Free tool
Tree age calculator
By Umair Nawaz, founder of Lirevon Updated How we test tools
How old is that tree? Measure around the trunk 4.5 feet up, pick the species and get a rough age in seconds. The growth factor is shown and you can change it. Useful for homeowners and for tree crews answering the "how old is it?" question on site.
Learn the terms: diameter at breast height (DBH). Browse tree species, tree pests and diseases and short answers, or see tree care by state.
1. The tree
2. The trunk
Age estimate
Your tree
Estimated age (rough)
–
Trunk diameter
–
Circumference
–
Growth factor
–
Roughly planted
–
Estimate only, from a rule-of-thumb growth factor. Real age can be decades more or less. Only a ring count or core sample gives a close age.
How the math works
- Measure the distance around the trunk 4.5 feet above the ground. If you used centimeters, the tool divides by 2.54 to get inches.
- Diameter = circumference ÷ pi (3.1416). If you measured the diameter, this step is skipped.
- Estimated age = diameter in inches × the species growth factor.
- Roughly planted = this year − estimated age. Very rough, shown only as a talking point.
Example: 60 inches around ÷ 3.1416 = 19.1 inches across. 19.1 × 4.5 (red maple) = about 86 years.
Reference table
Rule-of-thumb growth factors
These are rough rule-of-thumb factors for trees in yards and parks. Forest trees, street trees in tight pits and trees in dry climates often grow slower. Treat each number as a starting point, not a fact about your tree.
| Species | Growth factor | Age at 60 in around | Species guide |
|---|---|---|---|
| Red maple | 4.5 | about 86 years | Red maple guide |
| Silver maple | 3.0 | about 57 years | Silver maple guide |
| Sugar maple | 5.5 | about 105 years | Sugar maple guide |
| Norway maple | 4.5 | about 86 years | Norway maple guide |
| White oak | 5.0 | about 95 years | White oak guide |
| Northern red oak | 4.0 | about 76 years | Northern red oak guide |
| Pin oak | 3.0 | about 57 years | Pin oak guide |
| Green ash | 4.0 | about 76 years | Green ash guide |
| White ash | 5.0 | about 95 years | White ash guide |
| American elm | 4.0 | about 76 years | American elm guide |
| Black walnut | 4.5 | about 86 years | Black walnut guide |
| Shagbark hickory | 7.5 | about 143 years | Shagbark hickory guide |
| Black cherry | 5.0 | about 95 years | Black cherry guide |
| American beech | 6.0 | about 115 years | American beech guide |
| American linden (basswood) | 3.0 | about 57 years | American linden (basswood) guide |
| River birch | 3.5 | about 67 years | River birch guide |
| Paper (white) birch | 5.0 | about 95 years | Paper (white) birch guide |
| Quaking aspen | 2.0 | about 38 years | Quaking aspen guide |
| Eastern cottonwood | 2.0 | about 38 years | Eastern cottonwood guide |
| Flowering dogwood | 7.0 | about 134 years | Flowering dogwood guide |
| Eastern redbud | 7.0 | about 134 years | Eastern redbud guide |
| Eastern white pine | 5.0 | about 95 years | Eastern white pine guide |
| Douglas-fir | 5.0 | about 95 years | Douglas-fir guide |
| Scotch pine | 3.5 | about 67 years | See all trees |
| Austrian pine | 4.5 | about 86 years | See all trees |
| Horse chestnut | 8.0 | about 153 years | Horse chestnut guide |
| Ironwood (hophornbeam) | 7.0 | about 134 years | See all trees |
Ages in the table are rough estimates for a 60-inch circumference (about 19.1 inches across). Want to learn a species? Browse the tree species library.
For homeowners
An old tree is not always a weak tree
Many old trees are healthy and add a lot to a yard. Watch for real warning signs instead: dead limbs, cracks, fungus at the base or a new lean. Never climb or cut near power lines. Read is my tree dangerous? and the full homeowner guide to hiring a tree service.
For tree crews
Answer the age question on site
Customers love to know how old a tree is. Show them this method on your phone, then move on to the job. For the bid itself, use the tree job estimate builder and the tree height calculator. Before digging or grinding, check the critical root zone.
Questions about tree age
How do I measure a tree for this calculator?
Wrap a soft tape measure around the trunk 4.5 feet above the ground on the uphill side. Pull it snug and level, and read the inches. A string works too: wrap it, mark it, then lay it on a tape. Stay on the ground and away from power lines.
Why 4.5 feet?
That height is the US standard for diameter at breast height, or DBH. Measuring at the same height every time means numbers can be compared between trees, between years and between people.
What is a growth factor?
It is a rule-of-thumb number of years a species usually takes to add one inch of trunk diameter. The factors on this page are rough starting points for trees growing in yards and parks. They are rough. Change the number if you have better local data.
How accurate is this tree age estimate?
It is a rough guide, not a measurement. Two trees of the same species and size can differ in age by decades. A tree with good soil, water and sun grows faster. A crowded or stressed tree grows slower. Use the result as a ballpark only.
How can I find the exact age of a tree?
Count the rings on a clean stump cut near the ground, or have an arborist take a thin core sample with an increment borer and count the rings in it. Coring should be done by a trained person, because it leaves a small wound.
My species is not on the list. What do I use?
Pick "Other species" and type your own factor. If you are not sure, start with a middle value around 4 to 5, and treat the result as very rough. A local extension office or arborist may know a better number for your area.
What about a tree with several trunks?
This simple method is made for one main trunk. If the tree splits below 4.5 feet, measure the narrowest point below the split, or measure each stem. Either way, the age will be even rougher than usual.
Does tree age tell me if a tree is safe?
No. Age alone does not say if a tree is healthy or dangerous. Cracks, dead branches, fungus at the base, lifted soil or a new lean are better warning signs. If you are worried, ask a local insured arborist to look at it.
Why would a tree crew use a tree age calculator?
Customers often ask how old a tree is before a removal or a big prune. A quick estimate with the method shown builds trust. It also helps when you talk about heritage tree rules, which some cities base on trunk size. Short explanation, not legal advice.
Is anything I type sent to Lirevon?
No. The math runs in your browser. Your last numbers are kept only in this browser on this device so the form is filled in next time. Clear your browser data to remove them.
Own a tree service?
Know the tree. Then book the job.
Lirevon sets up missed-call text-back, an AI receptionist, follow-ups and review requests for tree companies, so the calls about big old trees turn into booked jobs.