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Dog age calculator

How old is your dog in human years? Enter their age and adult size for an estimate based on the size-adjusted AKC / AVMA method — far more accurate than the old “multiply by seven” rule — plus a note on their current life stage.

Your dog’s age
Adult size

An estimate based on breed size — individual dogs age differently. Your vet can advise on your dog’s life stage.

How the calculation works

This calculator uses the size-adjusted method published by the American Kennel Club (AKC) and AVMA, which reflects how dogs really age rather than the simplistic “× 7” myth. A dog’s first year counts for roughly 15 human years, the second year adds about 9 more (so a two-year-old dog is around 24), and every year after that adds a size-dependent amount:

  • Small (≤ 9 kg): +4 human years per year
  • Medium (10–22 kg): +5 human years per year
  • Large (23–40 kg): +6 human years per year
  • Giant (> 40 kg): +7 human years per year

Larger and giant breeds age faster and reach their senior years sooner, which is why size matters so much. The life-stage labels (Puppy, Young adult, Mature adult, Senior, Geriatric) follow the AAHA canine life-stage framework, with senior years starting earlier for bigger dogs.

For the curious: a 2020 epigenetic study proposed an alternative formula based on DNA methylation in Labradors — human age ≈ 16 × ln(dog age) + 31. It’s a fascinating line of research, though the size-adjusted AKC / AVMA approach above remains the more practical, widely used guide for everyday pet owners.

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