how many acres make a mile
1 â 640 (0.0015625) square mile (1 square mile is equal to 640 acres) Perhaps the easiest way for US residents to envision an acre is as a rectangle measuring 88 yards by 55 yards ( 1 â 10 of 880 yards by 1 â 16 of 880 yards), about 9 â 10 the size of a standard American football field.