Wikidata:Units

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This is a page for giving whatever information is available about storing units in Wikidata. Beyond units, Wikidata needs to express similar concepts like numeric datatype, scientific notation, and descriptions of uncertainty in data.

Units list[edit]

Each unit (unit of measurement (Q47574)) is related to physical properties (physical quantity (Q107715)).

The SI units (SI base unit (Q223662)) are green colored.

Spatial dimensions[edit]

Length (length (Q36253))[edit]

Unit With prefixes Corresponding properties
metre (Q11573) yottametre (Q10543042) radius (P2120), vehicle range (P2073), wingspan (P2050), height (P2048), width (P2049), length (P2043), elevation above sea level (P2044), distance from river mouth (P2148), focal length (P2151)
zettametre (Q3277915)
exametre (Q3277907)
petametre (Q3277919)
terametre (Q3267417)
gigametre (Q854546)
megametre (Q1054140)
myriametre (Q1970718)
kilometre (Q828224)
hectometre (Q844338)
decametre (Q848856)
decimetre (Q200323)
centimetre (Q174728)
millimetre (Q174789)
micrometre (Q175821)
nanometre (Q178674)
picometre (Q192274)
femtometre (Q208788)
attometre (Q6003257)
zeptometre (Q3270676)
yoctometre (Q3221356)
parsec (Q12129) gigaparsec (Q14916719)
megaparsec (Q3773454)
kiloparsec (Q11929860)
attoparsec (Q15784325)
light-year (Q531)
light-second (Q909315)
astronomical unit (Q1811)
mile (Q253276)
foot (Q3710)
inch (Q218593)
thou (Q1165799)

Area (area (Q11500))[edit]

Unit With prefixes Corresponding properties
square metre (Q25343) square kilometre (Q712226) area (P2046), watershed area (P2053), wing area (P2112)
square centimetre (Q2489298)
square millimetre (Q2737347)
are (Q185078) hectare (Q35852)

Volume (volume (Q39297))[edit]

Unit With prefixes Corresponding properties
cubic metre (Q25517) cubic kilometre (Q4243638) volume as quantity (P2234)
cubic decimetre (Q2175964)
cubic centimetre (Q1022113)
cubic millimetre (Q3675550)
liter (Q11582) hectoliter (Q2029519)
decaliter (Q2637946)
centiliter (Q1815100)
milliliter (Q2332346)
microliter (Q2282891)
picoliter (Q3902688)
femtoliter (Q3312063)

Time (time (Q11471)) and frequency (frequency (Q11652))[edit]

Quantities with unit of time represent a duration or time interval. To use a value representing a point in time (e.g. a date), use of time value is recommended.

Time interval (time interval (Q186081))[edit]

Unit With prefixes Corresponding properties
second (Q11574) millisecond (Q723733) duration (P2047), half-life (P2114)
microsecond (Q842015)
nanosecond (Q838801)
femtosecond (Q1777507)
attosecond (Q2483628)
picosecond (Q3902709)
day (Q573)
week (Q23387)
hour (Q25235)
minute (Q7727)
month (Q5151)
annum (Q1092296)
year (Q577) term length of office (P2097)
24-hour clock time (Q216589) Wikidata:Property_proposal/Pending/2#checkin_time_.28en.29

Frequency (frequency (Q11652))[edit]

Unit With prefixes Corresponding properties
hertz (Q39369) kilohertz (Q2143992) frequency (P2144)
megahertz (Q732707)
gigahertz (Q3276763)

Matter[edit]

Mass (mass (Q11423))[edit]

Unit With prefixes Corresponding properties
kilogram (Q11570) yottagram (Q613726) mass (P2067)
zettagram (Q14754979)
exagram (Q2655272)
petagram (Q2612219)
teragram (Q1770733)
gigagram (Q2799294)
megagram (Q11776930)
myriagram (Q2151240)
hectogram (Q1057069)
decagram (Q6517513)
gram (Q41803)
decigram (Q1772386)
centigram (Q2691798)
milligram (Q3241121)
microgram (Q1645498)
nanogram (Q2282906)
picogram (Q3239557)
femtogram (Q1913097)
attogram (Q2438073)
zeptogram (Q6171168)
yoctogram (Q6170164)
pound (Q100995)
atomic mass unit (Q483261)

