Cat Age Calculator
Convert your cat's age to human years.
Human-equivalent age
36 human years
Life stage
adult
Typical lifespan
15+ yr
Years remaining (avg)
~10.0
Year 1 = 15 human years. Year 2 = 9 more. After that, ~4 human years per cat year.
About
Cats age fast in their first two years (15 human years in year 1, 9 more in year 2), then about 4 human years per cat year after that. This calculator uses the standard veterinary formula and shows life stage and typical lifespan.
How to use
- Enter your cat's age in years.
- Pick indoor or outdoor (outdoor cats live shorter lives on average).
- See human-equivalent age and life stage.
FAQ
Why is the first year worth so much?+
Cats reach reproductive maturity around 6 to 12 months, the rough equivalent of a teenage human. Year 1 of cat life packs in puppyhood, adolescence, and early adulthood.
Indoor vs outdoor lifespan?+
Indoor cats average 12 to 18 years. Outdoor cats average 2 to 7 due to traffic, predators, disease, and parasites.