Board Foot Calculator
Lumber yards price by the larger nominal size, even though the finished board is milled smaller. Switch to actual size to see real wood volume instead.
Add every board in your project. Enter actual thickness and width in inches for each line.
Same lumber, different yards. Compare total cost including any delivery fee.
Know the board feet you need but not how long to cut it? Solve for the length per piece.
Recent calculations
Everything runs in your browser — no measurements or prices are sent anywhere.
Board-Foot Calculator: Calculate Lumber Volume & Cost Instantly
Why Accurate Board Foot Calculations Matter
Whether you’re a professional carpenter, a weekend woodworker, or running a construction project, knowing exactly how much lumber you need in board feet prevents costly over-ordering or frustrating shortages.
A board foot is a standard unit of lumber volume: one board foot equals a piece of wood 1 inch thick, 12 inches wide, and 12 inches long (or any combination with the same volume).
How to Use the Board-Foot Calculator
Copy and embed the advanced tool below on your site:
HTML
<!-- Paste the full calculator code from previous response here -->Live Tool Features:
- Real-time calculations as you type
- Support for multiple pieces
- Optional waste factor (highly recommended for real projects)
- Total cost estimation
Understanding the Formula
Board Feet = (Thickness × Width × Length) ÷ 12
- Thickness & Width in inches
- Length in feet
- Multiply by the number of pieces
Visual Guide to Board Foot Measurement
Pro Tips for Lumber Shopping
- Always add a waste factor—10-15% is standard for most projects
- Check actual vs nominal sizes—A 2×4 is actually 1.5″ x 3.5″
- Factor in species & grade—Prices vary widely (pine vs walnut)
- Calculate for all parts—List every component separately, then sum
Real-world lumber measurement in action
Common Board Foot Examples
- One 2x4x8: 5.33 board feet
- One 1x6x10: 5 board feet
- Ten 2x6x12s: 120 board feet
Why Builders Love This Tool
- Prevents material waste
- Improves project budgeting
- Works great for decking, framing, furniture making, and more
Try the calculator above and let us know in the comments what you’re building!