Pet
Cat Age in Human Years Calculator
Convert a cat's age to a rough human-equivalent age with the common two-year plus four-per-year guide.
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Formula
The first cat year counts as about 15 human years, the second adds about 9, and each later year adds about 4.
How it works
Early years are weighted heavily because kittens mature quickly, then the yearly addition settles to about four. Indoor and outdoor lifestyles still shift real ageing, so the figure stays rough.
FAQs
Why is the first year worth 15?
Kittens reach near-adult maturity within their first year.
Do cats age like dogs?
No. Cats follow a different curve, which is why they need their own calculator.
Is this veterinary advice?
No. It is a general age comparison only.
General information only, not veterinary advice.
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