The volume of a cube is calculated the same as the volume of a cuboid - length x width x height.
However, a cube has three identical dimensions, so the formula can be simplified by simply "cubing" any one of the dimensions (which means, multiplying any side by itself three times.)
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If you know the length of one edge simply cube that length. For example, a 3-inch cube = 3 cubed (27) so the volume is 27 cubic inches.
The volume of a cube is always the cube (third power) of the length of its side,
whether you're in math or somewhere else.
Any side length cubed. For example if a cube is 2 in by 2in by 2in then you would do 2 cubed, or 8 cubic inches