Tree Age Estimator: How Old Is That Tree?
Counting rings needs a felled tree, but girth gives a living estimate. This estimator divides circumference by a species growth rate.
What is the Tree Age Estimator?
A tree's girth grows year by year, so circumference gives a rough age if you know the species' growth pace. Enter circumference and species and this tool divides one by the other. This is a rough estimate only: soil, climate, and competition change real growth rates.
How to use it
- Enter your values in the fields provided.
- Click Estimate Tree Age.
- Read the result and adjust an input if you want a different outcome.
Worked example
An oak with a 190 cm circumference estimates to 100 years at 1.9 cm of growth per year.
How old is an oak with a 190 cm circumference?
At 1.9 cm of circumference growth per year, 190 divided by 1.9 gives an estimated age of 100 years.
Frequently asked questions
What do I enter to get a result?
Fill in every field with your own numbers or choices, then run the tool. Empty number fields count as zero, so check them before you trust the output.
Can I reuse this result elsewhere?
Yes. The result is calculated in your browser from the values you entered, so you can copy the numbers into your own notes or plan.