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I was taught just to use the easy formula; TWL, Thickness x width x length = board feet.

TWL works if everything was in feet…

I really had trouble teaching board feet to my wood working students. They had a hard time understanding that 1″ × 1″ × 144″ and 1″ × 12″ × 12″ were both board feet, even more so that any other combination that resulted in 144 cubic inches was board feet. Was something to see, though, when it sunk in.

Good description Jeff- pretty simple once you get it but some have a hard time with it.