Cat Age Calculator
Convert your cat's age into the human equivalent and find its life stage.
About the Cat Age Calculator
Enter your cat's age in years (decimals for months, such as 0.5 for six months). The calculator gives the human-equivalent age and the life stage, with a chart across a cat's lifespan.
Cats mature fast: a 1-year-old cat is roughly a 15-year-old human and a 2-year-old about 24. After that each cat year is about 4 human years. The 2021 AAHA/AAFP Feline Life Stage Guidelines group cats as kittens (to 1 year), young adults (1–6), mature adults (7–10) and seniors (over 10).
The formula
15 + 9 + 4 × (years − 2)
Worked example
An 8-year-old cat
- First year: 15; second year: + 9 = 24
- Six more years × 4 = 24
- Human equivalent: 48, a mature adult
Things to keep in mind
- A rough comparison of life stages, not a precise biological age.
Questions people ask
How long do cats live?
Indoor cats commonly live 12–18 years, some past 20.
How often should a senior cat see a vet?
At least every 6 months is often recommended.
Is the old “multiply by 7” rule right?
No: it underestimates young cats and overestimates old ones.