Cat Age Calculator: Cat Years to Human Years
Just like dogs, cats age on a curve rather than a simple one-to-one ratio. A one-year-old cat is already a teenager in human years, while a 15-year-old cat is a senior. This calculator converts your cat's age to the human equivalent and tells you its life stage.
The Cat Age Formula
The general veterinary guideline for feline aging is:
Second year = 9 more human years
Each year after = +4 human years
So a 2-year-old cat is about 24 human years old, and every year after that adds roughly 4 more.
Cat Life Stages
- Kitten — under 1 year
- Junior — 1 to 2 years
- Prime (adult) — 3 to 6 years
- Mature — 7 to 10 years
- Senior — 11 to 14 years
- Geriatric — 15 years and older
Example Calculation
- A 5-year-old cat: 24 + (3 x 4) = about 36 human years (prime adult)
- A 13-year-old cat: 24 + (11 x 4) = about 68 human years (senior)
FAQ
How old is a 10-year-old cat in human years?
About 56 human years. A 10-year-old cat is considered "mature" and may benefit from senior checkups.
How long do indoor cats live?
Indoor cats commonly live 12 to 18 years, and some exceed 20. Outdoor cats typically live shorter lives.
Do cats age slower than dogs?
Small cats and small dogs age at a similar pace after maturity, but cats tend to live longer than large-breed dogs.
Disclaimer: This calculator provides general estimates for reference only.