Unit catalog

This is the complete catalog of non-currency units: 237 entries (atomic units, compound fuel-economy forms, and special temperature units). Currencies live in their own catalog of 166 ISO codes.

Every entry lists its catalog id, display label, explicit input aliases, the SI prefixes its atom declares, and its dimension signature. Plural forms and prefixed forms are generated from this data — see the units reference for the rules. Use the filter above the table to jump to a unit by name or alias.

Reading the table

• id — the stable catalog identifier (never shown in the answer column).
• label — the display form of the unit.
• explicit aliases — additional input spellings declared for the atom; case matters (MB ≠ Mb), and the label itself is always accepted.
• SI prefixes — the prefix glyphs this atom accepts (— means none); prefixed forms such as km are generated from this list, not listed.
• dimension — the dimension signature that must match for conversions and addition.

The rules for building and converting quantities are in Units & quantities.

All 237 units

id	label	explicit aliases	SI prefixes	dimension
meter	m	m · meter · meters · metre · metres	p,n,µ,m,c,d,k,K,M,G,T	L
kilometer	km	km · kilometer · kilometers	—	L
inch	in	in · inch · inches · in.	—	L
foot	ft	ft · foot · feet	—	L
yard	yd	yd · yard · yards	—	L
mile	mi	mi · mile · miles	—	L
nautical-mile	nmi	nmi · nautical mile · international nautical mile	—	L
mil	mil	mil · mils · thou · thous	—	L
astronomical-unit	AU	AU · au · astronomical unit	—	L
light-year	ly	ly · light year · light-year	—	L
parsec	pc	pc · parsec · parsecs	—	L
angstrom	Å	Å · angstrom · angstroms	—	L
micron	µm	µm · micron · microns	—	L
hand	hand	hand · hands	—	L
us-survey-foot	US ft	US ft · us survey foot · survey foot	—	L
fathom	fathom	fathom · fathoms	—	L
rod	rod	rod · rods · pole · poles	—	L
chain	chain	chain · chains	—	L
furlong	furlong	furlong · furlongs · fur	—	L
pixel	px	px · pixel · pixels	—	—
density-kg-m3	kg/m³	kg/m³ · kg/m3 · kilogram per cubic meter	—	L3·M·T-3
density-g-l	g/L	g/L · g/l · gram per liter	—	L3·M·T-3
density-g-cm3	g/cm³	g/cm³ · g/cm3 · g/mL · g/ml · gram per milliliter	—	L3·M·T-3
density-lb-ft3	lb/ft³	lb/ft³ · lb/ft3 · pound per cubic foot	—	L3·M·T-3
type-point	pt (type)	pt (type) · typographic point · type point	—	L
pica	pica	pica · picas · type pica	—	L
sq-meter	m²	m² · m2 · square meter · square metre · sq m · sqm	m,c,k,K,M	L2
hectare	ha	ha · hectare · hectares	—	L2
acre	acre	acre · acres	—	L2
sq-foot	ft²	ft² · ft2 · square foot · square feet · sq ft · sqft	—	L2
sq-inch	in²	in² · in2 · square inch · sq in	—	L2
sq-yard	yd²	yd² · yd2 · square yard	—	L2
sq-mile	mi²	mi² · mi2 · square mile	—	L2
are	are	are	—	L2
rood	rood	rood · roods	—	L2
barn	barn	barn · barns	—	L2
section	section	section · sections	—	L2
liter	L	L · l · liter · litre · liters · litres	µ,c,d,k,K	L3
milliliter	ml	ml · mL · milliliter · milliliters	—	L3
