Unit Conversions provide conversions for units, such as meter ⟹ foot, so that a source units can be converted into what is needed for localized Unit Preferences. There are many possible units, and additional units and conversions will be added in future releases.

• Each Source Unit is converted to the Target Unit by multiplying it by the Factor and adding the Offset (if any).
• The unit identifiers are internal, and are to be localized for display to users. See Hectare, for example.
• Each numeric value is an exact rational. (Radians are an exception since the value of π is irrational; a rational approximation is used.)The format is a terminating decimal where possible; otherwise a repeating decimal if possible (where ˙ marks the start of the reptend); otherwise a rational number (of the form numerator/denominator).
• The Systems column indicates which systems the units are used in. For now, they just show the two ‘inch-pound’ systems.
• The units are grouped and ordered by Quantity (which are based on the NIST quantities, see NIST 811). Note that the quantities are informative.
• The LDML specification should be consulted for more details, such as how to handle complex units (such as foot-per-minute) by converting the elements.

Warning: Do not scrape this chart for production data. Instead, for the meaning of the fields and data consult the LDML specification, and for machine-readable source data, access common/supplemental/units.xml, and for test data, access common/testData/units/unitsTest.txt.

Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
radioactivity	becquerel = per-second	si, metric, prefixable	becquerel	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
luminous-intensity	candela	si, metric, prefixable	candela	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
illuminance	lux = candela-per-square-meter	si, metric, prefixable	lux	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
luminous-flux	lumen = candela-square-meter-per-square-meter	si, metric, prefixable	lumen	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
mass	kilogram	si_acceptable, metric, prefixable	dalton	~1.6605×10ˆ-27	0.00000000000000000000000000166053878283
		si, metric, prefixable	gram	1/1000	0.001
		si, metric	kilogram	1	1
		si_acceptable, metric, prefixable	tonne	1,000	1000
		metric_adjacent, ussystem, uksystem	carat	1/5000	0.0002
		ussystem, uksystem	grain	~64.799×10ˆ-6	0.00006479891
			ounce	~0.02835	0.028349523125
			ounce-troy	~0.031103	0.03110348
			pound	~0.45359	0.45359237
		uksystem	stone	~6.3503	6.35029318
		ussystem, uksystem	slug	~14.594	5,560.277019075625/381
			ton	~907.18	907.18474
		jpsystem	fun	3/8000	0.000375
		astronomical	earth-mass	5.9722×10ˆ24	5972200000000000000000000
			solar-mass	~1.9885×10ˆ30	1988470000000000000000000000000
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
pressure	pascal = kilogram-per-meter-square-second	si, metric, prefixable	pascal	1	1
		si_acceptable, metric, prefixable	bar	100,000	100000
		metric_adjacent, ussystem, uksystem	gasoline-energy-density	~32.054×10ˆ9	722,250,000,000,000,000/22532213
		ussystem, uksystem	atmosphere	101,325	101325
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
pressure-per-length	kilogram-per-square-meter-square-second	metric_adjacent, ussystem, uksystem	ofhg	~133,320	133322.387415
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
magnetic-induction	tesla = kilogram-per-square-second-ampere	si, metric, prefixable	tesla	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
force	newton = kilogram-meter-per-square-second	si, metric, prefixable	newton	1	1
		metric_adjacent	kilogram-force	~9.8066	9.80665
		ussystem, uksystem	pound-force	~4.4482	4.4482216152605
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
energy	joule = kilogram-square-meter-per-square-second	si_acceptable, metric_adjacent	electronvolt	~160.22×10ˆ-21	0.0000000000000000001602177
		si, metric, prefixable	joule	1	1
