Square Foot (sq ft) to Acre

Definition

A square foot (sq ft) is a unit of area used in the U.S. customary and British imperial systems, defined as the area of a square with sides of exactly 1 foot in length.
An acre is a unit of area commonly used in land measurement, defined as exactly 43,560 square feet.

Conversion Constant

1 square foot (sq ft) = 0.0000229568411 acres
1 acre = 43,560 square feet

History

The square foot has long been a basic unit for measuring floor space, architecture, and construction in English-speaking countries.
The acre originated in the Middle Ages as the amount of land that could be ploughed by one man with an ox team in a day. Its size varied historically, but it was later standardized to 43,560 square feet in both the U.S. and the U.K. systems.