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The acre is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (22 yards) by 1 furlong (220 yards), which is exactly equal to 1â640 of a square mile, approximately 4,046.856 m 2, or about 40% of a hectare.ne acre equals 0.0015625 square miles, 4,840 square yards, 43,560 square feet or about 4,047 square metres (0.405 hectares) (see below).
There are 43,560 square feet in one acre.   An acre is a unit of area. 640 acres equal a square mile. Hence, it is 1/640 of a square mile. Since a square mile contains 2 â¦ 7,878,400 square feet, an acre is 27,878,400 divided by 640, which is 43,560 square feet. Remember: an acre can be converted to SQUARE feet, not plain (linear) feet. Square feet and feet are not the same units.