		metric_adjacent, prefixable	calorie	4.184	4.184
			calorie-it	4.1868	4.1868
		ussystem, uksystem	british-thermal-unit	~1,054.4	1054.3502644˙8
			british-thermal-unit-it	~1,055.1	1055.05585262
			foodcalorie	4,184	4184
		ussystem	therm-us	~105.48×10ˆ6	105480400
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
magnetic-flux	weber = kilogram-square-meter-per-square-second-ampere	si, metric, prefixable	weber	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
electric-inductance	henry = kilogram-square-meter-per-square-second-square-ampere	si, metric, prefixable	henry	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
power	watt = kilogram-square-meter-per-cubic-second	si, metric, prefixable	watt	1	1
		ussystem, uksystem	horsepower	~745.7	745.69987158227022
		astronomical	solar-luminosity	382.8×10ˆ24	382800000000000000000000000
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
voltage	volt = kilogram-square-meter-per-cubic-second-ampere	si, metric, prefixable	volt	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
electric-resistance	ohm = kilogram-square-meter-per-cubic-second-square-ampere	si, metric, prefixable	ohm	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
length	meter	si, metric, prefixable	meter	1	1
		si_acceptable, ussystem, uksystem	nautical-mile	1,852	1852
		si, metric	100-kilometer	100,000	100000
		si_acceptable, astronomical	astronomical-unit	~149.6×10ˆ9	149597870700
		metric_adjacent, ussystem, uksystem	point	~352.78×10ˆ-6	0.000352˙7
		metric_adjacent	mile-scandinavian	10,000	10000
		ussystem, uksystem	inch	0.0254	0.0254
			foot	0.3048	0.3048
			yard	0.9144	0.9144
			fathom	1.8288	1.8288
			rod	5.0292	5.0292
			chain	~20.117	20.1168
			furlong	~201.17	201.168
			mile	~1,609.3	1609.344
		jpsystem	rin	~33.058×10ˆ-6	0.000˙0330578512396694214876
			sun	2/605	0.0˙0330578512396694214876
			shaku-length	4/121	0.˙0330578512396694214876
			shaku-cloth	5/121	0.˙0413223140495867768595
			ken	~0.19835	0.˙1983471074380165289256
			jo-jp	~0.33058	0.˙3305785123966942148760
			ri-jp	~428.43	428.˙4297520661157024793388
		astronomical	earth-radius	6,378,100	6378100
			solar-radius	695.7×10ˆ6	695700000
			light-year	~9.4607×10ˆ15	9460730472580800
		astronomical, prefixable	parsec	~30.857×10ˆ15	12,699,352,539,696,155,673,600,000/411557987
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
speed	meter-per-second	si_acceptable, ussystem, uksystem	knot	~0.51444	0.51˙4
		metric_adjacent	beaufort	0	0
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
acceleration	meter-per-square-second	metric_adjacent, ussystem, uksystem	g-force	~9.8066	9.80665
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
area	square-meter	si_acceptable, metric	hectare	10,000	10000
		metric_adjacent	dunam	1,000	1000
		ussystem, uksystem	acre	~4,046.9	4046.8564224
		jpsystem	bu-jp	~3.3058	3.˙3057851239669421487603
			se-jp	~99.174	99.˙1735537190082644628099
			cho	~9,917.4	9917.˙3553719008264462809917
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
ionizing-radiation	gray = square-meter-per-square-second	si, metric, prefixable	gray	1	1
			sievert
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
volume	cubic-meter	si_acceptable, metric, prefixable	liter	1/1000	0.001
		metric_adjacent	cup-metric	1/4000	0.00025
			pint-metric	1/2000	0.0005
		ussystem	drop	~51.343×10ˆ-9	0.0000000513429332682291˙6
			pinch	~231.04×10ˆ-9	0.00000023104319970703125
			dessert-spoon	~1.8483×10ˆ-6	0.00000184834559765625
		uksystem	dessert-spoon-imperial	~2.2198×10ˆ-6	0.0000022197705078125
		ussystem	dram	~3.6967×10ˆ-6	0.0000036966911953125
			teaspoon	~4.9289×10ˆ-6	0.00000492892159375
			tablespoon	~14.787×10ˆ-6	0.00001478676478125
		uksystem	fluid-ounce-imperial	~28.413×10ˆ-6	0.0000284130625
		ussystem	fluid-ounce	~29.574×10ˆ-6	0.0000295735295625
			jigger	~44.36×10ˆ-6	0.00004436029434375
			cup	~236.59×10ˆ-6	0.0002365882365
			pint	~473.18×10ˆ-6	0.000473176473
