Because my Dad and Grandpa Fischer from Austria were carpenters, I often heard the expression, “board foot.” Years ago, lumber used in building houses was bought by the board foot.
The number, 12, is key. A foot measure is 12 linear inches. A board foot is 12 cubic inches. For example, a board 1”x 12” and 1” thick is one board foot.
A regular 2”x 4” stud, used in building a house, is eight feet (96”) long and contains 768 cubic inches or 64 board feet (768/12).
A board foot is equal in volume to a square foot of lumber 1" thick.
A square foot of lumber/flooring, etc. would be 12" x 12" (or similar dimensions totaling 144 square inches), but could be of any thickness.
If you know the thickness, you could calculate the board footage from the square footage. Flooring may be sold by the square foot, since that is the measurement you are likely to take when you are calculating the size of the area to be covered, so it's a convenient unit of measure for floor coverings.
Visit the lumber calculator at www.woodweb.com/Resources/RSCalculators.html
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