CALCULATOR · Pets
Cat Age Calculator
Convert cat years to human years with the accepted veterinary convention (15 · +9 · +4).
Show formula
Year 1 ≈ 15 · year 2 ≈ +9 · each later year ≈ +4
Inputs
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Result
Your result appears here
Enter Age (years) and the result fills in as you type.
How it works
- Enter your cat's name and breed.
- Enter the cat's age.
- Read the human-equivalent estimate and life stage.
Frequently asked questions
What convention does the cat calculator use?
The widely accepted veterinary convention: the first cat year counts roughly as 15 human years, the second adds about 9 (24 at age two), and each year after adds about 4.
Does breed matter for cats?
Unlike dogs, feline medicine does not materially differentiate aging by breed for this conversion, so one general method applies to all cats.
Examples
- How old is a 3-year-old cat in human years?
- About 28: 15 for the first year, 9 for the second, then roughly 4 a year. That places the cat in its adult stage.
- And a 1-year-old kitten?
- About 15 — the first year covers the fastest development, which is why it counts for so much.
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