		uksystem	pint-imperial	~568.26×10ˆ-6	0.00056826125
		ussystem	quart	~946.35×10ˆ-6	0.000946352946
		uksystem	quart-imperial	~0.0011365	0.0011365225
		ussystem	gallon	~0.0037854	0.003785411784
		uksystem	gallon-imperial	~0.0045461	0.00454609
		ussystem	bushel	~0.035239	0.03523907016688
			barrel	~0.15899	0.158987294928
		jpsystem	sai	~1.8039×10ˆ-6	0.002401/1331
			kosaji	5×10ˆ-6	0.000005
			osaji	15×10ˆ-6	0.000015
			shaku	~18.039×10ˆ-6	0.02401/1331
			cup-jp	1/10000	0.0001
			to-jp	~0.018039	24.01/1331
			koku	~0.18039	240.1/1331
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
duration	second	si, metric, ussystem, uksystem, astronomical, prefixable	second	1	1
		si_acceptable, metric_adjacent, ussystem, uksystem, astronomical, prefixable	minute	60	60
			hour	3,600	3600
			day	86,400	86400
		metric_adjacent, ussystem, uksystem, astronomical	week	604,800	604800
		ussystem, uksystem	fortnight	1,209,600	1209600
		person_age	day-person	86,400	86400
			week-person	604,800	604800
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
electric-charge	coulomb = second-ampere	si, metric, prefixable	coulomb	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
electric-conductance	siemens = cubic-second-square-ampere-per-kilogram-square-meter	si, metric, prefixable	siemens	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
electric-capacitance	farad = pow4-second-square-ampere-per-kilogram-square-meter	si, metric, prefixable	farad	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
year-duration	year	metric_adjacent, ussystem, uksystem, astronomical	month	1/12	0.08˙3
		metric_adjacent	quarter	1/4	0.25
		metric_adjacent, ussystem, uksystem, astronomical, prefixable	year	1	1
		metric_adjacent, ussystem, uksystem, astronomical	decade	10	10
			century	100	100
		person_age	month-person	1/12	0.08˙3
			year-person	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
electric-current	ampere	si, metric, prefixable	ampere	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
temperature	kelvin	si, metric	celsius	1	1	273.15
		si, metric, prefixable	kelvin
		ussystem, uksystem	fahrenheit	5/9	0.˙5	255.37˙2
			rankine
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
angle	revolution	si_acceptable, metric_adjacent, ussystem, uksystem, astronomical	arc-second	~771.6×10ˆ-9	0.0000007˙716049382
			arc-minute	~46.296×10ˆ-6	0.00004˙629
			degree	1/360	0.002˙7
		si, metric	radian	~0.15915	65,501,488/411557987
		metric_adjacent, ussystem, uksystem	revolution	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
frequency	hertz = revolution-per-second	si, metric, prefixable	hertz	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
solid-angle	square-revolution	si, metric	steradian	~0.02533	4,290,444,930,214,144/169379976663492169
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
substance-amount	item	si, metric, prefixable	mole	~602.21×10ˆ21	602214076000000000000000
		metric_adjacent, ussystem, uksystem	item	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
concentration-mass	item-per-kilogram	metric_adjacent	ofglucose	~3.3427×10ˆ24	6,022,140,760,000,000,000,000,000,000,000/1801557
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
catalytic-activity	item-per-second	si, metric	katal	~602.21×10ˆ21	602214076000000000000000
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
portion	portion	metric_adjacent, ussystem, uksystem	permillion	1×10ˆ-6	0.000001
			permyriad	1/10000	0.0001
			permille	1/1000	0.001
			percent	1/100	0.01
			karat	1/24	0.041˙6
			portion	1	1
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
digital	bit	metric_adjacent, ussystem, uksystem, prefixable	bit	1	1
			byte	8	8
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
graphics	dot = pixel	metric_adjacent, ussystem, uksystem	dot	1	1
		metric_adjacent, ussystem, uksystem, prefixable	pixel
Quantity	Target	Systems	Source Unit	Approx. Factor	Exact* Factor	Offset
typewidth	em	metric_adjacent, ussystem, uksystem	em	1	1