Measure the board’s thickness in inches
Measure the board’s width in inches
Measure the board’s length in feet
Multiply thickness × width × length
Divide the result by 12
Use this formula: board feet = (thickness × width × length) ÷ 12
For a 1-inch-thick board, use: board feet = width × length ÷ 12
For multiple boards, calculate each board foot amount and add them together