Lumber Calculator
Calculate board feet for any lumber project. Enter dimensions and quantity to get total board feet and linear feet.
Lumber / Board Feet Calculator
Calculate board feet — the standard unit of measure for lumber in North America. One board foot equals a piece of wood 1 inch thick, 12 inches wide, and 1 foot long (144 cubic inches).
Formula
Board Feet = (Thickness × Width × Length) ÷ 12
All measurements: thickness in inches, width in inches, length in feet. Multiply by quantity for total.
Common Lumber Sizes
- 1×4 × 8' = 2.67 board feet
- 2×4 × 8' = 5.33 board feet
- 2×6 × 10' = 10 board feet
- 2×12 × 12' = 24 board feet
Frequently Asked Questions
What is a board foot?
A board foot is a unit of volume equal to 144 cubic inches, or a board 1" thick × 12" wide × 1' long.
Does this account for nominal vs actual lumber sizes?
No, this uses the dimensions you enter. Lumber sold as '2×4' is actually 1.5" × 3.5" — enter the actual dimensions for accurate calculations.