There can be no conversion. An inch is a measure of length in 1-dimensional space while a cubic inch is a measure of volume in 3-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempts at comparisons or conversions between the two are fundamentally flawed.
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3 × 2.5 × 2 = 15 cubic inches (length x width x depth = cubic measurement).
Therefore, total inches is 3 + 2.5 + 2 = 7.5 inches (7 1/2 inches).
15 cubic inches = 0.00868 cubic feet.
18" x 8" x 15" = 2,160 cubic inches = 1.25 cubic feet
1 cubic foot = 1,728 cubic inchesVolume = 10 x 12 x 15 = 1,800 cubic inches = 1.04167 cubic feet (rounded)
15*15*15 = 3375 cubic inches.
A chalkboard has a volume that would be 15 cubic inches.