Cat Age Calculator
Estimate a cat's age in human-equivalent years.
How cats age
Cats, like dogs, do not age on a simple yearly multiplier. They mature very quickly in the first two years — a one-year-old cat is roughly a young adult — and then age more steadily after that. This estimates a cat's human-equivalent age using that more realistic pattern rather than a flat multiply-by-seven.
Enter your cat's age for a human-equivalent estimate.
The fast start, then a steady climb
The pattern worth knowing is that a cat reaches roughly the human equivalent of the mid-teens by its first birthday and young adulthood by its second, after which each further year adds around four human-equivalent years. So the early ageing is dramatic and the later ageing gradual. Indoor cats commonly live well into their teens and sometimes beyond twenty, so the human-equivalent numbers climb high for a well-cared-for cat.
Common questions
How fast does a cat age in its first year?
Very fast — a one-year-old cat is roughly a human teenager, and a two-year-old is a young adult, before ageing slows to a steadier pace.
How long do cats live?
Indoor cats often reach their late teens and sometimes beyond twenty, so the human-equivalent age climbs high for a well-cared-for cat.
Is anything uploaded?
No. The estimate happens in your browser.