One board foot is the nominal quantity of lumber derived from a piece of rough green lumber 1 inch thick and 1 foot wide by 1 foot long. In other words a board foot is the nominal thickness times the nominal depth in inches divided by 12 time the length in feet. For example a 10 foot 2 x 6 would work out to be 10 board feet. The formula is as follows: Thickness (in inches) x Depth (in inches) x Length (in feet) / 12 A linear foot is the quantity of lumber derived from the total length of a piece of lumber. For example, a 2"x4'x8' stud contains 8 linear feet.
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