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.
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.