Free dog & cat age calculator — enter age and size, see human years, life stage and care tips.
Human-year equivalents by adult size, from the size-based method used by veterinary guidance (AKC, based on AVMA). Figures are estimates.
| Dog age | Small | Medium | Large | Giant |
|---|
Year 1 = 15 human years, year 2 = 24, then +4 per year.
| Cat age | Human years | Life stage |
|---|
Human Years to Dog Years Calculator — work backwards from a human age to a dog's age.
Dog age by breed: Labrador Retriever · German Shepherd · Golden Retriever
About 36. (15 for year one, 9 more for year two, then 4 per year: 24 + 3 × 4 = 36.)
It depends on size: small about 56, medium about 64, large about 72, giant about 80.
No — that is an old myth. Dogs mature very fast in their first two years (about 24 human years by age two) and then age more slowly, with larger breeds aging faster after age two.
On average dogs live about 10–13 years (giant breeds 7–10, toy breeds up to 15–18). Cats commonly live 13–17 years, and many reach their late teens with good care.
Roughly: small breeds around 12 years, medium around 10, large around 8, and giant breeds as early as 6–7. Senior pets benefit from regular vet check-ups and weight control.