Square foot

For other uses, see Square.

The square foot is an Imperial unit / U.S. customary unit (non-SI non-metric) of area, used in the United States, United Kingdom and elsewhere. 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 Height.

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.

Conversions

1 square foot is equivalent to:

• A block 12 inches by 12 inches has a square foot area of 1 square foot.
• 144 square inches
• ≈0.111 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

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

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