Calculate how much lumber volume a project requires, allow for whole extra boards, and estimate the purchase price.
Board feet = thickness (inches) × width (inches) × length (feet) ÷ 12. The total is multiplied by the quantity of boards, then extra whole boards are added to the purchase estimate.
Learn about the underlying method: Penn State Extension, board feet ↗
Note: This tool estimates quantities, not structural requirements, installation safety, code compliance, or product suitability.
A board foot is 144 cubic inches of wood: 12 inches by 12 inches by 1 inch.
Use the dimension convention that your specific supplier uses for volume and pricing. A nominal 2 × 4 can differ from its actual planed dimensions.
Only when your vendor prices by board foot. Many construction boards are priced per piece or by length.