Cat Age Calculator – Cat Years to Human Years
Enter your cat’s age to see the human-years equivalent and the life stage your cat is in.
About this tool
Cats age quickly early on and then more slowly. A common veterinary guide counts the first year as about 15 human years, the second as about 9 more (so a two-year-old cat is around 24), and then roughly 4 years for every year after that. By that measure a 10-year-old cat is about 56 and a 15-year-old is around 76.
Knowing the life stage helps you plan care. Kittens need frequent feeding and vaccinations, adult cats need steady routines and dental care, and senior cats (around 11 and older) benefit from twice-yearly check-ups, because kidney disease, thyroid problems and arthritis are common and are easier to manage when found early. Indoor cats often live longer than outdoor cats, and many reach their late teens.
This tool is an estimate meant to be fun and useful, not a medical measurement.
Frequently asked questions
How old is a 1-year-old cat in human years?
About 15 human years.
How long do cats usually live?
Many indoor cats live 12 to 18 years, and some live into their twenties with good care.
When is a cat considered a senior?
Generally from about 11 years old. Your vet may recommend blood and urine tests from this point.
Do indoor and outdoor cats age differently?
Biologically similar, but indoor cats usually live longer because they face fewer injuries and infections.
General information only, not veterinary advice. Talk to your vet about your own pet.