The square foot is an imperial unit / U.S. customary unit (nonSI nonmetric) of area, used mainly in the United States, the United Kingdom, Hong Kong, Japan, Afghanistan 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 onefamily house in the United States in 2007 had a total floor area of approximately 2500 square feet.^{[1]}
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 vertical line bisecting it. It is also occasionally written as a square with a slash through it.
1 square foot is equivalent to:
