How old is my tree?
How old is your tree, and how big will it get?
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How do you tell a tree’s age without cutting it down?
By its trunk. Measure the circumference at 4½ feet up, divide by π for the diameter, then run that through growth curves for the species and the climate. CanopyKeep uses the USDA Urban Tree Database — decades of measured street and park trees, the dataset behind i-Tree — rather than the single rule-of-thumb growth factor most tree age calculators multiply by.
How fast do trees grow?
It depends on the species and, just as much, on where it is standing. The same red oak puts on roughly twice the trunk diameter in Georgia that it does in Minnesota. That is why this asks where the tree is before it will give you a number: a growth rate with no climate region behind it is a confident answer about a different tree.
How accurate is estimating tree age from diameter?
It is an estimate and it says so. An open-grown yard tree with room, light and water tracks the curve well. A tree that spent twenty years crowded, or arrived as a large transplant, or grew in a sidewalk cutout, can sit well off it. Read the age as a range, and the growth projection as the more useful half of the answer.