🐱Cat Age Calculator
How old is your cat in human years? Enter years and months to find out — plus their life stage.
Your cat
In human years
36 years old
Life stage: Young adult
cat age
5.0 yrs
human age
36
life stage
Young adult
Cats age fastest in their first two years, then slow down to about 4 human years per cat year.
How it works
Cats grow up fast, then age more slowly:
- First year ≈ 15 human years
- Second year adds 9 (24 by age 2)
- Every year after adds about 4
Life stages: kitten under 1, young adult 1–6, mature 7–10, senior 11+.
Worked example
A 5-year-old cat: 15 + 9 + (3 × 4) = 36 human years — a young adult.
Questions people ask
No. Cats mature much faster early on — a 1-year-old cat is like a 15-year-old person.
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Last updated October 8, 2026. These results are friendly estimates to help you plan — always double-check before buying or making big decisions.