Board Foot Calculator
Board feet express lumber volume as a trade unit. This calculator computes volume from thickness and width in inches and length in feet, then scales it by piece count.
How to use this calculator
- Enter the dimensions used by your quote and the number of pieces.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by board foot calculator calculator
Board feet per piece = thickness(in) × width(in) × length(ft) ÷ 12.
- Board feet per piece = thickness(in) × width(in) × length(ft) ÷ 12.
- Suppliers may charge using nominal or actual surfaced dimensions; confirm the convention before ordering.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
A nominal 1.5 × 7.25 inch board 8 ft long is 7.25 board feet.
1.5 × 7.25 × 8 ÷ 12 = 7.25 board feet per piece.
The calculator returns volume for one piece and the full quantity.
Understanding the result
Board feet express lumber volume as a trade unit. This calculator computes volume from thickness and width in inches and length in feet, then scales it by piece count.
Suppliers may charge using nominal or actual surfaced dimensions; confirm the convention before ordering.
Important notes
Suppliers may charge using nominal or actual surfaced dimensions; confirm the convention before ordering.
Treat the result as an estimate from the entered assumptions. For safety, legal, engineering, health or commercial decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Why divide by 12?
One board foot is a volume of 144 cubic inches; length is entered in feet, so the formula simplifies to dividing the inch dimensions multiplied by feet by 12.
Does board foot equal linear foot?
No. Board feet measure volume; linear feet measure length only.
How should I interpret this result?
Suppliers may charge using nominal or actual surfaced dimensions; confirm the convention before ordering.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.