cubic-meter	m³	m³ · m3 · cubic meter · cubic metre	k,K,M	L3
cubic-inch	in³	in³ · in3 · cubic inch	—	L3
cubic-foot	ft³	ft³ · ft3 · cubic foot · cubic feet	—	L3
cubic-yard	yd³	yd³ · yd3 · cubic yard	—	L3
us-teaspoon	tsp	tsp · teaspoon · teaspoons · us teaspoon	—	L3
metric-teaspoon	metric tsp	metric teaspoon · metric tsp	—	L3
us-tablespoon	tbsp	tbsp · tablespoon · tablespoons · us tablespoon	—	L3
us-fluid-ounce	fl oz	fl oz · us fl oz · us fluid ounce · fluid ounce	—	L3
us-cup	cup	cup · cups · us cup	—	L3
us-pint	pt	pt · pint · pints · us pint	—	L3
us-quart	qt	qt · quart · quarts · us quart	—	L3
us-gallon	gal	gal · gallon · gallons · us gallon	—	L3
uk-fluid-ounce	uk fl oz	uk fl oz · imperial fluid ounce · uk fluid ounce	—	L3
uk-pint	uk pt	uk pt · imperial pint · uk pint	—	L3
uk-quart	uk qt	uk qt · imperial quart · uk quart	—	L3
uk-gallon	uk gal	uk gal · uk_gal · imperial gallon · imperial gallons · uk gallon	—	L3
metric-cup	metric cup	metric cup · metric cups	—	L3
metric-tablespoon	metric tbsp	metric tbsp · metric tablespoon · metric tablespoons	—	L3
imperial-tablespoon	imp tbsp	imp tbsp · imperial tablespoon · imperial tablespoons · uk tablespoon	—	L3
dessertspoon	dessertspoon	dessertspoon · dessertspoons · dsp	—	L3
us-fluid-dram	US fl dr	US fl dr · us fluid dram · fluid dram	—	L3
us-oil-barrel	bbl	bbl · barrel · barrels · us oil barrel · oil barrel · petroleum barrel	—	L3
us-bushel	bushel	bushel · bushels · us bushel	—	L3
us-peck	peck	peck · pecks · us peck	—	L3
gram	g	g · gram · grams	p,n,µ,m,c,d,k,K	M
kilogram	kg	kg · kilogram · kilograms	—	M
tonne	t	t · tonne · tonnes · metric ton · ton	—	M
grain	grain	grain · grains · gr	—	M
carat	ct	ct · carat · carats · karat	—	M
ounce	oz	oz · ounce · ounces · avoirdupois ounce	—	M
pound	lb	lb · pound · pounds · pound avoirdupois	—	M
stone	st	st · stone · stones	—	M
short-ton	short ton	short ton · us ton · short tons · shortton	—	M
long-ton	long ton	long ton · uk ton · long tons · longton · british ton	—	M
dalton	Da	Da · dalton · daltons · amu · atomic mass unit · unified atomic mass unit	—	M
slug	slug	slug · slugs	—	M
quintal	quintal	quintal · quintals	—	M
us-hundredweight	cwt (US)	cwt (US) · us hundredweight · us cwt · short hundredweight	—	M
uk-hundredweight	cwt (UK)	cwt (UK) · uk hundredweight · uk cwt · long hundredweight · imperial hundredweight	—	M
troy-ounce	oz t	oz t · ozt · troy ounce · troy ounces	—	M
pennyweight	dwt	dwt · pennyweight · pennyweights	—	M
celsius	C°	C° · c · C · °c · celsius · c°	—	special
fahrenheit	F°	F° · f · F · °f · fahrenheit · f°	—	special
kelvin	K°	K° · k · K · °k · kelvin · k°	—	special
rankine	R°	R° · r · R · °r · rankine · r°	—	special
second	s	s · second · seconds · sec · secs	n,µ,m	T
millisecond	ms	ms · millisecond · milliseconds	—	T
minute	min	min · minute · minutes	—	T
hour	h	h · hour · hours · hr · hrs	—	T
day	day	day · days	—	T
week	week	week · weeks · wk	—	T
fortnight	fortnight	fortnight · fortnights · fn	—	T
