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Dog Years Calculator

Equivalent human age for a dog.

Estimate the human-equivalent age of a dog using a size-aware formula that accounts for breed weight class.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

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

Modern model: human age ≈ 16 · ln(dog age) + 31 for medium dogs, with a small adjustment for small (−1 yr/dog yr) and large (+1 yr/dog yr) breeds.

In depth

Estimate the human-equivalent age of a dog using a size-aware formula that accounts for breed weight class.