To be exact, for hardwood, the board footage is defined as BF = SM x T, where T is the nominal thickness in inches and SM = L x W / 12, where L is nominal length in feet, truncated (rounded down) to the nearest foot, W is actual width in inches, and SM is rounded to the nearest whole number.
For softwood, BF = L x W x T / 12, where L is nominal length in feet, truncated to the nearest even foot, W is nominal length in inches, T is nominal thickness in inches, and the result is rounded to the nearest 1/100 of a board foot.
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