Cubic foot


The cubic foot is an imperial and US customary 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 in length, or exactly .

Conversions

Symbols and abbreviations

The IEEE symbol for the cubic foot is ft3. The following abbreviations are used: cubicfeet, cubicfoot, cubicft, cufeet, cufoot, cuft, cu.ft, cuft, cbft, cb.ft, cbft, cbf, feet, foot, ft, feet/-3, foot/-3, ft/-3.
Larger multiples are in common usage in commerce and industry in the United States:
  • CCF or HCF: Centum cubic feet; i.e.,
  • * Used in the billing of natural gas and water supply delivered to households.
  • MCF: Mille cubic feet; i.e.,
  • MMCF: Mille mille cubic feet; i.e.,
  • MMCFD: MMCF per day; i.e.,
  • * Used in the oil and gas industry.
  • BCF or TMC: Billion or thousand million cubic feet; i.e.,
  • * TMC is usually used for referring to storage capacity and actual storage volume of storage dams.
  • TCF: Trillion cubic feet; i.e.,
  • * 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. 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, used mostly in the United States in the context of water flow, particularly of rivers and canals.
Conversions: 1 ft3/s = = = =

Cubic foot per minute

The IEEE symbol for the cubic foot per minute is ft3/min. The following abbreviations are used:
  • cu ft/min
  • 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, pneumatic tools, and air-compressor systems.

Standard cubic foot

A standard cubic foot is a measure of quantity of gas, sometimes defined in terms of standard temperature and pressure as a cubic foot of volume at and of pressure.