Board Foot Calculator
Estimate dimensional lumber volume across multiple board sizes. Switch between US customary and metric units, adjust the assumptions, and keep every step visible.
A visible formula, not a black box.
Inputs are converted to a common base unit before calculation. Purchase quantities are rounded only at the final buying boundary.
Example: ten 1 × 6 × 8 ft boards
The sample contains 40 board ft before allowance and 44 board ft after 10%; confirm nominal-versus-actual pricing.
Use this to understand the workflow—not as a recommendation for your project.What supports this calculation.
Check the job, not just the number.
- 01Leaving the example board feet inputs unchanged instead of entering measured project values.
- 02Treating an editable coverage, size, density, or allowance as universal instead of checking the selected product label, project documents, and local requirements.
- 03Ordering from the rounded result without reviewing exclusions: Use actual or nominal dimensions consistently with the supplier’s pricing method. One board foot equals 144 cubic inches.
Board feet FAQ
What does the Board Foot Calculator estimate?
Estimate dimensional lumber volume across multiple board sizes. The primary output is board feet, with the intermediate assumptions kept visible.
How is the board feet result calculated?
The visible formula is: board feet = thickness (in) × width (in) × length (ft) ÷ 12 × quantity. Inputs are converted to a common base unit before the final purchase boundary is rounded.
Are the default values recommendations?
No. Dimensions are worked examples and product-dependent presets are planning defaults. Replace them with the selected product label, project documents, and local requirements.
Is the result ready to order from?
Use it as a checked planning estimate, then confirm packaging, minimum orders, installation instructions, site conditions, and any code or professional-design requirements.