Cat Age Calculator
Convert your cat's age to human-equivalent years using the veterinary-standard aging curve.
Human-equivalent age
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How it works
Year 1 ≈ 15 human years, year 2 adds ≈9, then ≈4 human years per additional cat yearFrequently Asked Questions
How do cat years convert to human years?
Cats mature very fast early: 1 cat year ≈ 15 human years, by year 2 a cat is roughly 24 in human terms, and each year after that adds about 4 human years — so a 5-year-old cat is roughly 36, and a 10-year-old cat is roughly 56.
Is the 'multiply by 7' rule accurate for cats?
No — it badly misrepresents cat aging, especially early on. A 1-year-old cat is not 7 in human terms; it's closer to a mid-teenager given how quickly cats reach physical and reproductive maturity.
At what age is a cat considered a senior?
Most veterinarians consider cats 'mature' around 7–10 years and 'senior' from about 11 years onward, roughly aligning with the 60+ human-year mark — a good time to discuss more frequent wellness checks with your vet.