SI REFERENCE POINT
Version: 1.0 Beta, last update: 2024-02-14

kilogram

The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.

This definition is valid from 1901-05-20 to 2019-05-19
Unit kilogram
Symbol kg
Quantity mass
Unit Type SI base unit
Notes:
  1. This international prototype, made of platinum-iridium, is kept at the BIPM under conditions specified by the 1st CGPM in 1889.