**How To Calculate Board Feet**. Width in inches x length in feet x thickness in inches 12 Board feet The last practical way to measure board feet is by finding the square footage and then multiplying that by the thickness. Finally divide the volume by 12 to calculate board feet.

Surprisingly the calculations are extremely easy. Just remember that one board foot is equal to a volume of one square foot thats an inch thick. Then measure the length of the log in feet.

### This formula will be the foundation for creating the scales on our lumber rule.

Where the two measurements intersect is the approximate board foot output. Enter the diameter in inches of the small end of the log inside the bark if you have a log otherwise the diameter at breast height 45 off the ground if the tree is standing. Where the two measurements intersect is the approximate board foot output. Width x Height Square Feet Determine cured foam thickness in inches to.