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A: Acres are measured in square feet, and there are 43,560 square feet in 1 acre. If the acre of land is perfectly square, each side will be just under 209 feet long. To calculate square footage in order to determine if a square piece of land is 1 or more acres, measure two sides and multiply the numbers together.
How many square feet in an acre? Acres to square feet area measurement units conversion table shows the most common values for the quick reference. Alternatively, you may use the converters below to convert any other values. 1 Acre = 43 560 Square Feet. Acre is an imperial and U.S. customary system area unit.