Board Foot Calculator
Calculate the board footage of a single piece of lumber from its thickness, width, and length.
Minimum: 0
Thickness of the board in inches
Minimum: 0
Width of the board in inches
Minimum: 0
Length of the board in feet
Results
Board Feet
8 BF
How to Use This Calculator
Enter your input values
Fill in all required input fields for the Board Foot Calculator. Follow the units and input format printed next to each field. Where a unit selector is available, choose the units that match your data.
Review your inputs
Double-check that all values are correct and match the units or format shown for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.
Read the results
The Board Foot Calculator computes the output in your browser and displays the results, with units clearly labeled, as soon as they are ready — no data sent to a server.
Explore parameter sensitivity
Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.
When to Use This Calculator
- •Use the Board Foot Calculator when you need accurate results quickly without the risk of manual computation errors or unit conversion mistakes.
- •Use it to verify calculations made by hand or in spreadsheets — an independent check can catch errors before they lead to costly decisions.
- •Use it to explore how changing input parameters affects the output — a quick way to develop intuition and identify the most influential variables.
- •Use it when collaborating with others to ensure everyone is working from the same numbers and applying the same assumptions.
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About Board Foot Calculator
The board foot is the standard volumetric unit for measuring and pricing lumber in North America. One board foot equals the volume of a board that is 1 inch thick, 12 inches wide, and 1 foot long -- or 144 cubic inches. This calculator provides a quick way to determine the board footage of any single piece of lumber by entering its three dimensions. Lumber yards, sawmills, and hardwood dealers price their stock by the board foot, so understanding this measurement is essential for budgeting any woodworking or construction project. The formula is simple: multiply thickness in inches by width in inches by length in feet, then divide by 12.
The Math Behind It
Formula Reference
Board Foot
BF = Thickness(in) x Width(in) x Length(ft) / 12
Variables: Thickness and width in inches, length in feet. 1 BF = 144 cubic inches.
Worked Examples
Example 1: Standard 1x12 board, 8 feet long
Thickness = 1 in, Width = 12 in, Length = 8 ft
The board contains 8 board feet.
Example 2: 2x6 board, 10 feet long
Thickness = 2 in, Width = 6 in, Length = 10 ft
The board contains 10 board feet.
Common Mistakes & Tips
- !Mixing up inches and feet -- thickness and width must be in inches, length in feet.
- !Using actual dimensions instead of nominal for dimensional lumber pricing.
- !Forgetting that lumber under 1 inch thick is still priced at 1 BF minimum per surface foot.
Related Concepts
Used in These Calculators
Calculators that build on or apply the concepts from this page:
Frequently Asked Questions
Is a board foot the same as a square foot?
No. A square foot measures area (length x width). A board foot measures volume (length x width x thickness). A 1-inch thick board that is 1 square foot in area equals exactly 1 board foot.
How do I convert board feet to cubic feet?
Divide board feet by 12. One board foot equals 1/12 of a cubic foot (144 cubic inches / 1,728 cubic inches per cubic foot).
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