Cat Age Calculator
How old is your cat in human years?
3 years
1 20 years
Human years
28 years
Adult
Your cat is in their prime — independent, confident, and full of character.
Put this calculator on your site
Free forever. Add the PetYears age calculator to your blog or website in seconds.
Cat age chart (every age in human years)
| Cat years | Human years |
|---|---|
| 1 year | 15 years |
| 2 years | 24 years |
| 3 years | 28 years |
| 4 years | 32 years |
| 5 years | 36 years |
| 6 years | 40 years |
| 7 years | 44 years |
| 8 years | 48 years |
| 9 years | 52 years |
| 10 years | 56 years |
| 12 years | 64 years |
| 15 years | 76 years |
| 18 years | 88 years |
| 20 years | 96 years |
How do you calculate a cat's age in human years?
The first year of a cat's life equals about 15 human years. The second year adds about 9 more, and each year after that counts as roughly 4 human years.
How old is a 5-year-old cat in human years?
A 5-year-old cat is approximately 36 human years old (15 + 9 + 4 + 4 + 4).
At what age is a cat considered senior?
Cats are generally considered senior from about 7 years of age, which is equivalent to roughly 44 human years.
Do indoor cats age differently than outdoor cats?
Indoor cats tend to live longer — often 15 to 20 years — compared to outdoor cats, which average 10 to 15 years due to higher risks.