None.
A pound is a measure of mass. A cubic foot is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a cubic foot of air. How many pounds? Next consider a cubic foot of lead. How many pounds ?
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Knowing that 1 cubic foot is pretty much equal to 100 pounds or 0.05 ton, 1 ton of gravel is around 20 cubic feet.
54,600 cubic inches is equal to approximately 31.6 cubic feet.
7,776 cubic inches.
One cubic foot is equal to 123 = 1728 cubic inches. Therefore, 6 cubic feet is equal to 6 x 1728 = 10368 cubic inches.
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