Lumber Calculator (Board Feet)
Calculate board feet and estimate costs for your lumber purchases.
Lumber Calculator (Board Feet)
Calculate board feet and cost for lumber purchases
Formula
Board Feet = (Thickness × Width × Length) ÷ 12Uses nominal dimensions; actual dimensions shown in results
How to Use This Calculator
- 1
Enter dimensions
Enter the nominal thickness, width, and length of your lumber.
- 2
Set quantity
Enter how many pieces you need.
- 3
Add price
Enter price per board foot to calculate total cost.
Frequently Asked Questions
What is a board foot?
A board foot is 144 cubic inches of wood, or a piece 1" thick × 12" wide × 12" long.
What is nominal vs actual lumber size?
Nominal is the name (2×4), actual is the real size (1.5" × 3.5"). Lumber shrinks when dried.
How do I calculate board feet?
Board Feet = (Thickness × Width × Length) ÷ 12, where thickness and width are in inches, length in feet.