Select the tree species from the dropdown. Then enter the tree circumference. Finally select the unit of measurment.
To calculate the age of a tree manually, we need to multiply the trunk diameter at breast (DBH) by the growth factor for that tree species.
Step 1: Measure the trunk’s circumference at chest height and divide by Pi (3.14) to get the diameter.
Step 2: Then, you multiply the tree’s diameter by the tree species’ growth factor1
See the table for growth factors used in this calculator: