Square foot 699235 225545196 2008-07-14T06:38:09Z 71.42.216.139 /* Symbols */ {{otheruses3|Square (disambiguation)}} The '''square foot''' is an [[imperial unit]] / [[U.S. customary unit]] (non-[[SI]] non-[[metric system|metric]]) of [[area]], used mainly in the [[United States]] and [[United Kingdom]]. It is defined as the area of a [[Square (geometry)|square]] with sides of 1 [[foot (unit of length)|foot]] (0.333... [[yard]]s, 12 [[inch]]es, or 0.3048 [[metre]]s) in [[length]]. == Symbols == There is no universally agreed symbol but the following are used: *square feet, square foot, square ft *sq feet, sq foot, sq ft, SF *feet/-2, foot/-2, ft/-2 *feet^2, foot^2, ft^2 *feet², foot², ft² *the equation is length times width. A symbol for square foot, square feet, and "per square foot" commonly used in [[architecture]], [[real estate]] and interior space plans is a simple square with a slash through it. It is also occasionally written as a square with a vertical line bisecting it: ⏍<ref>For a list of miscellaneous technical symbols and fonts which support them, see the article [[Miscellaneous Technical (Unicode)]]</ref> 1 inch = 2.54 [[centimetre]]s 1 [[square metre]] = 10.764 square feet''''Italic text''<nowiki>Insert non-formatted text here</nowiki> == Conversions == 1 square foot is equivalent to: * A block 12 inches by 12 inches has a square foot area of 1 square foot. 12 inches is equal to 1 foot. * 144 [[square inch]]es * 1/9 [[square yard]]s * 0.01 "[[Square (building area)|squares]]". (A square is a unit used in [[Australia]] before metrication (and since) to measure the floor area of a house. 1 "square" = 100 sq ft) * ≈0.00002295684 [[acre]]s * 92 903.04 [[square millimetre]]s * 929.0304 [[square centimetre]]s * 0.09290304 [[square metre]]s * 0.000000092903040 [[square kilometre]]s == Historical Use == Before [[metrication]], the square foot was in use throughout [[Europe]], as part of the traditional [[systems of measurement|system of measurement]], which showed considerable local variation. Some examples below: * [[Bavaria]]n square foot = 0.0864751 m² * [[Prussia]]n square foot = 0.098504 m² * [[Vienna|Viennese]] square foot = 0.099921 m² * [[Paris]]ian square foot = 0.105521 m² <ref>''Das Hauslexikon'', vol. VI, Leipzig: Breitkopf und Härtel [[1837]], p. 596</ref> ==References== {{reflist}} == See also == * [[1 E-1 m²]] for a comparison with other areas * [[Cubic foot]] * [[Orders of magnitude (area)]] * [[Conversion of units]] * [[Area (geometry)]] * [[Square (algebra)]], [[square root]] [[Category:Units of area]] [[Category:Imperial units]] [[Category:Customary units in the United States]] [[ast:Pie cuadráu]] [[bg:Квадратен фут]] [[de:Quadratfuß]] [[es:Pie cuadrado]] [[gl:Pé cadrado]] [[hu:Négyzetláb]] [[ja:フィート#.E5.B9.B3.E6.96.B9.E3.83.95.E3.82.A3.E3.83.BC.E3.83.88]] [[no:Kvadratfot]] [[pt:Pé quadrado]] [[vi:Ft²]] [[zh:平方英尺]]