- published: 06 Mar 2014
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The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. Its international symbol is ac.
The most commonly used acres today are the international acre and, in the United States, the survey acre. The most common use of the acre is to measure tracts of land. One international acre is equal to 4046.8564224 square metres.
During the middle ages, an acre was the amount of land that could be plowed in one day with an ox.
The acre is related to the square mile, with 640 acres making up one square mile. One mile is 5280 feet (1760 yards). Divisions of land area were typically based on the square mile, and fractions thereof. If the square mile is divided into quarters, each quarter has a side length of 1⁄2 mile (880 yards) and is 1⁄4 square mile in area, or 160 acres. These subunits would typically then again be divided into quarters, with each side being 1⁄4 mile long, and being 1⁄16 of a square mile in area, or 40 acres. In the United States, farmland was typically divided as such, and the phrase "the back 40" would refer to the 40 acre parcel to the back of the farm. Most of the US midwest is on square mile grids for surveying purposes.
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