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QuantityUnit[quantity]

returns the unit associated with the specified quantity.

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QuantityUnit

QuantityUnit[quantity]

returns the unit associated with the specified quantity.

Details

Examples

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Basic Examples  (1)

Give the unit part of a Quantity:

Wolfram Language code: QuantityUnit[Quantity[3.4, "Meters"]]
Wolfram Language code: QuantityUnit[[image]]
Wolfram Language code: QuantityUnit[Quantity[19.25, "Acres"]]

Scope  (4)

Get the units from Quantity expressions in a time series:

Wolfram Language code: data = MoonPosition[DateRange[DateObject[{2013, 1, 1}, "Day", "Gregorian", -6.], DateObject[{2013, 12, 31}, "Day", "Gregorian", -6.], 10]]
Wolfram Language code: data[{2013, 1, 20}]
Wolfram Language code: QuantityUnit[data]
Wolfram Language code: %[{2013, 1, 20}]

QuantityUnit returns the unit specification of a QuantityDistribution:

Wolfram Language code: 𝒟 = TriangularDistribution[{Quantity[55, "Miles"/"Hours"], Quantity[82, "Miles"/"Hours"]}, Quantity[72, "Miles"/"Hours"]]
Wolfram Language code: QuantityUnit[𝒟]

QuantityUnit accepts structured arrays like QuantityArray and SymmetrizedArray objects:

Wolfram Language code: QuantityUnit[QuantityArray[{1, 2, 3}, "Hectares"]]
Wolfram Language code: QuantityUnit[SymmetrizedArray[{{1, 1} -> Quantity[2, "Liters"], {2, 1} -> Quantity[3, "Newtons"], {2, 2} -> Quantity[4, "Joules"]}, {2, 2}, Symmetric[{1, 2}]]]

QuantityUnit accepts SparseArray and Association objects:

Wolfram Language code: QuantityUnit[SparseArray[{1 -> Quantity[8, "Bits"], 2 -> Quantity[1, "Octets"]}]]
Wolfram Language code: QuantityUnit[<|"Distance" -> Quantity[260, "Miles"], "Duration" -> Quantity[3, "Hours"]|>]

Properties & Relations  (4)

QuantityUnit operates on lists of quantities:

Wolfram Language code: QuantityUnit[{Quantity[3.4, "Parsecs"], Quantity[36, "Pounds"]}]
Wolfram Language code: QuantityUnit[{{Quantity[52, "Weeks"], Quantity[20, "Candelas"]}, Quantity[2, "Microns"]}]

QuantityUnit returns "DimensionlessUnit" for NumericQ arguments:

Wolfram Language code: QuantityUnit[1.5]
Wolfram Language code: QuantityUnit[Sqrt[2]]

QuantityUnit returns the MixedUnit specification of a mixed Quantity:

Wolfram Language code: Quantity[MixedMagnitude[{1, 80}], MixedUnit[{"Meters", "Centimeters"}]]
Wolfram Language code: QuantityUnit[%]
Wolfram Language code: QuantityUnit[Quantity[MixedMagnitude[{5, 10}], MixedUnit[{"Feet", "Inches"}]]]

QuantityUnit always returns a unit string in its canonical form:

Wolfram Language code: Quantity[1, "Days"]
Wolfram Language code: QuantityUnit[%]
Wolfram Research (2012), QuantityUnit, Wolfram Language function, https://reference.wolfram.com/language/ref/QuantityUnit.html.

Text

Wolfram Research (2012), QuantityUnit, Wolfram Language function, https://reference.wolfram.com/language/ref/QuantityUnit.html.

CMS

Wolfram Language. 2012. "QuantityUnit." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/QuantityUnit.html.

APA

Wolfram Language. (2012). QuantityUnit. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/QuantityUnit.html

BibTeX

@misc{reference.wolfram_2026_quantityunit, author="Wolfram Research", title="{QuantityUnit}", year="2012", howpublished="\url{https://reference.wolfram.com/language/ref/QuantityUnit.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_quantityunit, organization={Wolfram Research}, title={QuantityUnit}, year={2012}, url={https://reference.wolfram.com/language/ref/QuantityUnit.html}, note=[Accessed: 12-June-2026]}