Tree Age Calculator

The tree age calculator guides you on how to calculate the age of a tree to understand its ecological and economical benefits, as you can learn at the tree value calculator. Our tool also tells you how much a tree grows in diameter or circumference in the given time so that you can design your yard suitably.

We also try to answer some interesting questions like:

• Do trees die of old age?
• How to tell how old a tree is by counting its rings?

And, don't forget to check our tree growth factor chart to find the fast-growing trees in your neighborhood!

The formula for calculating a tree's age is

where:

• $\text{age}$ — The tree's age in years;
• $\text{gf}$ — The tree growth factor; and
• $\text{dbh}$ — The diameter at breast height in inches.

Follow these steps to find your tree's age using this formula:

1. Measure the circumference at breast height (cbh) of the tree trunk using a measuring tape at 4.5 feet (1.3 meters) above the ground.
2. Divide the circumference cbh by pi (≈3.14) to obtain its diameter at breast height ($\text{dbh}$).
3. Convert $\text{dbh}$ to inches.
4. Multiply the diameter in inches with the tree species' growth factor.

It's very simple: select the type of tree and input the tree's circumference or diameter. 😎✨

Suppose you want to know the age of your red maple with a circumference of 6 feet and 3 inches (= 2 feet in diameter). To determine your tree's age using our tool, you'd follow these steps:

1. Scroll down the tree species' drop-down list and select Red maple.

2. To calculate your tree's age from its circumference:

   • Choose the unit for circumference at breast height ($\text{cbh}$) from the drop-down list beside its input box. For your red maple, the unit is feet/inches. Then enter the circumference of 6 feet and 3 inches (if you are not familiar with this way to express length, visit the feet and inches calculator).

   • Enter the tree's circumference in the input box — $6$ in the box to the left of $\text{ft}$ and $3$ in the box to the left of $\text{in}$.

Ta-da! The calculator shows your tree's diameter at breast height ($\text{dbh}$) is $61\ \text{cm}$ (you can convert the length to obtain the diameter in feet or feet and inches) and its age $107\ \text{years}$! It's a centenarian!

If you want to tell the tree's age from its diameter:

• Choose the unit for diameter at breast height from the drop-down list beside its input box — feet ($\text{ft}$).
• Enter your tree's diameter in the input box — $2$.

Did you know that you can roughly estimate your tree's birthday using our date calculator! Just enter your tree's age in days and today's date in our tool, and you can obtain a date close to your tree's actual birthday.

You can use our tree growth factor not only to calculate your tree's age but also to learn which trees grow faster than your tree. The rule is: The smaller the tree growth factor, the faster the tree grows.

While you are here, check out our tree spacing calculator. It will help you determine the correct distance for planting different types of trees.