You don't, square feet are a measure of area and cubic feet are a measure of volume.
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You simply can't convert square units to cubic units.
You can't convert that. You can convert linear units to linear units, square units to square units, or cubic units to cubic units.
You don't. You either A) convert 18 cubic inches into cubic feet, or B) convert 18 square inches into square feet. A... there are 1728 cubic inches in a cubic foot, so 18 cu in would be 0.00104 cu ft. B... there are 144 square inches in a square foot, so 18 square inches would be 0.125 sq ft.
You cannot do that since cubic yard is volume and square foot is area. You need to know the thickness
Square foot is a measure of area. Cubic foot is a measure of volume. They are not equal.