julian-year	jyear	jyear · julian year · jy	—	T
gregorian-year	yr	yr · year · years · gregorian year · average year · average gregorian year	—	T
average-month	mo	mo · month · months · average month · average gregorian month	—	T
common-year	common year	common year · common year (365 days)	—	T
average-quarter	quarter (time)	quarter (time) · average quarter	—	T
m-per-s	m/s	m/s · meters per second	k,K,M	L·T-1
km-per-h	km/h	km/h · kph · kmh · kilometers per hour · kilometres per hour	—	L·T-1
mph	mph	mph · miles per hour · mi/h	—	L·T-1
ft-per-s	ft/s	ft/s · feet per second	—	L·T-1
knot	kn	kn · knot · knots	—	L·T-1
speed-of-light	c₀	c₀ · c0 · speed of light	—	L·T-1
mach	Mach	Mach · standard mach · mach number	—	L·T-1
m-per-s2	m/s²	m/s² · m/s2 · meters per second squared	k,K	L2·T-2
ft-per-s2	ft/s²	ft/s² · ft/s2 · feet per second squared	—	L2·T-2
standard-gravity	g₀	g₀ · standard gravity · g0 · gn · gravity · g-force · gforce	—	L2·T-2
km-per-h-s	km/h/s	km/h/s · kph/s · kilometers per hour per second	—	L2·T-2
radian	rad	rad · radian · radians	—	—
degree	deg	deg · degree · degrees · °	—	—
gradian	grad	grad · gradian · grads · gon	—	—
turn	turn	turn · turns · revolution · revolutions · rev · cycle · cycles	—	—
arcmin	arcmin	arcmin · arc minute · arcminutes · minute of arc · ′	—	—
arcsec	arcsec	arcsec · arc second · arcseconds · second of arc · ″	—	—
pascal	Pa	Pa · pascal · pascals	µ,m,c,k,K,M,G	L-1·M·T-2
hectopascal	hPa	hPa · hectopascal · hectopascals	—	L-1·M·T-2
bar	bar	bar · bars	m	L-1·M·T-2
atmosphere	atm	atm · atmosphere · atmospheres · standard atmosphere	—	L-1·M·T-2
torr	torr	torr · torrs · mmhg · mm hg	—	L-1·M·T-2
psi	psi	psi · lbf/in² · pounds per square inch · pound per square inch	—	L-1·M·T-2
ksi	ksi	ksi · kip per square inch	—	L-1·M·T-2
inhg	inHg	inHg · in hg · inches of mercury	—	L-1·M·T-2
techn-atm	at	at · technical atmosphere · techn atm	—	L-1·M·T-2
kgf-per-cm2	kgf/cm²	kgf/cm² · kgf/cm2 · kilogram force per square centimeter	—	L-1·M·T-2
mm-h2o	mmH2O	mmH2O · mm h2o · millimeter of water	—	L-1·M·T-2
cm-h2o	cmH2O	cmH2O · cm h2o · centimeter of water	—	L-1·M·T-2
psf	psf	psf · pound per square foot	—	L-1·M·T-2
newton	N	N · newton · newtons	µ,m,c,k,K,M,G	L·M·T-2
dyne	dyne	dyne · dynes	—	L·M·T-2
lbf	lbf	lbf · pound force · pound-force · lb force	—	L·M·T-2
kgf	kgf	kgf · kilogram force · kilogram-force · kp	—	L·M·T-2
ounce-force	ozf	ozf · ounce force · ounce-force	—	L·M·T-2
kip	kip	kip · kips · kilopound	—	L·M·T-2
poundal	poundal	poundal · poundals · pdl	—	L·M·T-2
us-ton-force	tonf (US)	tonf (US) · us ton force · us ton-force · short ton force	—	L·M·T-2
tonne-force	tonf (t)	tonf (t) · tonne force · tonne-force · tf · metric ton force	—	L·M·T-2
newton-meter	N·m	N·m · N m · N*m	—	L2·M·T-2
lbf-foot	lbf·ft	lbf·ft · lbf ft · lb-ft	—	L2·M·T-2
lbf-inch	lbf·in	lbf·in · lbf in · lb-in	—	L2·M·T-2
kgf-meter	kgf·m	kgf·m · kgf m · kgf*m	—	L2·M·T-2
