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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.
For example, if a rectangular plot had a length of 110 feet and a width of 115 feet, the plot would be 12,650 square feet. Divide the number obtained in Step 2 by 43,560. The number 43,560 is a constant used to convert square feet to acres.