When to use this calculator
Calculate lumber volume in board feet from dimensions in inches and feet. Use actual dimensions or the measurement convention required by your supplier.
Explore the material quantities calculators for other questions in this topic. For a related calculation, use the Brick Quantity Calculator: Estimate bricks for a net wall area using your brick-and-joint face dimensions.
PUTTING IT INTO PRACTICE
Board Feet: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Thickness (inches) | 2 |
| Width (inches) | 6 |
| Length (feet) | 8 |
| Number of boards (integer) | 10 |
| Result | 80 board feet |
- Check the input labels and enter the example values above.
- Apply the relationship: Board feet = thickness(in) × width(in) × length(ft) × count ÷ 12.
- The result is 80 board feet, rounded for display.
How to interpret your result
Use actual dimensions or the measurement convention required by your supplier.
Calculate net geometric quantities first, then apply a project-specific allowance where appropriate. Coverage per bag or pack should come from the product label. Bulk density, trimming and compaction can substantially change order quantities.
Frequently asked questions
Does a geometric estimate include waste automatically?
Only when a waste or allowance input is provided. Otherwise add an appropriate allowance separately before ordering.
How do I use the board feet calculator?
Enter thickness (inches), width (inches), length (feet), number of boards (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Board feet = thickness(in) × width(in) × length(ft) × count ÷ 12.
What should I check before using the result?
Use actual dimensions or the measurement convention required by your supplier.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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