What's the difference between '15 square inches' and '15 inches squared'. I always thought there was a difference but now am being told that both are the same. If that's the case... Then how does 1 sq. inch = 1 in squared? Also.... Is 1 cubic foot the same as 1 foot cubed? Yes, that would seem to be the case. However...does this hold for other numbers as well? Do 2 cubic feet = 2 ft. cubed? Or is it that 2 cubic feet would be a cube that is 1.27 ft on each side, while 2 ft. cubed would be a cube that measures 2 ft. on each side?