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Cubic foot - Wikipedia

The cubic foot (symbol ft3 or cu ft)[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 (0.3048 m) in length. Its volume is 28.3168 L (about 1⁄35 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 = 1⁄27 of a cubic yard ≈ 0.037037 yd3 = 0.028316846592 m3 = 28.316846592 L = 576⁄77 US fluid gallons ≈ 7.4805 US fl gal = 73728⁄77 US fluid ounces ≈ 957.5065 US fl oz ≈ 6.2288 imperial gallons ≈ 996.61 imperial fluid ounces ≈ 0.80356 US bushels ≈ 0.17811 oil barrel

Symbols and abbreviations[edit]

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

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

Cubic foot per second and related flow rates[edit]

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

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


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

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[edit]

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.[citation needed]

See also[edit]


  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 22 December 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 August 2, 2020.
  3. ^ "Carburetor CFM Racing". Summit Racing. Retrieved February 7, 2019.
  4. ^ "Easy Guide to Rotary Screw Air Compressors for Vehicles". October 16, 2018. Retrieved October 30, 2018.