1 acre = 43,560 sq.ft.
1 acre = 4048.85 sq.m.
1 acre = 4840 sq.y.
An acre is as a rectangle measuring 208.71 feet × 208.71 feet (a square) or 66 feet × 660 feet or 88 yards by 55 yards (1⁄10 of 880 yards by 1⁄16 of 880 yards), approximately the size of a standard American football field.