Your question is very confused. The cubit is a unit of measurement that has nothing to do with inches or feet. Possibly you intended to ask how many cubic inches are in a cubic foot, the answer being 1728.
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1 cubic foot = 12 x 12 x 12 = 1728 cubic inches 3456 cubic inches = 3456/1728 = 2 cubic feet
One Forearm = 1 Cubit = 18 inches
1 foot = 12 inches
12 inches = 1 foot
1 foot = 12 inches