WOODWORKING QUICK GUIDE · UNITED STATES
How to calculate board feet
For nominal lumber dimensions in inches and length in feet:
The formula
Thickness × width × length × quantity ÷ 12
Example: four 1 × 8 boards, each 10 ft long, total 26.667 board feet.
Calculate up to three lumber lines
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Scope
This is a nominal-dimension volume tally. It does not calculate price, waste, yield, surfaced dimensions, structural suitability, or safety.