Cats mature quickly: a one-year-old cat is roughly a 15-year-old human, and a two-year-old about 24. After that, each cat year adds about four human years. Enter your cat’s age to see the result and life stage.
Cat Age Calculator
Cat years to human years, with life stage.
Cat life stages
The AAHA/AAFP Feline Life Stage Guidelines group cats into four stages: kitten (birth to 1 year), young adult (1–6 years), mature adult (7–10 years) and senior (over 10 years). Each stage has different needs for food, vaccines and check-ups.
Frequently asked questions
How old is a 10-year-old cat in human years?
About 56 human years.
How long do indoor cats live?
Many indoor cats live into their mid-teens, and some reach 20. Read our guide to cat lifespan.
How often should an older cat see the vet?
Vets commonly recommend a check-up every six months once a cat is a senior, because problems such as kidney disease and hyperthyroidism are easier to manage when caught early.