None. A cubic foot is a measure of volume. An inch is a measure of distance. The two measure different things and there is no sensible way to convert one to the other.
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3.14 x 12 x 12/4 x 30/12 cu ft x 7.5 gallons per cu ft = 2120 gallons
If you meant cu. in to cu. ft.divide by 1728.
For 1 foot deep, 400 cu ft. For 3 inches deep, 100 cu ft.
Multiply by 123 = 1728 ie 1 cu ft = 1728 cu inches.
1 cu foot = 1ft * 1 ft * 1 ft = 12 in * 12 in * 12 in = 1728 cubic inches. So 2592 cu inches = 2592/1728 = 1.5 cu ft