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The square foot is an imperial unit / U.S. customary unit (non-SI non-metric) of area, used mainly in the United States, the United Kingdom, and Canada. 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. For comparison, the average one-family house in the United States in 2007 had a total floor area of approximately 2500 square feet.[1]

## Symbols Edit

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

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 meter = 10.764 square feet

## Conversions Edit

1 square foot is equivalent to:

## Historical Use Edit

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:

## References / sourcesEdit

1. http://www.census.gov/const/C25Ann/sftotalmedavgsqft.pdf
2. Das Hauslexikon, vol. VI, Leipzig: Breitkopf und Härtel 1837, p. 596

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