This is not a correct conversion. Cubic units is a measure of volume while square units is a measure of area.
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For 576 square feet at a depth of 4 inches, you will need 7.11 cubic yards.
136 square feet * 3 feet = 15.11... cubic yards.
9 square feet per yard x 3 =27 or 27 cubic feet per cubic yard
720 square feet at the standard 4-inch depth requires 8.9 cubic yards.
280 / 9 square yards x 2 / 36 yards = 1.7284 cubic yards (about 1 3/4 cu yds)