Board feet and square feet are not the same thing at all. Board feet is a measurement of volume; it encompasses length, width and height (thickness). Square feet is a measurement of area, or surface; it encompasses only length and width. Knowing how to convert board feet to square feet is important when you are building with wood or any material that has a length, width and thickness.
Measure the width (W) and thickness (T) of the the board in inches.
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Measure the length (L) of the board in inches and divide it by 12.
Solve the following equation to calculate board feet: (W x T) x (L ÷ 12) = board feet.
Divide the number of board feet by the thickness of the board. This will give you the square footage of the board.