Thecubic foot (symbolft³ orcu ft)^[1] is animperial andUS customary (non-metric)unit of volume, used in the United States and the United Kingdom. It is defined as the volume of acube with sides of onefoot (0.3048 m) inlength, or exactly28.316846592 L, which is very close to⁠1/35⁠ of acubic metre).

cubic foot
Gas meter with volume measured in cubic feet
General information
Unit system	Imperial andUS Customary
Unit of	Volume
Symbol	ft3, cu ft
Conversions
1 ft3in ...	... is equal to ...
US Customary	1728 in3 1⁄27 yd3
SI units	0.028316846592 m3

TheIEEE 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.^{[citation needed]}

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 cu ft (2.8 m³)
  • Used in thebilling ofnatural gas and water delivered to households.
• MCF:Mille (Latin thousand) cubic feet; i.e., 1,000 cu ft (28.3 m³)
• MMCF: Mille mille (= million) cubic feet; i.e., 1,000,000 cu ft (28,320 m³)
• MMCFD: MMCF per day; i.e.,1000000 ft³/d
  • Used in theoil and gas industry.
• BCF or TMC: Billion or thousand million cubic feet; i.e., 1,000,000,000 cu ft (28,320,000 m³)
  • 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.

TheIEEE 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 ordischarge 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

TheIEEE 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 carburetors,^[3] pneumatic tools, and air-compressor systems.^[4]

A standard cubic foot (abbreviated scf) is a measure of quantity of gas, sometimes^{[clarification needed]} defined in terms ofstandard temperature and pressure as a cubic foot of volume at 60 °F (16 °C; 289 K) and 14.7pounds per square inch (1.01 bar; 101 kPa) ofpressure.^{[citation needed]}