R -459.67
Mass
gram	g	0.001 kg	This is case sensitive.
gram	gm	g	(alternate symbol)
pound mass	lbm	0.45359237 kg	(avoirdupois)
Troy pound	lbt	0.3732417 kg	(apothecary)
carat (metric)	carat	0.2 g
slug	slug	1 lb sec^2/ft
snail	snail	1 lb sec^2/in
Short Ton	ton	2000 lbm
Long Ton	ton_l	2240 lbm
Ounce	oz	28.34952 g	(avoirdupois)
Grain	gr	64.79891 mg
Pennyweight	dwt	1.55174 g
Force or Weight
Newton	N	1 kg m/s^2
Dyne	dyn	1e-5 N
pound force	lb	lbm G
pound force	lbf	lbm G
poundal	poundal	1 lbm ft/sec^2
kilopound	kip	1000 lbf
kilogram force	kgf	kg G
Energy
Joule	J	1 N m
British Therm. Unit	BTU	1055.056 J	(International Table)
British Therm. Unit	Btu	1 BTU	alternate symbol
British Therm. Unit	BTU_th	1054.350 J	(Thermochemical)
calorie	cal	4.1868 J	(International Table)
calorie	cal_th	4.184 J	(Thermochemical)
Calorie	Cal	4.1868 kJ	(nutritionists)
electron volt	eV	1.602177e-19 J
erg	erg	1e-7 J
Ton of TNT	TNT	4.184e9 J
Power
Watt	W	1 J/s
Horse Power	hp	550 ft lb/s
Pressure
bar	bar	1e5 N/m^2
Pascal	Pa	1 N/m^2
Pounds per sq. inch	psi	1 lb/in^2
Pounds per sq. ft.	psf	1 lb/ft^2
kilo psi	ksi	1000.0 psi
atmospheres	atm	1.01325e5 N/m^2
inches of Mercury	inHg	3.387 kPa
millimeters Mercury	mmHg	0.1333 kPa
Torr	torr	1.333224 Pa
Volume or Area
Liter	L	1/1000.0 m^3
gallon	gal	3.785412 L
Pint (U.S. liquid)	pint	1/8. gal
Quart (U.S. liquid)	qt	2 pint
Pint (U.S. dry)	dpint	0.5506105 L
Quart (U.S. dry)	dqt	2 dpint
Acre	acre	1/640.0 smi^2
Hectare	ha	10000 m^2
Barrel (petroleum)	barrel	158.9873 L
Fluid Ounce	oz_fl	29.57353 mL
Gill (U.S.)	gi	0.1182941 L
Peck (U.S.)	pk	8.809768 L
Tablespoon	tbl	1/32. pint
Teaspoon	tsp	1/3. tbl
Cup	cup	16. tbl
Electromagnetism
Coulomb	Co	1 A s	Electric Charge
Volt	V	1 W/A	Electric Potential
Ohm	ohm	1 V/A	Electric Resistance
Ohm	\\Omega	1 V/A	alternate symbol
Faraday	faraday	96485.31 Co	Electric Charge
Farad	farad	Co/V	Capacitance
Stokes	stokes	1e-4 m^2/s
Oersted	Oe	79.57747 A/m
Webber	Wb	V s	Magnetic flux
Tesla	Tesla	Wb/m^2	Magnetic flux density
Henry	H	Wb/A	Inductance
Siemens	S	A/V	Electrical Conductance
Light and Radiation
Lux	lux	cd/m^2	Iluminance
Lux	lx	cd/m^2
Lumen	lm	cd	Luminous Flux
Stilb	sb	10000 cd/m^2
Phot	ph	10000 lx
Becquerel	Bq	s^-1	activity
Gray	Gy	J/kg	Absorbed Dose, kerma
Sievert	Sv	J/kg	Dose equivalent
Other Quantities
pound mole	lbmole	1 mol lbm/g	quantity
poise	poise	1 g /sec cm	viscocity
Gravity's accel.	G	9.80665 m/sec^2	Gravity on Earth
Degree	deg	Pi/180	Can be used to convert from degrees to radians for trig functions.
Percent	%	0.01
Knot	knot	1852 m/hr	velocity
Miles per Hour	mph	1 mi/hr	velocity
Gallon/minute	gpm	1. gal/min	flow rate
Revolution/minute	rpm	360 deg/min