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Free Dog Age Calculator

Convert your dog's age to human years with science-based methods (AKC size model + the 2019 epigenetic clock) instead of the inaccurate ×7 rule — with breed size and life stage. Private and free.

Works offline once loaded
Your dog's age
yearsmonths
Breed size

Typical adult weight: small < 10 kg · medium 10–25 kg · large 25–45 kg · giant > 45 kg.

In human years
🐶 29 human years
Adult
Typical lifespan progress25%

Share of a typical ~12-year lifespan for this size class — an average, not a prediction.

Epigenetic-clock estimate49 human years

From the 2019 DNA-methylation study (16 × ln(age) + 31), most accurate for adult dogs.

💡 Forget “1 dog year = 7 human years” — dogs age fast in their first two years, then more slowly, and size matters.

⚠️ These are estimates that vary by breed and individual dog. They are not a substitute for veterinary advice — see your vet for your dog's health.

🔒 Nothing is uploaded — the conversion happens entirely in your browser.

Common uses

  • Dog Years to Human YearsConvert your dog's age into human years with a science-based model, not the ×7 myth.
  • How Old Is My Dog in Human Years?Enter your dog's age and size to see the human-age equivalent and life stage.
  • Puppy Age CalculatorSee how fast a puppy ages in its first year in human-year terms.
  • Dog Age Calculator by SizeCompare how breed size changes your dog's human-age equivalent.
  • Small Dog Age CalculatorHuman-years conversion tuned for small breeds.
  • Large Dog Age CalculatorHuman-years conversion tuned for large breeds.

How It Works

Converts your dog's age into human years using two science-based methods instead of the inaccurate "multiply by 7" rule. The AKC size-based model counts about 15 human years for the first year, 9 for the second, then a per-year amount that depends on breed size; the 2019 epigenetic-clock formula (16·ln(age) + 31) is shown for adult dogs. Everything is computed in your browser.

  1. 1
    Enter your dog's age
    Use years and months — puppies age very fast, so months matter early on.
  2. 2
    Pick the breed size
    Small, medium, large or giant. Smaller dogs live longer and age more slowly; giant breeds age fastest.
  3. 3
    See the human-age equivalent
    You get the human-years estimate, the life stage (puppy → senior), and the epigenetic-clock estimate for adult dogs.
  4. 4
    Why not ×7?
    Dogs mature quickly in their first two years and then age more gradually, so a flat multiplier is wrong — especially for puppies and large breeds.

Nothing is uploaded — your dog's age is converted entirely in your browser.

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Frequently Asked Questions