Board Foot Calculator
Calculate board feet for lumber and wood materials. Essential for construction projects, furniture making, and woodworking calculations.
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Lumber Dimensions
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What is a Board Foot?
A board foot is a unit of volume measurement used in the lumber industry. It represents the volume of a piece of wood that is 1 foot long, 1 foot wide, and 1 inch thick (or 144 cubic inches). This measurement is essential for pricing lumber and calculating material quantities.
Board foot calculations are crucial for construction projects, furniture making, and woodworking. Understanding board feet helps ensure accurate material ordering and cost estimation for wood-based projects.
Board Foot Formula
Formula
Board Feet = (Length × Width × Thickness) ÷ 144
Where all dimensions are in inches
Example Calculation
A board that is 8 feet long, 6 inches wide, and 1 inch thick:
- • Length: 8 ft × 12 = 96 inches
- • Width: 6 inches
- • Thickness: 1 inch
- • Board Feet = (96 × 6 × 1) ÷ 144 = 4 board feet
How to Use the Board Foot Calculator
Enter Dimensions
Input the length, width, and thickness of your lumber in your preferred units.
Set Quantity
Enter the number of pieces you need to calculate the total board feet.
Calculate Results
Click "Calculate Board Feet" to get your results and optional cost calculation.
Common Lumber Sizes
Here are some common lumber dimensions and their board foot equivalents:
Dimensional Lumber
- • 2×4×8 ft = 5.33 board feet
- • 2×6×8 ft = 8.00 board feet
- • 2×8×8 ft = 10.67 board feet
- • 2×10×8 ft = 13.33 board feet
Sheet Goods
- • 4×8×3/4" plywood = 2 board feet
- • 4×8×1/2" plywood = 1.33 board feet
- • 4×8×1/4" plywood = 0.67 board feet
- • 4×8×1" plywood = 2.67 board feet
Frequently Asked Questions
Why do lumber yards use board feet instead of cubic feet?
Board feet is a traditional unit that's easier to work with for lumber pricing and estimation. It's based on a 1-inch thickness, making it practical for most construction applications.
How do I convert board feet to cubic feet?
Divide board feet by 12 to get cubic feet. For example, 24 board feet ÷ 12 = 2 cubic feet.
What's the difference between nominal and actual lumber sizes?
Nominal size is the name (like "2×4"), while actual size is the real dimensions after drying and planing. A nominal 2×4 is actually 1.5" × 3.5".