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A kilogram (kg) is a unit of mass in the International System of Units (SI). It is defined as being equal to the mass of the International Prototype of the Kilogram, a platinum-iridium cylinder that was kept at the International Bureau of Weights and Measures (BIPM) in France.

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  1. Units of mass
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Kilogram by Ciro Santilli 37 Updated 2025-06-17 +Created 1970-01-01
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Unit of mass.
Defined in the 2019 redefinition of the SI base units via the Planck constant. This was possible due to the development of the Kibble balance.
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