Cat Age Calculator
Turn your cat's age into human years using the standard feline aging chart.
A cat races through its first two years — hitting roughly a 24-year-old human by its second birthday — then settles into about four human years for each year after.
How it works
Cats race through childhood. By the end of the first year a cat is roughly a 15-year-old human, and by the end of the second it is around 24 — most of a lifetime's growing up packed into 24 months.
After that the pace steadies to about four human years for every cat year. So a five-year-old cat is comparable to a human in their mid-thirties, not a senior at all.
Enter your cat's age and the tool applies this well-established chart. It works the same for indoor and outdoor cats, though lifestyle affects how long they actually live.
Frequently asked questions
How old is a 1-year-old cat in human years?
About 15. Cats mature extremely fast in their first year, reaching the rough equivalent of a mid-teen human before slowing down.
When is a cat considered senior?
Vets generally call cats senior from around 11 human-equivalent years of age, which is roughly a cat in its early 60s in human terms.
Do indoor and outdoor cats age differently?
The human-year math is the same, but indoor cats tend to live longer because they face fewer hazards, so they more often reach those higher ages.