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Tree Age Calculator

Estimated tree age from trunk circumference.

Estimate a tree's age from its trunk circumference at chest height and a species-specific annual growth factor.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

cm
cm/yr

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Age ≈ (circumference / π) / growth factor; oak ≈ 0.5 cm, pine ≈ 1.0 cm, redwood ≈ 1.3 cm per year.

In depth

Estimate a tree's age from its trunk circumference at chest height and a species-specific annual growth factor.