Tree Age Calculator

This basic tree age calculator can be used to estimate the age of living trees. Simply measure the circumference of the tree with a measuring tape, enter the tree's kind, and then click the "Compute" button to calculate the tree's age. Know what is meant by estimating age of a tree, how to work out the DBH and its formula, solved examples on finding estimating the age of a tree, etc.

Enter Circumference (inches)

Estimating the Age of a Tree

Calculating the age of a tree when you don't know when it was planted can be challenging. However, using an approximate technique based on the circumference of the tree's trunk, it is possible to determine the tree's age.

The International Society of Arboriculture (ISA) was the first to suggest this method, which depends on a simple formula that employs the tree diameter at breast height (DBH), which is the diameter of the tree at a height of 4.5 feet above the ground.


How to Work Out the DBH?

To begin, measure the circumference of the tree at a height of 4.5 feet above the ground with a measuring tape. Then multiply the result by 3.141592 to get the final result (Pi). The DBH of the tree is this.

DBH (inches) = CBH (inches) / Pi (inches), where Pi is the constant (3.141592).

Next, look up the growth factor for the tree species in the Tree Species & Growth Factors table.

The age of the tree can then be estimated by multiplying the growth factor by the DBH in inches.

DBH (inches) × Growth Factor = Estimated Age of Tree (years)


FAQs on Tree Age Calculator

1. How do we find out how old a tree is?

A tree's girth can be used to estimate its age because a tree's girth increases by 2.5cm every year. Simply take a measurement around the tree's trunk (girth) at a distance of roughly 1 metre from the ground. Make sure your measurements are accurate to the millimetre. Then double the girth by 2.5 to get a year's age.


2. What is an average tree?

The average height for the dataset was 87.6 feet, with a girth of 100.1 inches and a spread of 54.9 feet.


3. What is the cost of milling a tree?

A flat, hourly fee is the most stable or secure manner of pricing for the mill owner. Rates vary by region and range from $65 to $105 per hour, plus additional fees for travel, broken blades, and so on. When you charge by the hour, you're transferring all of the risks of daily productivity to the customer.


4. How is the size of a tree determined?

The size of the tree is determined by its height. The height of a tree is measured from the ground to the tip of its tallest leader on the uphill side of the tree. The best way to measure height is with forestry devices like a clinometer or relaskop.


5. How quickly do trees grow each year?

Near the equator, many species of trees can grow several metres every year. Many trees near the equator reach full maturity in ten to twenty years. On the other hand, trees in northern latitudes, grow much more slowly, frequently only a metre or two per year.