Dog Age Calculator
Convert dog years to human years based on size, plus a DNA-based estimate - all in your browser.
Human Age
Adult
29
human years
Senior years start around 9 for medium breeds.
DNA-Based Estimate
48.6
human years
human ≈ 16 × ln(3) + 31 (UCSD methylation study)
Epigenetic aging is non-linear - dogs mature very fast early, then aging slows down.
Life Stage Timeline
Puppy 0-1 yrs
Adult 1-9 yrs
Senior 9+ yrs
≈13 yrs typical lifespan
These formulas are approximations. The first dog year counts as 15 human years and
the second adds 9 (24 total); after that each year adds 4-7 human years depending
on size (AKC guideline). The DNA estimate uses the UCSD methylation formula
(16 × ln(age) + 31). Every dog ages differently - consult your vet.
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