What Is the SI Unit for Mass?


Quick Answer

Kilogram is the SI base unit for mass. It is equal to the mass of the international prototype of the kilogram, a platinum-iridium standard kept at the International Bureau of Weights and Measures. The symbol for kilogram is kg. SI units derived from it include grams, centigrams and milligrams.

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Full Answer

According to The National Institute of Standards and Technology (NIST), each country that subscribed to the International Metric Convention was assigned a copy of the international standards; these are known as National Prototypes. In the United States, the national prototype for the kilogram is a platinum-iridium cylinder kept at the NIST.

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