Cubic foot

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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.

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[edit]

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[edit]

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

See also cubic metre per second

Cubic foot per minute[edit]

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[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: Standard cubic foot per minute

See also[edit]


  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.