Enter the tree’s diameter at breast height (DBH)
Select the tree species
Click “Calculate” to get the estimated age

What Is a Tree Age Calculator?

A tree age calculator is a tool that estimates the age of a tree using various methods—most commonly by measuring its trunk diameter, analyzing growth rings, or even using a photo-based estimation in modern tools. Whether you're a botanist, homeowner, landscaper, or curious nature lover, knowing the age of a tree can help with conservation, care, and planning.

Our tree age calculator is designed to be user-friendly and educational, combining scientific formulas and species-specific data to provide accurate estimates. It supports popular species like oak, maple, cedar, and live oak, and can be used directly in your browser.

How to Use the Tree Age Calculator

1. Measure the tree’s diameter at 4.5 feet (1.37 meters) above the ground. This is known as DBH (Diameter at Breast Height).
2. Select the tree species from the dropdown list.
3. Click "Calculate" — the tool will multiply the diameter by the species’ growth factor to estimate the tree's age.

You can use this calculator for general estimations or supplement it with growth rings if you’re cutting cross-sections or using photo analysis apps.

Why Use a Tree Age Calculator?

• Non-invasive: No need to cut the tree.
• Fast: Get results in seconds.
• Customizable: Supports specific trees like the live oak, maple, cedar, and oak.
• Accessible: Works on all devices, no need to download a tree age calculator app.

Whether you're estimating tree age by diameter, checking a tree age chart, or using a tree age calculator by photo, this tool empowers your ecological insight.

Frequently Asked Questions (FAQs)

How accurate is the tree age calculator?

The calculator provides a reliable estimate based on average growth factors for each species. For precise age, count growth rings.

Can I use this calculator for any tree?

Yes, but results are most accurate for oak, maple, cedar, and live oak trees.

What is the formula for estimating tree age?

Tree Age = Diameter × Growth Factor (species-specific).

Is there a mobile tree age calculator app?

Yes, there are several. But this tool works smoothly online and provides instant results.

How do I find tree age by rings?

You can count the rings on a cross-section or stump. Each ring represents one year.