Cat Age Calculator
See your cat’s age in human years.
Cat age
Cats don’t have dogs’ size-based aging spread, so one formula applies regardless of breed.
About 36 human years
This is a guideline approximation based on published veterinary aging guidance, not an exact measurement for your individual cat — see the life stage reference chart for the underlying figures and sources, and check with your vet for anything health-related.
Frequently asked questions
- Does cat breed or size change the calculation?
- Not the way it does for dogs — cats don't have the same dramatic size-based lifespan spread across breeds, so one formula is used regardless of breed or size.
- Why do cats age so fast in the first two years?
- A cat reaches physical and reproductive maturity within its first year or two, which is why the first two years account for 24 of the human-year equivalent before the rate settles down to about 4 per year.
- My cat is a senior — what does that mean for care?
- Veterinary guidance (AAHA/AAFP) generally considers cats over 10 years old seniors, recommending more frequent checkups — see the life stage reference chart for the full breakdown.