Wood Board Feet Calculator – Calculate Lumber Board Footage Instantly
Price and plan your woodworking projects accurately with our Wood Board Feet Calculator. Enter the thickness, width, and length of each board to calculate total board feet — the standard unit for buying and selling lumber.
Results
Add boards and click Calculate to see results
Understanding Board Feet
A board foot is a unit of volume used in the lumber industry, equal to a board 1 inch thick, 12 inches wide, and 12 inches long (144 cubic inches).
- Formula: (Thickness" × Width" × Length') / 144 = Board Feet
- Note: Nominal dimensions (e.g., 2×4) differ from actual dimensions (e.g., 1.5" × 3.5"). Use actual dimensions for accurate calculations.
- Common thicknesses: 4/4 (1"), 5/4 (1.25"), 8/4 (2"), 12/4 (3")
Tip: Always add 10-20% extra for waste, cuts, and defects when ordering lumber.
How to Calculate Board Feet
Add Board Dimensions
Enter thickness, width, and length for each board. Add multiple boards as needed.
Select Wood Type
Choose from common lumber species to get cost estimates per board foot.
Get Total & Cost
See total board feet and estimated cost for your lumber order.
Key Features of This Board Feet Calculator
**Multiple Board Support**
Add and calculate board feet for multiple pieces of different sizes.
**Wood Type Database**
15+ common wood species with current pricing for cost estimates.
**Flexible Units**
Enter dimensions in inches or feet with automatic conversion.
**Detailed Breakdown**
See board feet and cost for each piece plus totals.
Frequently Asked Questions
What is a board foot?
A board foot is a volume measurement for lumber equal to 144 cubic inches (12" × 12" × 1"). It's the standard unit for buying and selling hardwood lumber.
How do you calculate board feet?
Board Feet = (Thickness" × Width" × Length') / 12. For example, a 2" × 6" × 8' board = (2 × 6 × 8) / 12 = 8 board feet.
Why is lumber sold by board foot?
Board feet measures volume, not just length. This accounts for thickness and width variations, ensuring fair pricing for different lumber dimensions.
What's the difference between hardwood and softwood?
Hardwoods (oak, maple, walnut) come from deciduous trees and are typically harder. Softwoods (pine, fir, cedar) come from conifers. Hardwoods are usually sold by board foot; softwoods by linear foot.
How much waste should I add?
Add 10-15% for simple projects, 20%+ for complex cuts or figured wood. This accounts for cutting waste, defects, and grain matching.
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