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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 feet by how many feet equals 1 acre? 43559.45382 ft = 1 acre. square root of 43559.45832 sq ft = 208.73 ft-The U.S. acre is actually an even 43,560 (66x660 or 1/8 mi. by 1/80th).