Tree Age Estimate Calculator

Choose a type of tree from the dropdown menu. Next, input the circumference of the tree. Then, select the measurement unit.

Tree Type:

Enter tree circumference:

Unit:

Estimated Tree Age: 0 years

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:

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