Board Foot Calculator
Enter thickness, width, and length to get board feet of lumber.
Measure lumber in board feet
Hardwood lumber is bought by the board foot, a volume unit rather than a length, so estimating a project means converting your board sizes. This calculator does that from thickness, width, and length.
A one-inch board, 6 inches wide and 8 feet long, is 4 board feet. Enter a quantity and the tool multiplies out the project total, which is what a lumber yard will price against.
Exact and private
It uses the standard board-foot formula with length in feet, and computes everything in your browser with nothing uploaded.
Frequently Asked Questions
What is a board foot?
A unit of lumber volume equal to a board 1 inch thick, 12 inches wide, and 1 foot long — 144 cubic inches. Hardwood is priced by the board foot.
What is the formula?
Board feet = thickness (in) × width (in) × length (in) ÷ 144, or use length in feet and divide by 12.
How does quantity work?
Enter how many identical boards you have and the tool multiplies the per-board figure for a project total.
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