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The kilogram (kg) is the unit of mass (m). The name is derived from the Greek words kilo (κιλό), meaning "thousand", and gramma (γράμμα), known in the Late Antiquity as 1/24 part of a Roman uncia or about 1.14 gram.

The kilogram is defined in terms of second, meter and Planck's constant.


The kilogram was defined by the French Academy of Sciences in 1795 as the mass of 1 liter of water.

Related units
Last modified:10 March 2024 8.49 p.m.
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