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Calculators / Construction / Board foot
Board foot calculator
Estimate lumber volume in board feet.
On this page
Total board feet80bd ft
Per board13.33bd ft
Calculator controls
How to calculate
Estimate lumber volume in board feet.
board feet = thickness(in) × width(in) × length(ft) ÷ 12 × quantity
Worked example
Thickness (in): 2; Width (in): 8; Length (ft): 10; Number of boards: 6.
Total board feet: 80 bd ft; Per board: 13.33 bd ft.
Assumptions and limits
Nominal and actual lumber dimensions differ. Use actual dimensions when physical volume matters and add a project-specific waste allowance.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate lumber volume in board feet. The result follows the displayed formula and keeps every adjustable assumption visible.
When this tool is useful
Use this tool to plan quantities or compare scenarios before making a purchase or technical decision.
Understanding your inputs
| Input | What to enter |
|---|---|
| Thickness (in) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Width (in) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Length (ft) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Number of boards | Enter a number of at least 1 and no more than 100000. |
Frequently asked questions
What can change the board foot result?
Nominal and actual lumber dimensions differ. Use actual dimensions when physical volume matters and add a project-specific waste allowance.
Should I round the inputs first?
No. Enter the best measurements available and round only the practical final quantity, such as full packs, boards, sheets, or components.