Convert a cat's age to human equivalent years and identify the life stage.
Cats reach the equivalent of 24 human years within two calendar years, then age at a steady four years per year. Unlike dogs the rate does not vary much with size, but environment matters greatly. Outdoor cats face traffic, disease and predation, which roughly halves expected lifespan compared with indoor-only cats.
Cat Age
First year counts 15 human years, second counts 9, then 4 per year thereafter
First year counts 15 human years, second counts 9, then 4 per year thereafter Cats reach the equivalent of 24 human years within two calendar years, then age at a steady four years per year. Unlike dogs the rate does not vary much with size, but environment matters greatly.
Outdoor cats face traffic, disease and predation, which roughly halves expected lifespan compared with indoor-only cats.
This calculator takes 2 inputs: Cat's age, Living environment. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.