square foot
The square foot is an imperial unit / U.S. customary unit (non-SI non-metric) of area, used mainly in the United States and United Kingdom. It is defined as the area of a square with sides of 1 foot (0.333... yards, 12 inches, or 0.3048 metres) 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:
1 inch = 2.54 centimetres
1 square metre = 10.764 square feet
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 inches
1/9 square yards
0.01 "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 acres
92 903.04 square millimetres
929.0304 square centimetres
0.09290304 square metres
0.000000092903040 square kilometres
Historical Use
Before metrication, the square foot was in use throughout Europe, as part of the traditional system of measurement, which showed considerable local variation. Some examples below:
Bavarian square foot = 0.0864751 m²
Prussian square foot = 0.098504 m²
Viennese square foot = 0.099921 m²
Parisian square foot = 0.105521 m² [Das Hauslexikon, vol. VI, Leipzig: Breitkopf und Härtel 1837, p. 596]
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
Miscellaneous Technical (Unicode) for a list of miscellaneous technical symbols and fonts which support the square foot symbol
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