Cat Age Calculator
Convert your cat's age to human years
Frequently Asked Questions
A cat's first year equals about 15 human years, the second year adds 9 more (24 total by age 2), and each year after that adds about 4 human years. This reflects how cats mature very rapidly in their first two years, then age more gradually.
Cats reach sexual and near-full physical maturity within about 12 months — a growth pace far faster than humans — which is why that first year alone accounts for roughly 15 "human years" of development.
Yes, significantly — indoor cats avoid traffic, predators, disease exposure, and fights, and studies consistently show indoor cats living several years longer on average than outdoor or free-roaming cats.
Kitten (0-1 year), Junior (1-3), Prime (3-7), Mature (7-11), Senior (11-15), and Geriatric (15+) — veterinarians use these stages to guide the frequency and focus of checkups and preventive care.