Lumber Calculator
Calculate board feet and lumber needed for your project.
Last updated: June 13, 2026
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How to Use This Calculator
- 1Enter board length, width, and thickness.
- 2Enter number of boards needed.
- 3Enter price per board foot.
- 4View total board feet and cost.
Formula Explanation
Board footage is a standard lumber measurement. One board foot equals a 1-inch thick, 12-inch wide, 12-inch long piece of wood.
Variables:
Worked Examples
10 boards, 2×6, 8ft long, $4/BF
- 1. BF per board = (2×6×8)/12 = 8
- 2. Total BF = 8 × 10 = 80
- 3. Cost = 80 × $4 = $320
Why Use This Calculator
- Calculate exact lumber needs.
- Budget accurately for projects.
- Compare lumber pricing.
- Avoid over-ordering.
Tips & Best Practices
- Nominal sizes are larger than actual. A 2×4 is actually 1.5"×3.5".
- Buy 10-15% extra for waste, defects, and miscuts.
- Hardwoods are priced per board foot; softwoods often by the linear foot.
- Kiln-dried lumber costs more but is more stable.
Common Mistakes to Avoid
❌ Using nominal dimensions instead of actual.
✅ For volume calculations, use actual dimensions (2×4 is really 1.5×3.5). For board feet pricing, nominal dimensions are standard.
❌ Not adding waste factor.
✅ Always add 10-15% for waste from cuts, defects, and mistakes.
Frequently Asked Questions
What is a board foot?
How much does lumber cost?
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<iframe src="https://redicalc.com/embed/construction/lumber-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Lumber Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.
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