Convert your cat's age into human years using the common first-, second-, and each-subsequent-year method.
Cat Age Calculator
Pets
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Enter your cat's age in years (decimals OK for months).
Click Calculate to see the equivalent human age and life stage.
A common convention: the first cat year equals 15 human years, the second adds 9 (to 24), and each year after adds 4. Indoor cats commonly live 15+ years; outdoor cats average fewer. This is an approximation — breeds and care vary.
No. Multiplying by 7 is outdated. The first two years of a cat's life bring rapid maturity, so the 15-9-4 method is more accurate for domestic cats.