The volume of bark on a tree varies by species and along the tree's length. It is almost impossible to calculate exact values. However, Dobie and Wright's formula can estimate the average bark volume.

This formula will estimate the average bark volume as a percentage of the total and wood volumes.

Estimating Void Areas

Not all bark is the same. You will have to estimate the void area percentage of the bark.

Diameter measurements can be entered in inches, centimetres, or millimetres.
The units used for the inside and outside diameter measurements must be the same.

Calculator

1. enter the outside diameter of the bark measurement
2. the inside bark diameter measurement
3. the estimated amount of voids in the bark in a percentage

Results

1. percentage of bark volume of the total volume
2. percentage of bark volume of the total volume minus voids
3. bark as a percentage of wood volume
4. bark as a percentage of wood volume minus voids