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SI Base Quantities and SI Base Units

This page provides an overview of the seven SI base quantities and their corresponding SI base units. These SI base quantities and units are independent of each other and form the foundation of the internationally used system of units.

The Seven SI Base Quantities and SI Base Units

Table 1: SI base quantities and SI base units
Base quantity Symbol SI base unit Unit symbol
Length \(l\) Meter m
Mass \(m\) Kilogram kg
Time \(t\) Second s
Electric current \(I\) Ampere A
Temperature \(T\) Kelvin K
Amount of substance \(n\) Mole mol
Luminous intensity \(I_v\) Candela cd