Enter the DBH and the PRF into the calculator to determine the limiting distance for the tree line.

Limiting Distance Formula

The following equation is used to calculate the Limiting Distance.

  • Where LD is the limiting distance (ft)
  • DBH is the diameter at the breast height of the tree (in)
  • PRF is the plot radius factor (ft/in)

To calculate the limiting distance, multiply the diameter at breast height by the plot radius factor.

How to Calculate Limiting Distance?

Example Problem:

The following example outlines the steps and information needed to calculate Limiting Distance.

First, determine the diameter of the tree at breast height. In this example, the diameter of the tree at breast height is 12.5 inches.

Next, determine the PRF. The PRF for this example, the PRF is 2.5inches/ft.

Finally, calculate the limiting distance using the formula above:


LD = 12.5*2.5

LD = 31.25 ft