Cubic inches is a measure of volume and square feet is a measure of length, the two do not lend to converting from one to the other. Your question is like "how many cups of milk are there is 2 square feet of milk?"
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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.
A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
it's either 2,000 square inches, 2,000 square feet, 2,000 cubic inches, or 2,000 cubic feet
If you are talking about a shape with an area of 7500 square feet and a thickness of 6 inches, the shape has a volume of 3750 cubic feet.
Cubic inches measures volume. Square inches measures area. Therefore, you can not compare the two. It is like comparing feet and cups.