View source for Cubic foot

{{Short description|Imperial and US customary (non-metric) unit of volume}}
{{Infobox unit
| bgcolor = 
| name = cubic foot
| image = Gas meter indicator.jpg
| caption = [[Gas meter]] with volume measured in cubic feet
| standard = [[Imperial units|Imperial]] and [[US Customary]]
| quantity = [[Volume]]
| symbol = ft<sup>3</sup>
| symbol2 = cu ft
| units1 = [[US Customary]]
| inunits1 = 1728 in<sup>3</sup><br/>{{frac|27}} yd<sup>3</sup>
| units2 = [[SI units]]
| inunits2 = {{convert|1|ft3|sigfig=11|disp=out|comma=gaps}}
}}
The '''cubic foot''' (symbol '''ft<sup>3</sup>''' or '''cu ft''')<ref name="IEEE">{{cite book |url=https://standards.ieee.org/findstds/standard/260.1-2004.html |title=IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units) |date=2004-09-24 |publisher=[[IEEE]] |isbn=978-1-5044-0928-5 |edition=2004 |series=IEEE Std 260.1-2004 |location=Piscataway, N.J. |pages=1–30 |type=Revision of IEEE Std 260.1-1993 |format=PDF or hardcopy |doi=10.1109/IEEESTD.2004.94618 |id=STD95220 STDPD95220 STDPL95220 |access-date=22 December 2019 |url-access=subscription |archive-url=https://web.archive.org/web/20180612141002/http://standards.ieee.org/findstds/standard/260.1-2004.html |archive-date=2018-06-12 |url-status=dead}} [https://ieeexplore.ieee.org/document/1337729], {{isbn|978-0-7381-3997-5}}, {{isbn|978-0-7381-3998-2}}.</ref> is an [[Imperial unit|imperial]] and [[United States customary units|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 (length)|foot]] ({{val|0.3048|u=m}}) in [[length]], or exactly {{convert|1|ft3|L|sigfig=11|disp=out|comma=gaps}}, which is very close to {{sfrac|35}}<!--1/35.315--> of a [[cubic metre]]). 

==Conversions==
{|-
|valign=top rowspan=15|1 cubic foot&nbsp;
|colspan=2|≡ 1728 [[cubic inch]]es
|-
|colspan=2 height=30pt|≡ {{sfrac|27}} of a [[cubic yard]]
|-
|colspan=2|≡ {{convert|1|ft3|L|sigfig=11|disp=out|comma=gaps|lk=out}} 
|-
|colspan=2 height=30pt|≡ {{sfrac|7|37|77}} US [[gallon]]s
|-
|colspan=2 height=30pt|≡ {{sfrac|957|39|77}} US [[fluid ounce]]s
|-
|colspan=2|≈ {{convert|1|ft3|impgal|sigfig=7|disp=out|comma=gaps|abbr=off}} 
|-
|colspan=2|≈ {{convert|1|ft3|impfloz|sigfig=7|disp=out|comma=gaps|abbr=off}} 
|-
|colspan=2|≡ {{sfrac|86400|107521}} US [[bushel]]s
|-
|colspan=2|≈ {{convert|1|ft3|impbu|sigfig=7|disp=out|comma=gaps|abbr=off|lk=out}} 
|-
|colspan=2|≡ {{sfrac|96|539}} oil [[barrel (unit)|barrel]]
|}

== Symbols and abbreviations ==
The [[Institute of Electrical and Electronics Engineers|IEEE]] symbol for the cubic foot is ft<sup>3</sup>.{{r|IEEE}} The following abbreviations are used: cubic{{nbsp}}feet, cubic{{nbsp}}foot, cubic{{nbsp}}ft, cu{{nbsp}}feet, cu{{nbsp}}foot, cu{{nbsp}}ft, cu.ft, cuft, cb{{nbsp}}ft, cb.ft, cbft, cbf, feet{{sup|3}}, foot{{sup|3}}, ft{{sup|3}}, feet/-3, foot/-3, ft/-3.{{citation needed|date=February 2020}}

Larger multiples are in common usage in commerce and industry in the United States:

