Any unit of length gives a corresponding unit of volume: the volume of a cube whose sides have the given length. For example, a cubic centimetre (cm3) is the volume of a cube whose sides are one centimetre (1 cm) in length.
In the International System of Units (SI), the standard unit of volume is the cubic metre (m3). The metric system also includes the litre (L) as a unit of volume, where one litre is the volume of a 10-centimetre cube. Thus
- 1 litre = (10 cm)3 = 1000 cubic centimetres = 0.001 cubic metres,
- 1 cubic metre = 1000 litres.
Small amounts of liquid are often measured in millilitres, where
- 1 millilitre = 0.001 litres = 1 cubic centimetre.
In the same way, large amounts can be measured in megalitres, where
- 1 million litres = 1000 cubic metres = 1 megalitre.
Various other traditional units of volume are also in use, including the cubic inch, the , the cubic yard, the cubic mile, the teaspoon, the tablespoon, the fluid ounce, the fluid dram, the gill, the pint, the quart, the gallon, the minim, the barrel, the cord, the peck, the bushel, the hogshead, the and the .