Convert your cat's age into human years using the standard veterinary formula — and see the full cat-years chart below.
| Cat's age | Human years |
|---|---|
| 1 year | 15 |
| 2 years | 24 |
| 3 years | 28 |
| 5 years | 36 |
| 7 years | 44 |
| 10 years | 56 |
| 13 years | 68 |
| 16 years | 80 |
Like dogs, cats grow up fast and then age gently — so "multiply by seven" doesn't hold. The standard rule is: the first year is about 15 human years, the second year adds about 9 (a 2-year-old cat is roughly 24), and every year after adds about 4. That's the formula this calculator uses.
Vets often group cats as kitten (0–1), young adult (1–6), mature (7–10), senior (11–14), and geriatric (15+). Many well-cared-for indoor cats comfortably reach their late teens, and some sail past 20.
This is a general estimate for fun and information, not veterinary advice. Every cat is an individual — your vet can advise on real health and life stage.