You do not because there is no equivalence.
A foot is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.
20 ft * 12.6 ft = 252 sq ft = 23.41 sq metres
=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.
125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.
105,600 sq feet.