Cubic foot

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 (0.3048 m) in length. Its volume is 28.3168 L (about ​1⁄35 of a cubic metre).

Cubic foot
Unit systemImperial and US Customary
Unit ofVolume
Symbolft3 or cu ft 
Conversions
1 ft3 in ...... is equal to ...
   U.S. customary   ​1⁄27 yd3
   SI units   0.02832 m3

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

Conversions
1 cubic foot  = 1728 cubic inches
= ​1⁄27 of a cubic yard
≈ 0.037037 yd3
= 0.0283 m3
= 28.3168 L
= ​576⁄77 US fluid gallons
= ​1728⁄231 US fl gal
≈ 7.480519 US fl gal
= ​73728⁄77 US fluid ounces
≈ 957.51 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: 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.

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

  • CCF or HCF: Centum (Latin hundred) cubic feet; i.e., 100 ft3
    • Used in the billing of natural gas and water delivered to households.
  • MCF: Mille (Latin thousand) cubic feet; i.e., 1000 ft3
  • MMCF: Mille mille cubic feet; i.e., 1000000 ft3
  • MMCFD: MMCF per day; i.e., 1000000 ft3/d
    • Used in the oil and gas industry.
  • BCF or TMC: Billion or thousand million cubic feet; i.e., 1000000000 ft3
    • TMC is usually used for referring to storage capacity and actual storage volume of storage dams.
  • TCF: Trillion cubic feet; i.e, 1000000000000 ft3
    • Used in the oil and gas industry.
"Cusec" redirects here. For other uses, see Canadian University Software Engineering Conference.

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

  • cu ft/s
  • ft3/sec
  • CFS or cfs
  • cusec

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 measure of flow rate and is informal shorthand for "cubic feet per second"[2] (28.317 litres per second).[2] In the United States it is generally applied to water flow, particularly in rivers and canals. Other informal synonyms are cfs and second-feet.

  • 1 ft3s−1 = 0.028316847 m3⋅s−1 = 28.316847 L⋅s−1
  • 1 cusec = 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:

  • CFPM
  • CFM
  • cufm

Cubic feet per minute is used to measure the amount of air that's being delivered and is a common metric used for carburettors,[3] pneumatic tools, and air compressor systems.[4]

Standard cubic foot
Main articles: Standard cubic foot and Standard cubic foot per minute

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 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

References
  1. "IEEE Standard Letter Symbols for Units of Measurement (SI Customary Inch-Pound Units, and Certain Other Units)" (PDF or hardcopy). ieee.org (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. , ISBN 978-0-7381-3997-5, ISBN 978-0-7381-3998-2.
  2. "Units: C", The University of North Carolina at Chapel Hill, webpage: UNC-Rowlett.
  3. ""Carburetor CFM Racing"". "Summit Racing". Retrieved 2019-02-07.
  4. "Easy Guide To Rotary Screw Air Compressors For Vehicles – By VMAC". VMAC. 2018-10-16. Retrieved 2018-10-30.
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