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Linking units

This page introduces some of the units of measure that you can use to describe your data. It assumes that you have a rough understanding of what linked data is and where you might want to make use of it.

If you already know which unit you want to reuse but want to find out how to use it, see the guide on reusing units.


QUDT's Units Vocabulary is the preferred system of units recommended for use with csvcubed.

Below we list a summary of some of the key units you may wish to use. Note that the units listed in this document are not exhaustive; if the unit that you want to represent has not been listed below then please refer to QUDT's Units Vocabulary to see if a suitable unit has already been published. If not, you may wish to define a new unit.


e.g. average household income in a given region.

Unit Identifier Quantity Kind
Pound Sterling Currency
Euro Currency
US Dollar Currency


e.g. distance from population centres to the nearest train station.

Unit Identifier Quantity Kind
Metre Length
Yard Length
Mile Length


e.g. Area of green space in a given locality.

Unit Identifier Quantity Kind
Square inch Area
Square metre Area
Acre Area
Hectare Area


e.g. volume of potholes on roads in a given area.

Unit Identifier Quantity Kind
Litre Volume
Cubic metre Volume
Pint (UK) Volume
Teaspoon Volume
Tablespoon Volume
Barrels (UK Petroleum) Volume

Time Periods

e.g. how long it takes an athlete to complete a 100m sprint.

Unit Identifier Quantity Kind
Seconds Time
Minutes Time
Hours Time
Days Time
Years Time

Counts & rates

e.g. the number of people observed sleeping rough in town centres on a given night.

Unit Identifier Quantity Kind
Number (count) Dimensionless
Per day Frequency
Number per hour Frequency
Hz Frequency


e.g. electrical energy consumption of households on a given day.

Unit Identifier Quantity Kind
kWh Energy
Kilocalorie Energy


e.g. daily observed maximum/minimum air temperatures.

Unit Identifier Quantity Kind
Degrees Celcius Temperature
Degrees Kelvin Temperature


e.g. weights of new-born babies.

Unit Identifier Quantity Kind
Kilogramme Mass
Metric Tonne Mass
Imperial Ton (UK) Mass
Stone Mass

Ranks and ordinals

e.g. the ranks/final positions of participants in a competition.

Occasionally you may want to record the ranks or ordinals. Ranks do not have a unit and so you should express this with the UNITLESS unit.

Unit Identifier Quantity Kind
Unitless Dimensionless