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The **cubic metre** (in British English and international spelling as used by the International Bureau of Weights and Measures) or **cubic meter** (in American English) is the SI derived unit of volume.^{[1]} Its SI symbol is **m ^{3}**.

Main article: Unit conversion

1 cubic metre = 1000 litres (exactly) ^{[2]}^{[3]}≈ 35.3 cubic feet ≈ 1.31 cubic yards ≈ 6.29 oil barrels ≈ 220 imperial gallons ≈ 264 US fluid gallons

A cubic metre of pure water at the temperature of maximum density (3.98 °C or 39.16 °F) and standard atmospheric pressure (101.325 kPa) has a mass of 1000 kg, or one tonne. At 0 °C, the freezing point of water, a cubic metre of water has slightly less mass, 999.972 kilograms.

It is sometimes abbreviated to ** cu m**,

Abbreviated **CBM** and **cbm** in the freight business and **MTQ** (or numeric code 49) in international trade.

Main article: SI prefix

See 1 E-3 m³ for a comparison with other volumes.

- Cubic decametre
- the volume of a cube of side length one decametre (10 m)
- equal to a megalitre
- 1 dam
^{3}= 1000 m^{3}= 1 ML

- Cubic hectometre
- the volume of a cube of side length one hectometre (100 m)
- equal to a gigalitre
- 1 hm
^{3}= 1000000 m^{3}= 1 GL

- Cubic kilometre
- the volume of a cube of side length one kilometre (1000 m)
- equal to a teralitre
- 1 km
^{3}= 1000000000 m^{3}= 1 TL

- Cubic decimetre
- the volume of a cube of side length one decimetre (0.1 m)
- equal to a litre
- 1 dm
^{3}= 0.001 m^{3}= 1 L

- Cubic centimetre
^{[4]} - the volume of a cube of side length one centimetre (0.01 m)
- equal to a millilitre
- 1 cm
^{3}= 0.000001 m^{3}= 10^{−6}m^{3}= 1 mL

- Cubic millimetre
- the volume of a cube of side length one millimetre (0.001 m)
- equal to a microlitre
- 1 mm
^{3}= 0.000000001 m^{3}= 10^{−9}m^{3}= 1 µL

- ^
^{a}^{b}Bureau International de Poids et Mesures. "Derived units expressed in terms of base units". 2014. Accessed 7 Aug 2014. **^**From 1901 to 1964 the litre was defined as the volume of one kilogram of pure water at 4°C and 760 millimetres of mercury pressure. During this time, a litre was about 1.000028 dm^{3}. In 1964 the original definition was reverted to.**^**http://www.bipm.org/en/si/si_brochure/chapter4/table6.html**^**The cubic centimetre is the base unit of volume of the CGS system of units. The colloquial abbreviations "cc" and "ccm" are not SI but are common in some contexts such as cooking, engine displacement and medicine.