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Lumber Calculator

This board foot calculator allows you to quickly estimate the volume of hardwood lumber you want to buy. If you're unsure how to calculate board feet or what a board foot is, scroll down for more in-depth information. Otherwise, simply type the dimensions of a wood piece into this board foot calculator!

What is a board foot?

Unlike square footage, the board footage measures volume. You use it when purchasing multiple boards of lumber in various sizes.

By definition, one board foot of lumber is one square foot that is one-inch thick. If you would like to convert regular volume units into board feet, use the following relation:

  • 1 board foot = 144 cubic inches = 1/12 cubic foot

How to calculate board feet?

Surprisingly, the calculations are extremely easy! All you need to do is use the board foot formula below:

  • board feet = length(ft) × width(in) × thickness(in) / 12


Pay special attention to the units! The length of the wooden board should be expressed in feet, while the width and thickness – in inches.

Using the lumber calculator: an example

Let's assume you want to use this board foot calculator to determine how much you should pay for a few hardwood pieces.

Decide on the number of pieces you want to purchase. Let's assume it's five wooden boards.

Choose the dimensions of the boards. For example, a piece of hardwood can be 8 feet long, 10 inches wide, and 1.25 inches thick.

Substitute these numbers into the board foot formula to find the board footage per piece:

  • board feet = length(ft) × width(in) × thickness(in) / 12

  • board feet = 8 × 10 × 1.25 / 12

  • board feet = 8.33 BF

Now, multiply this result by the number of pieces to obtain the total board footage of your purchase:

  • 5 × 8.33 = 41.67 BF


Finally, you can multiply this value by the price per board foot to determine the total cost of your purchase. Assuming one board foot of lumber costs $4.15, then:

  • cost = 41.67 × $4.15 = $172.92


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