newton-centimeter	N·cm	N·cm · N cm · N*cm · newton centimeter	—	L2·M·T-2
newton-millimeter	N·mm	N·mm · N mm · N*mm · newton millimeter	—	L2·M·T-2
ozf-inch	ozf·in	ozf·in · ozf in · oz-in · ounce force inch	—	L2·M·T-2
joule	J	J · joule · joules	m,µ,k,K,M,G,T	L2·M·T-2
watt-hour	Wh	Wh · watt hour · watt-hour · watt hours	—	L2·M·T-2
kilowatt-hour	kWh	kWh · kilowatt hour · kilowatt-hour	—	L2·M·T-2
megawatt-hour	MWh	MWh · megawatt hour	—	L2·M·T-2
gigawatt-hour	GWh	GWh · gigawatt hour	—	L2·M·T-2
calorie	cal	cal · calorie · calories	k,K	L2·M·T-2
kilocalorie	kcal	kcal · kilocalorie · kilocalories · Calorie · Calories · big calorie	—	L2·M·T-2
btu	BTU	BTU · btu · BTUs · british thermal unit	—	L2·M·T-2
therm	therm	therm · therms · us therm	—	L2·M·T-2
ft-lbf	ft·lbf	ft·lbf · ft lbf · foot pound force · foot-pound force · ftlbf	—	L2·M·T-2
electronvolt	eV	eV · electronvolt · electron volt	M,G,T	L2·M·T-2
erg	erg	erg · ergs	—	L2·M·T-2
ton-tnt	t TNT	t TNT · ton TNT · tonne TNT · ton of TNT	—	L2·M·T-2
quad	quad	quad · quads · quadrillion BTU	—	L2·M·T-2
horsepower-hour	hph	hph · horsepower hour · mechanical horsepower hour	—	L2·M·T-2
tonne-oil-equivalent	toe	toe · tonne of oil equivalent · ton oil equivalent	—	L2·M·T-2
watt	W	W · watt · watts	m,µ,k,K,M,G,T	L2·M·T-3
horsepower	hp	hp · horsepower · horse power · mechanical horsepower · imperial horsepower	—	L2·M·T-3
metric-horsepower	metric hp	metric hp · metric horsepower · cv · ps · pferd	—	L2·M·T-3
btu-per-h	BTU/h	BTU/h · btu/h · btuh · btu per hour	—	L2·M·T-3
electric-horsepower	hp (electric)	hp (electric) · electric horsepower · electric hp · US horsepower	—	L2·M·T-3
boiler-horsepower	hp (boiler)	hp (boiler) · boiler horsepower · boiler hp	—	L2·M·T-3
ton-refrigeration	TR	TR · ton refrigeration · ton of refrigeration	—	L2·M·T-3
hertz	Hz	Hz · hertz	k,K,M,G	T-1
rpm	rpm	rpm · r/min · revolutions per minute · rev per minute	—	T-1
bpm	bpm	bpm · beats per minute	—	T-1
bit	bit	bit · bits · b	k,K,M,G,T,P	—
byte	B	B · byte · bytes	k,K,M,G,T,P	—
kibibyte	KiB	KiB · kibibyte · kibibytes	—	—
mebibyte	MiB	MiB · mebibyte · mebibytes	—	—
gibibyte	GiB	GiB · gibibyte · gibibytes	—	—
tebibyte	TiB	TiB · tebibyte · tebibytes	—	—
pebibyte	PiB	PiB · pebibyte · pebibytes	—	—
kibibit	Kib	Kib · kibibit · kibibits	—	—
mebibit	Mib	Mib · mebibit · mebibits	—	—
gibibit	Gib	Gib · gibibit · gibibits	—	—
tebibit	Tib	Tib · tebibit · tebibits	—	—
pebibit	Pib	Pib · pebibit · pebibits	—	—
bit-per-s	bit/s	bit/s · bps · bits per second · b/s	k,K,M,G,T	T-1
byte-per-s	B/s	B/s · bytes per second · BPS	k,K,M,G,T	T-1
liter-per-s	L/s	L/s · liters per second · litres per second	m,k,K	L3·T-1
liter-per-min	L/min	L/min · liters per minute	—	L3·T-1
liter-per-h	L/h	L/h · liters per hour	—	L3·T-1
m3-per-s	m³/s	m³/s · m3/s · cubic meters per second	—	L3·T-1
m3-per-h	m³/h	m³/h · m3/h · cubic meters per hour	—	L3·T-1
gpm	gpm	gpm · us gpm · us gallons per minute	—	L3·T-1
cfs	cfs	cfs · cubic feet per second	—	L3·T-1
