Feline age converter
My Cat's Age in Human Years
Use the slider to find the human equivalent of your cat's age — and understand which life stage they're in.
A 5-year-old cat is approximately 36 years old in human terms.
5
years (cat)
36
years (human)
Full chart — 1 to 20 years
| years | years | Life stage |
|---|---|---|
| 1 | 15 | Kitten |
| 2 | 24 | Young adult |
| 3 | 28 | Young adult |
| 4 | 32 | Adult |
| 5 ← | 36 | Adult |
| 6 | 40 | Adult |
| 7 | 44 | Mature adult |
| 8 | 48 | Mature adult |
| 9 | 52 | Mature adult |
| 10 | 56 | Senior |
| 11 | 60 | Senior |
| 12 | 64 | Senior |
| 13 | 68 | Senior |
| 14 | 72 | Senior |
| 15 | 76 | Geriatric |
| 16 | 80 | Geriatric |
| 17 | 84 | Geriatric |
| 18 | 88 | Geriatric |
| 19 | 92 | Geriatric |
| 20 | 96 | Geriatric |
Frequently asked questions about cat age
How do I calculate my cat's age in human years?
The most accurate veterinary method: the first year of life equals 15 human years, the second equals 24, then each additional year equals approximately 4 human years. So a 5-year-old cat equals 36 human years, a 10-year-old cat equals 56.
At what age is a cat considered old?
Vets consider a cat 'mature' from age 7, 'senior' from 10–11, and 'geriatric' from 15. The average lifespan of a domestic cat is 12 to 18 years, but some live to 20 and beyond.
What is the human equivalent of a 1-year-old cat?
A 1-year-old cat corresponds to approximately 15 human years. This rapid progression is explained by the very accelerated sexual and physical maturation of cats during their first year of life.
Is a 10-year-old cat old?
A 10-year-old cat is considered senior — the equivalent of approximately 56 human years. They're not yet elderly, but it's the age when an annual vet check including blood work becomes strongly recommended to detect age-related diseases early (kidney disease, hyperthyroidism).