LUMBER VOLUME
How to Calculate Board Feet
A board foot is a volume equal to a board 12 inches by 12 inches by 1 inch.
SHORT ANSWER
Start with the inputs you can verify
A board foot is a volume equal to a board 12 inches by 12 inches by 1 inch.
What the estimate means
For dimensions in inches, multiply thickness by width by length and divide by 144.
Rough and surfaced dimensions can differ, so use the dimensions required by the seller or plan.
Where estimates go wrong
Board-foot estimates do not automatically include defects, matching, milling loss, or project waste.
Keep the source measurements and assumptions with the result so another person can review or update the estimate later.
A practical workflow
- Record thickness, width, and length consistently.
- Calculate volume for each board and total the results.
- Add a separate allowance for defects, milling, and selection.