Lumber Board-Foot Calculator
Calculate board feet, waste-adjusted piece count, total linear length, wood volume and lumber cost.
Default project preview
132 board ft
Board feet each
12
Base board feet
120
Boards to buy
11
Total linear length
132 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Nominal thickness
Enter this project assumption in in. The current imperial default is 2 in.
Nominal width
Enter this project assumption in in. The current imperial default is 6 in.
Board length
Enter this project assumption in ft. The current imperial default is 12 ft.
Board quantity
Enter this project assumption in a unitless value. The current imperial default is 10. Minimum: 1.
Waste allowance
Enter this project assumption in %. The current imperial default is 10 %. Minimum: 0. Maximum: 50.
Price per board foot
Enter this project assumption in a unitless value. The current imperial default is 3.25. Minimum: 0.
How to read the outputs
Board feet each
per entered board. Default preview: 12.
Base board feet
10 boards before waste. Default preview: 120.
Boards to buy
rounded whole pieces. Default preview: 11.
Total linear length
all ordered boards. Default preview: 132 ft.
Wood volume
geometric volume. Default preview: 0.311 m³.
Estimated cost
using price per board foot. Default preview: $429.00.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Board feet per piece = thickness (in) × width (in) × length (ft) ÷ 12. Order pieces = round up (quantity × waste factor). Cost = order board feet × price per board foot.
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: August 19, 2026
Calculate lumber volume in board feet from nominal thickness, width and length, then apply waste by whole-board count and estimate cost per board foot.
Calculation steps
- 1Enter the dimensions used by the supplier for board-foot pricing.
- 2Calculate board feet per piece as thickness × width × length ÷ 12 in imperial units.
- 3Apply waste to piece count and round up to whole boards.
- 4Multiply the resulting order board feet by the quoted price per board foot.
Worked numerical example
Ten nominal 2×6 boards at 12 ft contain 12 board feet each, or 120 board feet total. A 10% piece allowance rounds the order to 11 boards, producing 132 board feet at the supplier’s board-foot pricing basis.
Purchasing and rounding
Confirm whether the lumberyard prices rough/nominal or surfaced/actual dimensions, plus species, grade, moisture condition and available lengths. Those choices affect both volume and price.
Interpret the result
Board foot is a volume measure, not linear footage. The calculator intentionally rounds the waste allowance to full boards before computing the final purchasable board-foot quantity.
Page-specific assumptions
- Pricing dimensions follow the supplier convention.
- All boards in the scenario share dimensions.
- Waste is represented by additional whole pieces.
Common mistakes
- Using actual dressed dimensions when the quote uses nominal dimensions.
- Confusing board feet with square feet.
- Applying percentage waste to cost without buying extra whole boards.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Lumber Board-Foot Calculator questions
What is one board foot?+
One board foot is a volume equal to a board 1 inch thick, 12 inches wide and 12 inches long.
Should nominal or actual lumber dimensions be used?+
Board-foot pricing commonly uses nominal dimensions, but supplier practices vary. Match the dimensions used on the quote.
Why is waste rounded by complete boards?+
Lumber is purchased as full pieces, so the calculator rounds the waste-adjusted quantity upward before calculating the final order.