Cat Age Calculator
Convert cat years to human years and find your cat’s life stage, from kitten to senior.
About the Cat Age Calculator
Cats mature quickly: a one-year-old cat is roughly like a 15-year-old teenager. This cat age calculator converts your cat’s age into human years using the chart used by vets, and tells you which life stage your cat is in so you can adjust its care.
How to Use the Cat Age Calculator
- Enter your cat’s age in years (decimals are fine).
- Press Calculate.
- See the human-equivalent age and life stage.
Formula and How It Works
The first cat year equals about 15 human years and the second year adds 9 more, making 24. Every year after that adds about 4 human years. So a 10-year-old cat is about 56 in human years.
Frequently Asked Questions
How long do cats live?
Indoor cats commonly live 12–18 years, and many reach their twenties.
When is a cat a senior?
Cats are usually considered senior from about 11 years old, which is roughly 60 in human years.
Results are estimates for general information and are not medical or veterinary advice. Please speak to a qualified professional about your own situation.