5.4 x 12 inches x 12 inches x12 inches = 9331.2 cubic inches
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Infinity. "Inches" are a unit of measure in one dimension. "Cubic inches" are a unit of measure in three dimensions. The two units of measure cannot be directly converted to one another.
One cubic foot is 12^3 = 1728 cubic inches.
4.5 cubic feet * 1728 = 7776 cubic inches.