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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).
Now that we know a bit about acres and square feet, we can move to conversion of these units and find out how many square feet there are in an acre. One US customary acre is equivalent to 43 560 square feet, 4840 square yards, or about 4047 square meters. There are also some other types of acres, used in various countries: Irish acre (7843 yd), Roman acre (1260 m), Cheshire acre (10240 yd), etc.