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.
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You can't convert a measurement of area (square) into a measurement of volume (cubic). I'm going to assume you meant 196 cubic feet, which would be 338688 cubic inches.
You can convert from feet to inches, or from cubic feet to cubic inches, but you can't convert from cubic feet to inches.
4 cubic feet - 6,912 cubic inches
You can't convert cubic feet into inches.But you can convert cubic feet into cubicinches.5.3 cubic feet is the same volume as 9,158.4 cubic inches.
Two solutions: Solution 1: Convert 78.5 square feet to square inches: 78.5 * 12 * 12 = 11,304 square inches Now multiply that by your height: 11,304 * 2 = 22,608 cubic inches Now divide that by 1,728 cubic inches (which is a cubic foot): 22,608 / 1728 = 13.083 cubic feet (13 feet, 1 inch) Solution 2: Convert your height to feet: 2 / 12 = 0.167 feet Now multiply that by 78.5: 0.167 * 78.5 = 13.083 cubic feet (13 feet, 1 inch)