Calculate the board feet of lumber by multiplying the length, thickness and width in inches and dividing the result by 144. An online board feet calculator is available on HardwoodStore.com, as of 2015.
Board feet of lumber can also be calculated by multiplying the thickness in inches, the width in inches and the length in feet and then dividing the result by 12.
Find the online board feet calculator on HardwoodStore.com by clicking How to Calculate Board Footage on the left side of the page. The page prompts to select a board thickness, enter a length and width and then click Calculate. The calculator allows visitors to enter the length in feet or inches.