Cat Age Calculator (Cat to Human Years)
Cats don’t age at a simple “1 year = 7 human years” rate. This Cat Age Calculator uses a more realistic curve so you can see your cat’s approximate age in human years and which life stage it’s in right now.
Convert your cat’s age to human years
Enter your cat’s current age and basic lifestyle to see:
- Approximate “human age” equivalent
- Life stage (kitten, young adult, adult, senior)
- Rough percentage of expected lifespan already lived
Convert Cat Years to Human Years
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This tool is for educational purposes only and does not replace professional veterinary advice, diagnosis or treatment.
Example
5-year-old indoor cat
- Approx. human age: ~36–40 years.
- Life stage: established adult (not a “senior” yet).
- Focus on weight control, dental care and enrichment.
How to read your cat’s “human age”
1. Early years are faster
Kittens and young cats “age” much faster in human-year terms during the first 1–2 years. That’s why a 1-year-old cat often behaves like a teenage human.
2. Adult years slow down
Once your cat reaches early adulthood, each calendar year adds fewer “human years” than during the kitten stage, but health checks are still critical.
3. Senior cats need closer follow-up
As your cat enters senior years, weight changes, appetite shifts, mobility issues or litter box changes are more important to track and discuss with your vet.
Want a full age chart?
After using the calculator, open the full guide to see kitten, adult and senior cat stages in a complete human-years chart.