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 partially in Canada, 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 liters or about 135 of a cubic meter.

Cubic foot
Unit systemImperial and US Customary
Unit ofVolume
Symbolft3orcu ft
1 ft3 in ...... is equal to ...
   Imperial and US customary   127 yd3
   SI units   0.02831685 m3

At 60 °F (16 °C), a cubic foot of water weighs 62.36630 pounds (28.28888 kg).


1 cubic foot  = 1728 cubic inches
= 127 of a cubic yard
0.037037 cu yd
= 0.028316846592 cubic meters
= 28.316846592 liters
= 57677 US fluid gallons
= 1728231 US fl gal
7.4805 US fl gal
= 7372877 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.[2] 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:

Centum, or hundred, cubic feet; i.e., 100 ft3. Latin centum meaning a hundred. Used in the billing of natural gas and water delivered to households.
Mille cubic feet; i.e., 1000 ft3. Latin mille meaning a thousand.
Mille mille cubic feet; i.e., 1000000 ft3.
MMCF per day; i.e., 1000000 ft3/day. Used in the oil and gas industry.
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.
Trillion cubic feet; i.e, 1000000000000 ft3. Used in the oil and gas industry.

Cubic foot per second

The IEEE symbol for the cubic foot per second is ft3/s.[3] 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 meters per second.

See also cubic metre per second

Cubic foot per minute

The IEEE symbol for the cubic foot per minute is ft3/min.[4] The following abbreviations are used:

  • CFPM
  • CFM

Cubic feet per minute is used to measure the amount of air that's being delivered and is a common metric used for carburetors, [5] pneumatic tools, and air compressor systems.[6]

Standard cubic foot

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: Standard cubic foot per minute

See also


  1. IEEE Std 260.1-2004
  2. IEEE Std 260.1-2004
  3. IEEE Std 260.1-2004
  4. IEEE Std 260.1-2004
  5. ""Carburetor CFM Racing"". "Summit Racing". Retrieved 2019-02-07.
  6. "Easy Guide To Rotary Screw Air Compressors For Vehicles – By VMAC". VMAC. 2018-10-16. Retrieved 2018-10-30.
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