Density (density (Q29539))[edit]

Unit With prefixes Corresponding properties
kilogram per cubic metre (Q844211) gram per cubic centimetre (Q13147228) density (P2054)

Concentration (concentration (Q3686031))[edit]

Unit Corresponding properties
gram per liter (Q834105) solubility (P2177), lower flammable limit (P2202), upper flammable limit (P2203), median lethal dose (P2240), minimal lethal dose (P2300) and time-weighted average exposure limit (P2404), ceiling exposure limit (P2405), maximum peak exposure limit (P2406) and short-term exposure limit (P2407)
Gram per cubic meter
millilitre per litre (Q21075844)
milligram per cubic meter (Q21077820)
mol per kilogram of solvent (Q21064838)
mol per litre of solution (Q21064845)
mass fraction (Q899138)
mole fraction (Q125264)
volume fraction (Q909482)
parts per million (Q21006887)
part per billion (Q2055118)
milligram per kilogram (Q21091747)
gram per kilogram (Q21061369)

Thermodynamics[edit]

Temperature (temperature (Q11466))[edit]

Unit Corresponding properties
degree Celsius (Q25267) temperature (P2076), melting point (P2101), boiling point (P2102), decomposition point (P2107), sublimation temperature (P2113), flash point (P2128)
kelvin (Q11579)
degree Fahrenheit (Q42289)
Rankine scale (Q207488)

Pressure (pressure (Q39552))[edit]

Unit With prefixes Corresponding properties
atmosphere (Q177974) pressure (P2077), vapor pressure (P2119)
technical atmosphere (Q909066)
bar (Q103510)
pascal (Q44395) megapascal (Q21062777)
kilopascal (Q21064807)
hectopascal (Q5139563)
torr (Q185648)
millimeter of mercury (Q6859652)
metre of water (Q2042279) centimetre of water (Q1247300)
millimetre of water (Q13479685)

Thermal capacity (heat capacity (Q179388))[edit]

Unit With prefixes Corresponding properties
joule per mole-kelvin (Q20966455) heat capacity (P2056)

Thermal conductivity (thermal conductivity (Q487005))[edit]

Unit With prefixes Corresponding properties
watt per meter kelvin (Q1463969) thermal conductivity (P2068)

Mechanics[edit]

Speed (speed (Q3711325))[edit]

Unit With prefixes Corresponding properties
kilometre per hour (Q180154) speed (P2052), speed of sound (P2075)
metre per second (Q182429) Q4220561
knot (Q128822)

Kinematic viscosity (kinematic viscosity (Q15106259))[edit]

Unit With prefixes Corresponding properties
stokes (Q1569733) kinematic viscosity (P2118)
m2/s

Electromagnetism, optics[edit]

Electrical conductivity (electrical conductivity (Q4593291))[edit]

Unit With prefixes Corresponding properties
amperes per volt meter (Q20966435) electrical conductivity (P2055)

Luminosity (luminosity (Q105902))[edit]

Unit With prefixes Corresponding properties
solar luminosity (Q843877) luminosity (P2060)

Chemistry[edit]

Enthalpy (enthalpy (Q161064))[edit]

Unit With prefixes Corresponding properties
joule per mole (Q13035094) kilojoule per mole (Q752197) fusion enthalpy (P2066), enthalpy of vaporization (P2116), combustion enthalpy (P2117)
kilojoule per kilogram (Q21077849)

Currency (currency (Q8142))[edit]

Unit With prefixes Corresponding properties
euro (Q4916) award received (P166), prize money (P2121), cost (P2130), nominal GDP (P2131), nominal GDP per capita (P2132), total debt (P2133), total reserves (P2134), total exports (P2135), total imports (P2136), total equity (P2137), total liabilities (P2138), total revenue (P2139), foreign direct investment net outflow (P2140), foreign direct investment net inflow (P2141), box office (P2142), household wealth (P2220)
crore (Q1137675)

Dimensionless[edit]

Item Corresponding properties
infection (Q166231) number of cases (P1603)

Reports[edit]

Discussion list[edit]

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