None.
A square foot is a measure of area in 2-dimensional space while a cubic foot is a measure of volume in 3-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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500 cubic feet
64 cubic feet
75 cubic feet
8*4*1.6 = 51.2 cubic feet
100*20*2 = 4000 cubic feet