Cat age in human years
Enter your cat's age: the conversion follows the standard chart used by veterinarians, along with the matching life stage.
| Cat's age | Human years | Life stage |
|---|---|---|
| 6 months | 10 | Kitten |
| 1 year | 15 | Junior |
| 2 years | 24 | Junior |
| 4 years | 32 | Adult |
| 6 years | 40 | Adult |
| 8 years | 48 | Mature |
| 10 years | 56 | Mature |
| 12 years | 64 | Senior |
| 15 years | 76 | Geriatric |
| 20 years | 96 | Geriatric |
How cat years are converted
Cats mature very quickly during their first two years: at 12 months a cat is roughly the equivalent of a 15-year-old teenager, and by 24 months it has reached about 24 human years. After that, aging levels off, and the standard veterinary chart adds about 4 human years for each additional year of a cat's life. Unlike dogs, body size makes little difference: a well-cared-for indoor cat typically lives 12 to 16 years, and it's not unusual for one to pass 20 — the equivalent of nearly a full human century.
A cat's life stages
Veterinarians recognize six stages: kitten (up to 6 months), junior (up to 2 years), adult (3–6 years), mature (7–10), senior (11–14), and geriatric (15 and up). Knowing your cat's stage helps you pick the right food and schedule check-ups: from around age 7–8, many vets recommend a yearly exam with blood work, since kidneys and the thyroid are the weak spots of aging cats. This tool provides estimates only and is not a substitute for advice from a licensed veterinarian.