An inch is a unit of length. A cubic foot is a unit of capacity. The two units are therefore incompatible.
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If you meant cu. in to cu. ft.divide by 1728.
You can convert from feet to inches, or from cubic feet to cubic inches, but you can't convert from cubic feet to inches.
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.
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