Cubic foot

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).

cubic foot
Unit systemImperial and US Customary
Unit ofVolume
Symbolft3, cu ft
Conversions
1 ft3 in ...... is equal to ...
   US Customary   1728 in3
1⁄27 yd3
   SI units   0.02831685 m3

Conversions
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

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 United States:

  • CCF or HCF: Centum (Latin hundred) cubic feet; i.e., 100 ft3
  • 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
  • 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.

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 = 0.0283168 m3/s = 28.3168 L/s = 1.699011 m3/min = 1,699.011 L/min

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
Main article: Standard cubic foot
See also: 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 Units, Customary Inch-Pound Units, and Certain Other Units). 2004-09-24. pp. 1–30. doi:10.1109/IEEESTD.2004.94618. ISBN 978-1-5044-0928-5. STD95220 STDPD95220 STDPL95220. Archived from the original (PDF or hardcopy) on 2018-06-12. Retrieved 22 December 2019. {{cite book}}: |website= ignored (help) , 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". VMACAir.com. October 16, 2018. Retrieved October 30, 2018.
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