Unit Preferences provide a way to get the units that are appropriate for a region, and usage, and threshold amounts. The Unit Conversions are used to handle conversion of units needed to use the preferences.This release adds additional structure for usage and threshold amount, allowing for more additions of regions, usages, thresholds, and units in future releases.

• The Base Unit shows the unit whose amount is to be compared to the ‘If ≥’ amount of the Result Unit.
• The unit identifiers are internal, and would be localized for display to users. See Hectare, for example.
• The Usage shows the type of usage; default is used as a fallback no more specific match is found.
• The Sample region represents a set of regions if it has a superscript. See the table at the bottom. 001 (World) is the default if no more specific region is found.
• The ‘If ≥’ column shows the thresholds: the first line for a given region where the input amount is greater or equal applies. For example, for 0.5km as input for [area, default, 001] would result in hectare.
• 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 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, and how to fall back if a given usage or region is not found.

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/unitPreferencesTest.txt.

Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
square-meter	default	001	1	square-kilometer		area
				hectare
				square-meter
				square-centimeter
		GB, …1		square-mile
				acre
				square-foot
				square-inch
	floor	001		square-meter
		CA, …1		square-foot
	geograph	001		square-kilometer
		GB, …1		square-mile
	land	001		hectare
		GB, …1		acre
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
item-per-cubic-meter	blood-glucose	AG, …1	1	millimole-per-liter		concentration
		001		milligram-ofglucose-per-deciliter
	default			item-per-cubic-meter
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
cubic-meter-per-meter	default	001	1	liter-per-100-kilometer		consumption
	vehicle-fuel
		BR, …1		liter-per-kilometer
		US		mile-per-gallon
		CA, …2		mile-per-gallon-imperial
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
second	default	001	1	day		duration
				hour
				minute
				second
				millisecond
				microsecond
				nanosecond
	media			minute & second
				second
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
kilogram-square-meter-per-square-second	default	001	1	kilowatt-hour		energy
	food	US		foodcalorie
		001		kilocalorie
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
meter	default	001	1	kilometer		length
				meter
				centimeter
		GB, …1		mile
				foot
				inch
	focal-length	001		millimeter
	person			centimeter
		CA, …3		inch
	person-height	001		centimeter
		CA, …3	3	foot & inch
			1	inch
		AT, …1		meter & centimeter
	rainfall	BR		centimeter
		US		inch
		001		millimeter
	road		0.9	kilometer
			300	meter	precision-increment/50
			10		precision-increment/10
			1		precision-increment/1
		US	0.5	mile
			100	foot	precision-increment/50
			10		precision-increment/10
			1		precision-increment/1
		GB	0.5	mile
			100	yard	precision-increment/50
			10		precision-increment/10
			1		precision-increment/1
		SE		mile-scandinavian
				kilometer
			300	meter	precision-increment/50
			10		precision-increment/10
			1		precision-increment/1
	snowfall	001		centimeter
		US		inch
	vehicle	GB, …1		foot & inch
		001		meter
	visiblty		0.1	kilometer
			1	meter
		DE, …1
		GB, …1		mile
				foot
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
kilogram	default	001	1	tonne		mass
				kilogram
				gram
				milligram
				microgram
		GB, …1		ton
				pound
				ounce
	person	001		kilogram
				gram
		US		pound
				pound & ounce
		GB		stone & pound
				pound & ounce
		HK
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
kilogram-per-cubic-meter	default	001	1	kilogram-per-cubic-meter		mass-density
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
kilogram-square-meter-per-cubic-second	default	001	1	gigawatt		power
				megawatt
				kilowatt
				watt
				milliwatt
	engine			kilowatt
		GB, …1		horsepower
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
kilogram-per-meter-square-second	baromtrc	001	1	hectopascal		pressure
		US		inch-ofhg
		BR, …2		millibar
		MX, …1		millimeter-ofhg
	default	001		megapascal
				pascal
		GB, …1		pound-force-per-square-inch
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
meter-per-second	default	001	1	kilometer-per-hour		speed
		GB, …1		mile-per-hour
	rainfall	001		millimeter-per-hour
		BR		centimeter-per-hour
		US		inch-per-hour
	snowfall	001		centimeter-per-hour
		US		inch-per-hour
	wind	001		kilometer-per-hour
		CN, …1		meter-per-second
		GB, …1		mile-per-hour
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
kelvin	default	001	1	celsius		temperature
		US		fahrenheit
	weather	001		celsius
		BS, …1		fahrenheit
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
cubic-meter	default	001	1	cubic-meter		volume
				cubic-centimeter
		GB, …1		cubic-foot
				cubic-inch
	fluid	001		liter
				milliliter
		US		gallon
				quart
				pint
				cup
				fluid-ounce
				tablespoon
				teaspoon
		GB		gallon-imperial
				fluid-ounce-imperial
	oil	001		barrel
	vehicle	US		gallon
		001		liter
Base Unit	Usage	Sample Region	If ≥	Result Unit	Skeleton	Quantity
year	default	001	1	year		year-duration
				month
	person-age		2.5	year-person
			1	year-person & month-person
				month-person

Region Sets

Sample Region	Region Set
AG, …1	AG, AI, AO, AU, BA, BG, BH, BM, BN, BW, BY, CA, CH, CM, CN, CZ, DK, DM, EE, FI, FJ, GB, GD, HK, HR, HU, IE, IM, IS, KE, KN, KW, KZ, LC, LI, LT, LU, LV, ME, MG, MK, MO, MS, MT, MU, MY, MZ, NA, NL, NO, NZ, OM, PG, RS, RU, SE, SG, SI, SK, TC, TO, UA, UG, VC, VG, VN, VU, ZA
AT, …1	AT, BE, DZ, EG, ES, FR, HK, ID, IL, IT, JO, MY, SA, SE, TR, VN
BR, …1	BR, IT, JP, KR, MX, MY, NL, TH, TR
BR, …2	BR, EG, GB, IL, TH
BS, …1	BS, BZ, KY, PR, PW, US
CA, …1	CA, GB, MM, US
CA, …2	CA, GB
CA, …3	CA, GB, IN, US
CN, …1	CN, DK, FI, JP, KR, NO, PL, RU, SE
DE, …1	DE, NL
GB, …1	GB, US
MX, …1	MX, RU