The cubic foot (symbol ft<sup>3</sup> or cu ft) is an imperial and US customary (non-metric) unit of volume, used in the United States and the United Kingdom. It is defined as the volume of a cube with sides of one foot () in length, or exactly (which differs by about 1% from <!--1/35.315--> of a cubic metre, making that a suitable approximation in many cases).

Conversions

{|-

|valign=top rowspan=15|1 cubic foot&nbsp;

|colspan=2|≡ 1728 cubic inches

|-

|colspan=2 height=30pt|≡ of a cubic yard

|-

|colspan=2|≡

|-

|colspan=2 height=30pt|≡ US gallons

|-

|colspan=2 height=30pt|≡ US fluid ounces

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|colspan=2|≈

|-

|colspan=2|≈

|-

|colspan=2|≡ US bushels

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|colspan=2|≈

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|colspan=2|≡ oil barrel

|}

Symbols and abbreviations

The IEEE symbol for the cubic foot is ft<sup>3</sup>. The following abbreviations are used: cubicfeet, cubicfoot, cubicft, cufeet, cufoot, cuft, cu.ft, cuft, cbft, cb.ft, cbft, cbf, feet, foot, ft, feet/-3, foot/-3, ft/-3.

Larger multiples are in common usage in commerce and industry in the United States:

  • CCF or HCF: Centum (Latin hundred) cubic feet; i.e.,
  • Used in the billing of natural gas and water supply delivered to households.
  • MCF: Mille (Latin thousand) cubic feet; i.e.,
  • MMCF: Mille mille (= million) cubic feet; i.e.,
  • MMCFD: MMCF per day; i.e.,
  • Used in the oil and gas industry.
  • BCF or TMC: Billion or thousand million cubic feet; i.e.,
  • TMC is usually used for referring to storage capacity and actual storage volume of storage dams.
  • TCF: Trillion cubic feet; i.e.,
  • Used in the oil and gas industry.

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The IEEE symbol for the cubic foot per second is ft<sup>3</sup>/s. The following other abbreviations are also sometimes used:

  • ft<sup>3</sup>/sec
  • cu&nbsp;ft/s
  • cfs or CFS
  • cusec
  • second-feet

The flow or discharge of rivers, i.e., the volume of water passing a location per unit of time, is commonly expressed in units of cubic feet per second or cubic metres per second.

Cusec is a unit of flow rate, used mostly in the United States in the context of water flow, particularly of rivers and canals.

Conversions: 1&nbsp;ft<sup>3</sup>/s = = = =

Cubic foot per minute

The IEEE symbol for the cubic foot per minute is ft<sup>3</sup>/min. The following abbreviations are used:

  • cu&nbsp;ft/min
  • cfm or CFM
  • cfpm or CFPM

Cubic feet per minute is used to measure the amount of air that is being delivered, and is a common metric used for carburetors, pneumatic tools, and air-compressor systems.

Standard cubic foot

A standard cubic foot (abbreviated scf) is a measure of quantity of gas, sometimes defined in terms of standard temperature and pressure as a cubic foot of volume at and of pressure.

See also

  • Board foot
  • Conversion of units
  • Cord (unit)
  • Cube (arithmetic), cube root
  • Cubic inch
  • Cubic yard
  • Orders of magnitude (volume) for a comparison with other volumes
  • Orders of magnitude (one cubic millimetre to one cubic metre)
  • Square foot
  • Therm, a unit of natural gas approximately equal to 100 cubic feet
  • Cubic metre per second

References

ja:フィート#立方フィート