Board Foot Calculator
Calculate the board footage of a piece of lumber, or a quantity of identical pieces.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter your lumber's thickness, width, and length to find its board footage.
Your result
8
Board feet per piece
Total board feet8
AI explanation
Formula
Board feet per piece = (thickness × width × length) ÷ 12Worked example
1 piece, 2in × 6in × 8ft
| Field | Value |
|---|---|
| Thickness (inches) | 2 |
| Width (inches) | 6 |
| Length (feet) | 8 |
| Number of pieces | 1 |
| Price per board foot (optional) | 0 |
| Board feet per piece | 8 |
| Total board feet | 8 |
Assumptions
- A board foot is a lumber volume unit — 1 inch thick × 1 foot wide × 1 foot long (144 cubic inches).
Frequently asked questions
What is a board foot?
A volume measurement for lumber — 1 inch thick, 1 foot wide, and 1 foot long (144 cubic inches).
I also want the total cost — is there a version with that?
Yes — see the Lumber Calculator, which includes a price-per-board-foot field and shows the total cost.
How do I compute board feet for an odd-shaped piece?
This formula assumes a rectangular cross-section — for irregular shapes, estimate an average width or calculate volume directly and convert (1 board foot = 144 cubic inches).