Board Feet Calculator
Calculate board feet from lumber dimensions and quantity.
Calculation example
Inputs: Thickness: 2 in, Width: 6 in, Length: 8 ft, Quantity: 1
Result: 8 board feet
A 2 by 6 board that is 8 ft long contains 8 board feet.
Formula
Board feet = thickness × width × length ÷ 12 × quantity.
How to use this calculator
Calculate board feet as thickness in inches multiplied by width in inches multiplied by length in feet, divided by 12, then multiply by quantity.
Before you calculate
Measure the project dimensions as accurately as practical and keep all measurements in compatible units. For material products, use the coverage, yield, density, or package size stated by the manufacturer or supplier rather than a generic assumption.
Choose the waste allowance based on the project shape, installation method, cutting requirements, and material characteristics. A simple rectangular estimate may need adjustment for openings, corners, slopes, joints, patterns, compaction, or other site conditions.
Understanding the result
The calculator provides a planning estimate based on the inputs shown above. It is not a substitute for project drawings, structural design, manufacturer instructions, or local requirements. Before ordering, compare the calculated quantity with the supplier's package sizes and ordering units.
Tips
- Use actual dimensions when pricing rough or surfaced lumber.
- Supplier pricing may use different grading and measurement conventions.
Frequently asked questions
What is a board foot?
It is a lumber volume unit based on thickness, width and length.
Should actual dimensions be used?
Use actual dimensions when known.
Related calculators
Use compatible units and verify estimates against project specifications, local requirements and manufacturer instructions.