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How to Calculate Board Footage for Lumber: A Simple Guide
If you’re working on a woodworking project, managing a lumber inventory, or purchasing wood for construction, understanding how to calculate board footage is essential. Board footage is a volume measurement used primarily in North America to quantify lumber. It helps ensure you get the right amount of wood for your needs. Here’s a straightforward guide to help you calculate board footage accurately.
What is a Board Foot?
A board foot is a unit of measurement for lumber that is equal to a 1-inch thick, 12-inch wide, and 12-inch-long piece of wood. In other words, one board foot equals 144 cubic inches of wood.
The Formula for Calculating Board Footage
To calculate the board footage of a piece of lumber, you can use the following formula:
Board Feet (BF) = Thickness (in inches) x Width (in inches) x Length (in feet) – Divided by 12
This formula converts the cubic inches into board feet by dividing by 12.
Step-by-Step Calculation
Step 1: Measure the Dimensions
First, measure the thickness, width, and length of the lumber piece. Ensure that:
- Thickness is in inches.
- Width is in inches.
- Length is in feet.
Example:
- Thickness = 2 inches
- Width = 8 inches
- Length = 10 feet
Step 2: Apply the Formula
Now, plug the measurements into the formula:
Board Feet (BF) = 2” x 8” x 10 FT – Divided by 12
Step 3: Perform the Calculation
- Multiply the thickness, width, and length: 2×8×10 = 160
- Divide the result by 12 to convert cubic inches to board feet: 160 divided by 12 = 13.33
So, the piece of lumber in this example is 13.33 board feet.
Additional Tips
- Consistency in Units: Always ensure thickness and width are in inches and length is in feet when using the formula.
- Buying Lumber: When purchasing lumber, knowing the board footage helps you compare prices accurately and buy the right amount.
- Waste Factor: Consider adding a waste factor (typically 40%) to your calculations to account for any mistakes or unusable wood.
Conclusion
Calculating board footage is a crucial skill for anyone working with lumber. By following the simple formula and steps outlined above, you can ensure you have the correct amount of wood for your project, saving you time and money. Remember to measure accurately, use consistent units, and account for waste to get the best results.
Happy woodworking