Cubic foot

cubic foot
Unit system	Imperial and US Customary
Unit of	Volume
Symbol	ft3, cu ft
Conversions
1 ft3 in ...	... is equal to ...
US Customary	1728 in3 1⁄27 yd3
SI units	0.02831685 m3

The cubic foot (symbol ft³ or cu ft)<ref name="IEEE">IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units) (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. Archived from the original (PDF or hardcopy) on 2018-06-12. Retrieved 22 December 2019. [1], ISBN 978-0-7381-3997-5, ISBN 978-0-7381-3998-2.</ref> 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).

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.<ref name="IEEE" group=""></ref> 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
  • 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.

Cubic foot per second and related flow rates

The IEEE symbol for the cubic foot per second is ft³/s.<ref name="IEEE" group=""></ref> 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,<ref name="Row">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.</ref> 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.<ref name="IEEE" group=""></ref> 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,<ref>"Carburetor CFM Racing". Summit Racing. Archived from the original on April 27, 2021. Retrieved February 7, 2019.</ref> pneumatic tools, and air-compressor systems.<ref>"Easy Guide to Rotary Screw Air Compressors for Vehicles". VMACAir.com. October 16, 2018. Retrieved October 30, 2018.</ref>

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

• Board foot
• Conversion of units
• Cord (unit)
• Cube (arithmetic), cube root
• Cubic inch
• Cubic yard
• Orders of magnitude (volume) for a comparison with other volumes
  • Orders of magnitude (one cubic millimetre to one cubic metre)
• Square foot
• Therm, a unit of natural gas approximately equal to 100 cubic feet
• Cubic metre per second