How To Figure Box Volume

Cubic feet is measured by multiplying the height X width X depth of the inside dimensions of the box, and dividing that total by the number of cubic inches in a cubic foot (a cubic foot is 12 X 12 X 12= 1728).

For example, a box with outside measurements of 16 inches high, by 34 inches wide, by 14 inches deep would be figured as so; first we subtract the wood thickness. This is usually ¾” thick, times the thickness of both sides of the box= 1 ½ inches. We subtract this from the outside dimensions.

So now we have
14.5H X 32.5W X 12.5D=5890.625.

5890.625 divided by 1728 = 3.4 cubic feet.

You can keep changing dimensions and refiguring the box volume, until you come up with the ideal box size and shape for your application.