* CCF or HCF: [[wikt:centum#Latin|''Centum'']] (Latin hundred) cubic feet; i.e., {{cvt|100|cuft|1}}
** Used in the [[bill (payment)|billing]] of [[natural gas|methane gas]] and water delivered to households.
* MCF: [[wikt:mille#Latin|''Mille'']] (Latin thousand) cubic feet; i.e., {{cvt|1000|cuft|1}}
* MMCF: Mille mille (= million) cubic feet; i.e., {{cvt|1000000|cuft|-1}} 
* MMCFD: MMCF per day; i.e., {{val|1000000|u=ft{{sup|3}}}}/d
** Used in the [[oil industry|oil and gas industry]].
* BCF or TMC: Billion or thousand million cubic feet; i.e., {{cvt|1000000000|cuft|-4}}
** [[Tmcft|TMC]] is usually used for referring to storage capacity and actual storage volume of storage dams.
* TCF: Trillion cubic feet; i.e., {{val|1000000000000|u=ft{{sup|3}}}}
** Used in the oil and gas industry.

=={{anchor|Cubic foot per second}}Cubic foot per second and related flow rates==
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The [[Institute of Electrical and Electronics Engineers|IEEE]] symbol for the cubic foot per second is ft<sup>3</sup>/s.{{r|IEEE}} The following other abbreviations are also sometimes used:
* ft<sup>3</sup>/sec
* cu&nbsp;ft/s
* cfs or CFS 
* cusec
* second-feet

The flow or [[Discharge (hydrology)|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">{{cite web |title=Units: C |work=How Many? A Dictionary of Units of Measurement |first=Russ |last=Rowlett |publisher=[[University of North Carolina at Chapel Hill]] |url= http://www.unc.edu/~rowlett/units/dictC.html |url-status=dead |archive-url= https://web.archive.org/web/20180109055857/http://www.unc.edu/~rowlett/units/dictC.html |archive-date=January 9, 2018 |access-date=August 2, 2020}}</ref> used mostly in the United States in the context of water flow, particularly of rivers and canals.

Conversions: 1&nbsp;ft<sup>3</sup>s<sup>−1</sup> = {{cvt|1.000000|ft3/s|m3/s|disp=out}} = {{cvt|1.000000|ft3/s|L/s|disp=out}} = {{cvt|1.000000|ft3/s|m3/min|disp=out}} = {{cvt|1.000000|ft3/s|L/min|disp=out}}

=== Cubic foot per minute ===
The [[Institute of Electrical and Electronics Engineers|IEEE]] symbol for the cubic foot per minute is ft<sup>3</sup>/min.{{r|IEEE}} The following abbreviations are used:
* cu&nbsp;ft/min
* {{notatypo|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,<ref>{{Cite web |url=https://help.summitracing.com/app/answers/detail/a_id/4767/~/carburetor-cfm-rating |title=Carburetor CFM Racing |work=Summit Racing |author=<!--No author given--> |access-date=February 7, 2019 |archive-date=April 27, 2021 |archive-url=https://web.archive.org/web/20210427053908/https://help.summitracing.com/app/answers/detail/a_id/4767/~/carburetor-cfm-rating |url-status=dead }}</ref> pneumatic tools, and air-compressor systems.<ref>{{Cite news |url= https://www.vmacair.com/blog/easy-guide-to-rotary-screw-air-compressors-for-trucks-vans/|title=Easy Guide to Rotary Screw Air Compressors for Vehicles |date=October 16, 2018 |work=VMACAir.com |access-date=October 30, 2018}}</ref>

== Standard cubic foot ==
{{Main|Standard cubic foot}}
{{See also|Standard cubic foot per minute}}
A standard cubic foot (abbreviated scf) is a measure of quantity of gas, sometimes{{clarify|date=January 2015}} defined in terms of [[standard temperature and pressure]] as a cubic foot of volume at {{convert|60|F|C K|lk=in}} and {{convert|14.7|psi|bar kPa|lk=on}} of [[pressure]].{{citation needed|date=January 2015}}

== See also ==
{{Div col}}
* [[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]]

{{div col end}}

==References==
{{Reflist}}

{{Imperial units}}
{{United States Customary Units}}
{{Authority control}}

{{DEFAULTSORT:Cubic Foot}}
[[Category:Units of volume]]
[[Category:Imperial units]]
[[Category:Customary units of measurement in the United States]]
[[Category:Units of flow]]
[[Category:Physical quantities]]

[[ja:フィート#立方フィート]]