Board feet is a measurement of the volume of lumber, often used by wholesalers and sawmills in Canada and the United States. A single board foot is equivalent to 1 square foot of lumber that is 1 inch thick, meaning it has a length of 12 inches, a width of 12 inches, and a thickness of 1 inch.Click to see full answer. Similarly one may ask, how do you calculate a board foot? By Definition A single board foot of lumber measures 1 inch thick, 12 inches wide and 12 inches long. The formula for calculating board feet is first to multiply thickness by width by length — in inches. Then divide the total by 144 for the total board footage of a given board.Also, how many board feet are in a 4×8 sheet of plywood? Divide by the total square footage by the square footage of a sheet of plywood to find the number of sheets required to cover the space. A 4×8 sheet of plywood is 32 ft2. Also to know is, how many board feet is a 2x4x8? Example 1: A 4/4 board 8 inches wide and 8 feet long has 5.33 bd. ft. = 5.33 bd. ft. How to Calculate Board Footage. Board Footage = width in inches x length in inches x thickness in inches 144 How many board feet are in a 2x8x16? Re: board feet per 2×4 An 8′-2×4 has 5.3 board feet. A 16′ 2×4 will have 10.6 board feet and a 14′-2×4 will have 9.3 board feet. multiply the height in inches times the width in inches times the length in feet and divide by 12. It’s easy to remember.