Cubic Foot
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Cubic Foot
Cubic foot
Unit systemImperial and US Customary
Unit ofVolume
Symbolft3 or cu ft 
U.S. customary​ yd3
SI units0.02832 m3

The cubic foot (symbol ft3)[1] 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. Its volume is (about ​ of a cubic metre).

At 60 °F (16 °C), a cubic foot of water weighs 62.37 pounds (28.29 kg).


1 cubic foot  = 1728 cubic inches
= ​ of a cubic yard
? yd3
= m3
= L
= ​ US fluid gallons
= ​ US fl gal
? US fl gal
= ​ US fluid ounces
? US fl oz
? 6.2288 imperial gallons
? 996.61 imperial fluid ounces
? 0.80356 US bushels
? 0.17811 oil barrel

Symbols and abbreviations

The IEEE symbol for the cubic foot is ft3.[1] The following abbreviations are used: cubicfeet, cubicfoot, cubicft, cufeet, cufoot, cuft, cu.ft, cuft, cbft, cb.ft, cbft, cbf, feet3, foot3, ft3, feet/-3, foot/-3, ft/-3.[]

Larger multiples are in common usage in commerce and industry in the USA:

  • CCF or HCF: Centum (Latin hundred) cubic feet; i.e.,
  • MCF: Mille (Latin thousand) cubic feet; i.e.,
  • MMCF: Mille mille cubic feet; i.e.,
  • MMCFD: MMCF per day; i.e., /d
  • 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.

Cubic foot per second and related flow rates

The IEEE symbol for the cubic foot per second is ft3/s.[1] The following other abbreviations are also sometimes used:

  • ft3/sec
  • cu 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,[2] used mostly in the United States in the context of water flow, particularly of rivers and canals.

Conversions: 1 ft3s-1 = 0.028316847 m3?s-1 = 28.316847 L?s-1 = 1.699 m3?min-1 = 1699 L?min-1

Cubic foot per minute

The IEEE symbol for the cubic foot per minute is ft3/min.[1] The following abbreviations are used:

  • cu ft/min
  • cufm
  • 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 carburettors,[3] pneumatic tools, and air-compressor systems.[4]

Standard cubic foot

A standard cubic foot (abbreviated scf) is a measure of quantity of gas, sometimes[clarification needed] defined in terms of standard temperature and pressure as a cubic foot of volume at 60 degrees Fahrenheit (15.56 °C; 288.71 K) and 14.7 pounds per square inch (PSI) (1.01 bar; 101.35 kPa) of pressure.[]

See also


  1. ^ a b c d IEEE Standard Letter Symbols for Units of Measurement (SI Customary Inch-Pound Units, and Certain Other Units) (PDF or hardcopy). (Revision of IEEE Std 260.1-1993). IEEE Std 260.1-2004 (2004 ed.). Piscataway, N.J.: IEEE. 2004-09-24. pp. 1-30. doi:10.1109/IEEESTD.2004.94618. ISBN 978-1-5044-0928-5. STD95220 STDPD95220 STDPL95220. Retrieved 2019.[1], ISBN 978-0-7381-3997-5, ISBN 978-0-7381-3998-2.
  2. ^ Rowlett, Russ. "Units: C". How Many? A Dictionary of Units of Measurement. University of North Carolina at Chapel Hill. Archived from the original on January 9, 2018. Retrieved 2020.
  3. ^ "Carburetor CFM Racing". Summit Racing. Retrieved 2019.
  4. ^ "Easy Guide to Rotary Screw Air Compressors for Vehicles". October 16, 2018. Retrieved 2018.

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