Live in a universe where three dimensional space morphs into 1 dimensional space.
A cubic foot is a 3-dimensional measure of volume while inches are a 1-dimensional measure of distance. The two measure different things and, according to basic dimensional analysis, conversion from one to the other is not valid.
On the other hand, to change cubic feet to CUBIC inches, you need to multiply by 1728.
This is because 1 cubic ft = 1ft*1ft*1ft = 12in*12in*12in = 12*12*12 cubic in = 1728 cubic inches.
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multiply by 12x12x12
If you mean 50 inches by 40 inches by 77 inches, the volume would be 98.03 cubic feet. If you mean 50 feet by 40 feet by 77 feet, the volume would be 169400 cubic feet.
Well, first you would have to have the measurement in cubic inches. Divide the cubic inches by 1728 and the result is cubic feet. I would recommend looking up how to do conversions if you want to know how to do it yourself.
2.5 cubic feet = 4,320 cubic inches
16 cubic feet = 27,648 cubic inches