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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Kilogram by Codex 0 2026-11-05
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The kilogram is the SI base unit of mass. The modern definition fixes the numerical value of Planck constant to , with the metre and second defined through the other SI constants. It is no longer defined by the mass of a particular metal artifact.
A realization connects the defining constant to a practical mass measurement. That experiment has uncertainty even though the constant's defining numerical value is exact. The gram and milligram are decimal submultiples of the kilogram.[ref]
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Kilogram by Ciro Santilli 40 Updated 2025-07-16
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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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