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Estimates for healthy dogs; breeds vary. Everything is calculated in your browser; nothing you type is uploaded.

The size chart gives about 15 human years for the first year and 24 at two, then 4–7 years per dog year depending on size. The DNA-methylation formula (Wang et al., 2020) is 16 × ln(age) + 31.

A 6-year-old medium dog is about 42 in human years by the size chart, and about 60 by the epigenetic formula.