Dog & Cat Age in Human Years Calculator
Determine your dog or cat's biological human age using the American Veterinary Medical Association (AVMA) size-adjusted life stage methodology.
The popular rule of multiplying by 7 is scientifically outdated. Dogs and cats develop rapidly during their first two years (reaching roughly 24 human years by age 2), followed by size-dependent metabolic aging rates.
Veterinary Wellness Focus for This Life Stage
Peak physical vitality and muscular health. Maintain consistent daily exercise, parasite preventatives (flea/tick/heartworm), and annual veterinary dental cleanings.
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How it works
Select pet species (Dog or Cat).
For dogs, choose adult weight category (Small, Medium, Large, or Giant).
Input current chronological years and months to reveal equivalent human age and life stage wellness tips.
Frequently asked questions
Why is the 7-year dog rule wrong?
Dogs mature to full adulthood within their first two years (reaching roughly 24 human years by age 2), then age at rates dictated by their size: small dogs age about 4 human years annually, while giant breeds age 7 to 8 human years per calendar year.
How old is a 10-year-old cat in human years?
A 10-year-old cat is roughly equivalent to a 56-year-old human (24 years for the first two years, plus 4 years for each of the subsequent 8 years).
Is this tool free?
Yes. The site is supported by ads, so you never pay or need to create an account.
Does it work on mobile?
Yes. The page adapts to your screen and does not require installing any app.