One board foot is defined as a piece of lumber that contains of wood. A standard visual for this is a board that is: 1 inch thick 12 inches wide 1 foot (12 inches) long How to Calculate Board Feet
Multiply thickness (in) × width (in) × length (), then divide by 12.
Depending on which units you have measured, use one of these two formulas: Formula 1 (Mixed Units) Formula 2 (All Inches) (T" × W" × L") ÷ 144