Convert your cat's age into human years and see which life stage your cat is in.
Last updated: October 31, 2026
Why "1 cat year = 7 human years" is wrong
Cats grow up very fast in their first two years and then age more slowly, so multiplying by 7 doesn't work. The chart used by vets (International Cat Care and the AAHA) is: • A 1-year-old cat ≈ 15 human years • A 2-year-old cat ≈ 24 human years • Each year after that ≈ 4 human years So a 3-year-old cat is about 28, a 10-year-old about 56 and a 15-year-old about 76 in human years. Growth is fast in the first year too: a 6-month-old kitten is about as developed as a 10-year-old child. Life stages show what care your cat needs. From 7 years, vets recommend a check-up at least once a year, and from 11 years twice a year. Indoor cats usually live 12–18 years, and some pass 20. The result is an estimate. Breed, weight, neutering and whether the cat goes outdoors all affect lifespan.
Common questions about cat age
About 15. Cats reach sexual maturity in their first year, which is why the first year counts the most.
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In full years.
Extra months (0–11).