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A lumber board feet calculator estimates the wood volume of raw and finished lumber boards. Designed for woodworkers, lumber yards, and structural carpenters, this calculator uses nominal dimensions for billing logs.
How to Calculate Board Feet
Lumber volume calculations multiply thickness by width and length. Billing is based on nominal rough-sawn sizes under ALSC standards to account for planing shrinkage [1].
Board Feet Formulas
- Board Feet (Length in feet): BF = (T (in) × W (in) × L (ft)) ÷ (12) × Qty
- Board Feet (Length in inches): BF = (T (in) × W (in) × L (in)) ÷ (144) × Qty
- Metric Volume (m³): Volume (m³) = (T (mm)) ÷ (1000) × (W (mm)) ÷ (1000) × L (m) × Qty
Sources & References
- ALSC (American Lumber Standard Committee) PS 20 Wood Standards:ALSC (American Lumber Standard Committee) PS 20 Wood Standards Source Link
- NHLA (National Hardwood Lumber Association) Rules for the Measurement:NHLA (National Hardwood Lumber Association) Rules for the Measurement Source Link
- ASTM D245: Standard Practice for Establishing Structural Grades Source Link
- DOC PS 20: American Softwood Lumber Standard Source Link
- WWPA (Western Wood Products Association) Lumber Grading Manual:WWPA (Western Wood Products Association) Lumber Grading Manual Source Link
- SPIB (Southern Pine Inspection Bureau) Standard Grading Rules:SPIB (Southern Pine Inspection Bureau) Standard Grading Rules Source Link
- Forest Products Laboratory: Wood Handbook Source Link
- ISO 3179: Coniferous and broadleaved softwood lumber - sizes Source Link
- NELMA (Northeastern Lumber Manufacturers Association) Grading Rules:NELMA (Northeastern Lumber Manufacturers Association) Grading Rules Source Link
- AWC National Design Specification (NDS) Supplement: Design Values Source Link
Frequently Asked Questions (FAQ)
What is a board foot?
A board foot (BF) is a specialized unit of lumber volume in the US and Canada, representing the volume of a board that is 12 inches wide, 12 inches long, and 1 inch thick (144 cubic inches).
What is the formula for board feet?
Board feet is calculated as: Board Feet = (Thickness in inches × Width in inches × Length in feet) / 12. If length is in inches, divide the product by 144.
What is nominal vs actual lumber size?
Nominal size is the rough-sawn dimension before planning (e.g. 2x4). Actual size is the finished planed dimension (e.g. 1.5" × 3.5"). Board feet is always calculated using nominal dimensions.
Why is board feet calculated using nominal sizes?
Wood is measured and billed based on its rough-cut volume before it is kiln-dried and planed to finished commercial dimensions, transferring drying waste to the pricing standard.
How does moisture shrinkage affect lumber volume?
Green lumber contains high water content. As it dries to standard 15% or 19% moisture content levels, it shrinks in width and thickness by 3% to 5% under ALSC codes.
What is quarter-sawn lumber?
Quarter-sawn wood is cut at a 90-degree angle to the growth rings, creating straight grain lines that resist twisting, warping, and shrinkage better than flat-sawn lumber.
How many board feet are in a standard 2x4 that is 8 feet long?
Board Feet = (2" × 4" × 8') / 12 = 5.33 BF. A bundle of 100 boards contains 533.33 board feet of lumber volume.
How do you calculate lumber volume in metric cubic meters?
Calculate the actual physical dimensions in meters: Volume (m³) = Thickness (m) × Width (m) × Length (m). To convert BF to m³, multiply BF by 0.00236.
What is lumber check and shake?
A check is a longitudinal crack across growth rings caused by uneven drying. A shake is a separation between rings, both of which reduce structural grade rating capacity.
What is the NHLA standard for grading hardwood lumber?
The NHLA grades hardwoods (like oak or maple) based on the percentage of clear, defect-free wood cut yields, ranging from FAS (First and Seconds) to Common grades.