National Physical Laboratory

What is a base unit? (FAQ - Quantum)

SI units are divided into two classes, base units and derived units. The base units are dimensionally independent and the derived units are formed by combinations of powers of the base units. The base units of the SI are the metre, kilogram, second, ampere, kelvin, candela and the mole.

For more information and lists of derived units see the Units pages.

Last Updated: 1 Dec 2010
Created: 1 Dec 2010