There's no direct comparison between inches and cubic feet, because they're
units of different things. "Inches" is a measurement of length. "Cubic feet" is
a measurement of volume or capacity.
But if you'd like to discuss 'cubic inches', there are 1,728 of those in 1 cubic foot,
and 31,104 of them in 18 cubic feet.
But if "inches" are what you really mean, then you can only compare those to 'feet',
not to 'cubic feet. There are 12 inches in 1 foot, and 216 inches in 18 feet.
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