A cubic foot is an Imperial / U.S. customary (non-metric) unit of volume, used in both the United States and the UK. It is defined as the volume of a cube with sides of 1 foot (0.3048 metres) in length.

Symbols

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There is no universally agreed symbol but the following are used:

• cubic feet, cubic foot, cubic ft
• cu ft, cu feet, cu foot
• ft³, feet³, foot³
  • feet^3, foot^3, ft^3
  • feet/-3, foot/-3, ft/-3

Conversions

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1 cubic foot is equivalent to:

• 1728 cubic inches
• ≈ 0.037 cubic yards (exactly: 1/27)
• ≈ 0.803563913 U.S. bushels
• 7.480519480519 U.S. liquid gallons (exactly: 1728/231)
• ≈ 0.178107606679 crude barrels
• 28.316846592 litres
• 0.028316846592 cubic metres

Standard cubic foot

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A standard cubic foot is sometimes but not always a cubic foot of volume at 60 degrees Fahrenheit and 14.7 pounds per square inch (PSI) of pressure. The standard cubic foot is used to measure quantities of gas. See standard temperature and pressure.

Trillion cubic feet, commonly abbreviated as Tcf, is used in the oil and gas industry. The term trillion in this case refers to 10¹², the short scale definition employed by most English speaking countries.

See also

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• 1 E-2 m³ for a comparison with other volumes
• Orders of magnitude (volume)
• Conversion of units
• Cube (arithmetic), cube root
• Square foot

Units of volume | Imperial units | Customary units in the United States

Kubikfuß | 立方フィート