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Because most people had feet and forearms, that they could measure things with.
You cannot convert feet, which is a measure of distance into square feet, which is a measure of area. The two measure different things and it makes no sense to try to convert from one to the other.
It is: 6*6*6 = 216 cubic feet
They are two different things. A square foot is a measure of area. A linear foot is a measure of length or distance.