There are 160 square rods in an acre. (see the customary English units below)
1 international acre is equal to the following metric units:
1 United States survey acre is equal to:
1 acre (both variants) is equal to the following customary units:
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640 acres, algebraic steps below: 1 mi²*640 acres 1 mi²=640 acres
One square mile is equal to 640 acres of water.
There are 640 acres in 1 square mile.
One square mile equates to 640 acres.
Answer: 640 acres = 1 square mile.