Tree Age Calculator
Result
Tree Age Calculator — free online calculator.
Formula
- Estimate tree age from trunk diameter and an explicit species/site growth factor. The growth factor must be chosen from an appropriate forestry reference for the tree and growing conditions.
- Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Tree Age
A 12-inch trunk diameter with a chosen growth factor of 4 gives an estimated age of 48 years.
Sample result: Calculating…
Frequently asked questions
What does the Tree Age calculate?
Growth factors are empirical and species/site dependent. This estimate is not a substitute for ring counting or professional dendrochronology.
Which values should I enter?
Enter the values requested by the calculator using the labels and units shown on the page.
What formula does this calculator use?
The calculator uses the following relationship: Estimated age = trunk diameter × growth factor.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.