How cat years work
Kittens grow up fast: the first year is roughly 15 human years, and by the end of the second year a cat is about 24. After that, each cat year adds around four human years. Because cats often live into their late teens, a “senior” cat can still have many good years ahead.
Cat years to human years chart
| Cat 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 |
| 20 years | 96 |
Human-year equivalents are approximate and vary by individual.
Just brought one home? Our new kitten checklist walks you through the first week, and why cats purr decodes one of their most charming habits.
Frequently asked questions
How do you calculate a cat’s age in human years?
A cat’s first year is roughly 15 human years, the second year adds about nine more (reaching 24), and each year after that adds around four human years. So a typical 5-year-old cat is about 36 in human terms.
Is one cat year equal to seven human years?
No. Like dogs, cats mature very quickly early on and then age more steadily. The “×7” rule badly overstates a kitten’s age and understates a senior cat’s, which is why a stage-based calculation is more accurate.
When is a cat considered senior?
Cats are generally considered mature at around 7 and senior from about 10–11. Indoor cats often live well into their late teens or beyond, so senior care can last many happy years.