Tool
Lumber Calculator
Estimate board feet for lumber based on dimensions and quantity.
Construction Calculators
What this tool does
Estimate total board feet for lumber pieces using standard dimensional inputs. Useful for framing, decking, and rough material takeoffs.
How to use
- Enter lumber length in feet, width and thickness in inches, and the number of pieces.
- Review the estimated board feet output.
- Adjust quantity or dimensions to compare material options.
Examples
2x6 framing studs
Input: Length: 8 ft, Width: 6 in, Thickness: 2 in, Quantity: 10
Output: Estimated board feet: 80.00
Board feet = (8 × 6 × 2 × 10) ÷ 12 = 80 board feet.
Assumptions
- Board feet uses the standard formula: (length ft × width in × thickness in × quantity) ÷ 12.
- Results are estimates only and do not include waste, delivery, or local pricing.
- Enter consistent units: length in feet, width and thickness in inches.
Common use cases
- Estimate framing lumber for walls and decks
- Compare lumber packages from suppliers
- Prepare rough takeoffs for small renovation projects
FAQ
What is a board foot?
One board foot equals 144 cubic inches of lumber, commonly written as 1 ft × 1 ft × 1 in.
Does this account for waste?
No. Add 5–15% extra material on site for cuts, defects, and offcuts.
Can I use this for rough-cut lumber?
Yes, as long as you enter actual nominal or net dimensions consistently.
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Last reviewed: 2026-05-23