Cat age calculator
A one-year-old cat is about 15 in human years, and a two-year-old about 24. After that, each year adds about 4 human years.
- Each year now adds
- 4 human years
- Cat’s actual age
- 6.0 years
A cat aged 6 years. Cats grow up fast: about 15 human years in year one, then 4 a year after their second birthday.
An estimate. Genes, health and lifestyle all affect how quickly a cat ages.
Cat years to human years
Using guidelines from vet associations, including International Cat Care.
| Cat’s age | Human years |
|---|---|
| 6 months | 8 |
| 1 year | 15 |
| 2 years | 24 |
| 3 years | 28 |
| 4 years | 32 |
| 5 years | 36 |
| 6 years | 40 |
| 8 years | 48 |
| 10 years | 56 |
| 12 years | 64 |
| 14 years | 72 |
| 16 years | 80 |
| 18 years | 88 |
| 20 years | 96 |
How we calculate this
This follows guidelines agreed by the American Animal Hospital Association, the American Association of Feline Practitioners and International Cat Care: about 15 human years for the first year, 24 by the second birthday, then about 4 for every year after.
For kittens under one, we work it out proportionally, so a six-month-old kitten comes out at around seven or eight.
Questions people ask
How old is my cat in human years?
Roughly 15 at one year old and 24 at two, then add 4 for each year after. So a 10-year-old cat is about 56.
Is one cat year seven human years?
No. Cats mature very quickly in their first two years, then age more steadily. The seven-year rule underestimates young cats and overestimates older ones.
How long do cats live?
Many cats live into their teens, and some reach 20 or more. Regular vet checks become more important as your cat gets older.
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