uk-gpm	UK gpm	UK gpm · uk gpm · imperial gpm · imperial gallons per minute	—	L3·T-1
cfm	cfm	cfm · cubic feet per minute · ft³/min	—	L3·T-1
us-mgd	US mgd	US mgd · us mgd · million gallons per day	—	L3·T-1
bbl-per-d	bbl/d	bbl/d · barrels per day · oil barrel per day	—	L3·T-1
l100km	L/100km	L/100km · l/100km · L per 100 km · l per 100km · liters per 100 km · litres per 100 km	—	special
lkm	L/km	L/km · l/km · L per km · l per km · liters per km · litres per km	—	special
kml	km/L	km/L · km/l · km per liter · km per litre · kmpl	—	special
mpg-us	US mpg	US mpg · mpg · us mpg · mpg (us) · us_mpg · mpg_us · usmpg	—	special
mpg-uk	UK mpg	UK mpg · uk mpg · mpg (uk) · uk_mpg · mpg_uk · ukmpg · imperial mpg · miles per imperial gallon	—	special
miles-per-liter	mi/L	mi/L · mi/l · miles per liter · miles per litre	—	special
us-gal100mi	US gal/100mi	US gal/100mi · us gal/100mi · us gallons per 100 miles	—	special
uk-gal100mi	UK gal/100mi	UK gal/100mi · uk gal/100mi · uk gallons per 100 miles	—	special
pascal-second	Pa·s	Pa·s · Pa s · Pa*s · pascal second	—	L-1·M·T-1
poise	P	P · poise · poises	—	L-1·M·T-1
centipoise	cP	cP · centipoise · centipoises	—	L-1·M·T-1
reyn	reyn	reyn · reyns	—	L-1·M·T-1
m2-per-s	m²/s	m²/s · m2/s · square meters per second	—	L2·T-1
stokes	St	St · stokes · stoke	—	L2·T-1
centistokes	cSt	cSt · centistokes	—	L2·T-1
ft2-per-s	ft²/s	ft²/s · ft2/s · square feet per second	—	L2·T-1
ampere	A	A · ampere · amperes · amp · amps	n,µ,m,k,K	A
volt	V	V · volt · volts	µ,m,k,K,M	L2·M·T-3·A-1
ohm	Ω	Ω · ohm · ohms	k,K,M,G	L2·M·T-3·A-2
coulomb	C	C · coulomb · coulombs	m,k,K	T·A
amp-hour	Ah	Ah · amp hour · ampere hour · amphour	—	T·A
millicoulomb	mC	mC · millicoulomb	—	T·A
kilocoulomb	kC	kC · kilocoulomb	—	T·A
mah	mAh	mAh · milliamp hour · milliampere hour	—	T·A
farad	F	F · farad · farads	—	L-2·M-1·T4·A2
picofarad	pF	pF · picofarad · picofarads	—	L-2·M-1·T4·A2
nanofarad	nF	nF · nanofarad · nanofarads	—	L-2·M-1·T4·A2
microfarad	µF	µF · microfarad · microfarads	—	L-2·M-1·T4·A2
millifarad	mF	mF · millifarad · millifarads	—	L-2·M-1·T4·A2
henry	H	H · henry · henries	m,µ	L2·M·T-2·A-2
siemens	S	S · siemens · siemen · mho	m,µ	L-2·M-1·T3·A2
weber	Wb	Wb · weber · webers	m	L2·M·T-2·A-1
tesla	T	T · tesla · teslas	m,µ	M·T-2·A-1
gauss	G	G · gauss	—	M·T-2·A-1
candela	cd	cd · candela · candelas	—	I
lumen	lm	lm · lumen · lumens	k,K,M	I
lux	lx	lx · lux	—	L-2·I
footcandle	fc	fc · foot-candle · foot candle · footcandle · footcandles	—	L-2·I
becquerel	Bq	Bq · becquerel · becquerels	m,k,K,M,G	T-1
curie	Ci	Ci · curie · curies	—	T-1
gray	Gy	Gy · gray · grays	m,µ,k,K,M	L2·M·T-2
rad-dose	rad (dose)	rad (dose) · rads · radiation absorbed dose · rad dose · absorbed rad	—	L2·M·T-2
sievert	Sv	Sv · sievert · sieverts	m,k,K,M	L2·M·T-2
rem	rem	rem · rems	—	L2·M·T-2

Related

• Units & quantities — expressions, conversions, phrase patterns and cooking densities.
• Custom units & constants — defining your own units on top of this catalog.