Cat Age Calculator
Convert your cat's age into human years using the standard veterinary chart: 15 human years for the first year, 24 by the second, and four more for every year after that.
Cats pack a lot of growing up into their first couple of years, then settle into a steadier pace. The widely used veterinary chart counts a cat's first year as about 15 human years, the second year brings the total to 24, and each year after adds roughly four human years. Unlike dogs, cat aging doesn't vary much by breed or size, so a single chart works well for most cats. This calculator applies that chart to your cat's age.
How cat years convert to human years
The first two years count for a lot; after that it's a steady four human years per calendar year.
Year 2 = +9 (24 total at age 2)
Each year after = +4 human years
| Cat age | Human age | Life stage |
|---|---|---|
| 1 year | 15 | Junior |
| 2 years | 24 | Young adult |
| 7 years | 44 | Mature |
| 11 years | 60 | Senior |
| 15 years | 76 | Super-senior |
Worked example
A 7-year-old cat:
| Years 1–2 | 24 |
| 5 more years × 4 | 20 |
| Human-age equivalent | ≈ 44 years |
Cat life stages
Vets group cats into life stages: kitten and junior up to about two years, prime and mature through the middle years, senior from around eleven, and super-senior past fifteen. Knowing the stage helps you adjust diet, activity and check-up frequency — senior cats benefit from twice-yearly vet visits to catch issues like kidney disease and arthritis early. Indoor cats commonly reach their late teens, and some pass twenty.