View source for Cubic foot

{{Short description|Imperial and US customary (non-metric) unit of volume}}
{{Infobox unit
| bgcolor = 
| name = cubic foot
| image = 
| caption = 
| 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=7|disp=out}}
}}
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 |date=2004-09-24 |publisher=[[IEEE]] |series=IEEE Std 260.1-2004 |pages=1–30 |type=Revision of IEEE Std 260.1-1993 |format=PDF or hardcopy |location=Piscataway, N.J. |doi=10.1109/IEEESTD.2004.94618 |isbn=978-1-5044-0928-5 |id=STD95220 STDPD95220 STDPL95220 |url-access=subscription |access-date=22 December 2019 |edition=2004 |archive-date=2018-06-12 |archive-url=https://web.archive.org/web/20180612141002/http://standards.ieee.org/findstds/standard/260.1-2004.html |url-status=dead |title=IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units) }} [https://ieeexplore.ieee.org/servlet/opac?punumber=9287], {{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]]. Its volume is {{val|28.3168|u=L}} (about {{frac|35}}<!--1/35.315--> of a [[cubic metre]]).

==Conversions==
{{more citations needed|section|date=December 2019}}
{|-
|valign=top rowspan=14|1 cubic foot&nbsp;
|colspan=2|= 1728 [[cubic inch]]es
|-
|colspan=2 height=30pt|= {{frac|27}} of a [[cubic yard]]
|-
|width=15pt|
|≈ {{val|0.037037}} yd<sup>3</sup>
|-
|colspan=2|= {{val|0.028316846592}} [[cubic metre|m<sup>3</sup>]]
|-
|||= {{val|28.316846592}} [[liter|L]]
|-
|colspan=2 height=30pt|= {{frac|576|77}} US fluid [[gallon]]s
|-
|||≈ {{val|7.4805}} US fl gal
|-
|colspan=2 height=30pt|= {{frac|73728|77}} US [[fluid ounce]]s
|-
|||≈ {{val|957.5065}} US fl oz
|-
|colspan=2|≈ 6.2288 imperial gallons
|-
|colspan=2|≈ 996.61 imperial fluid ounces
|-
|colspan=2|≈ 0.80356 US [[bushel]]s
|-
|colspan=2|≈ 0.17811 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., {{val|100|u=ft{{sup|3}}}}
** Used in the [[bill (payment)|billing]] of [[natural gas]] and water delivered to households.
* MCF: [[wikt:mille#Latin|''Mille'']] (Latin thousand) cubic feet; i.e., {{val|1000|u=ft{{sup|3}}}}
* MMCF: Mille mille cubic feet; i.e., {{val|1000000||u=ft{{sup|3}}}}
* 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., {{val|1000000000|u=ft{{sup|3}}}}
** [[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==
<!-- This Anchor tag serves to provide a permanent target for incoming section links. Please do not remove it, nor modify it, except to add another appropriate anchor.  If you modify the section title, please anchor the old title. It is always best to anchor an old section header that has been changed so that links to it will not be broken. See [[Template:Anchor]] for details. This template is {{subst:Anchor comment}} -->
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 carburettors,<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 60 degrees [[Fahrenheit]] ({{convert|60|F|C K|2|disp=output only}}) and 14.7 [[Pound-force per square inch|pounds per square inch]] (PSI) ({{convert|14.7|psi|bar kPa|2|lk=on|disp=output only}}) 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]]