Cat Age Calculator
Convert cat years to human years with the AAHA/AAFP table. Get the lifestage label, plus a months-precise human-age equivalent for kittens and seniors.
Your cat
Human age equivalent (AAHA)
28 human years
Your cat is at the equivalent of a 28-year-old human, in their early adult years.
Cat age
3 years
The age you entered, normalized to years and months.
Lifestage (AAFP 2021)
Adult
Prime years. Routine wellness exams once a year.
AAFP feline lifestages
- Kitten0 to 1 year
- Junior1 to 2 years
- Adult3 to 6 years
- Mature7 to 10 years
- Senior11 to 14 years
- Geriatric15+ years
Frequently Asked Questions about the Cat Age Calculator
How is cat age converted to human years?
This calculator uses the AAHA/AAFP convention. Year 1 of a cat equals about 15 human years, year 2 adds 9 more (so a 2-year-old cat is roughly 24 in human years), and every year after that adds 4. Kittens under 1 year ramp linearly from 0 to 15.
Is the old multiply-by-7 rule accurate for cats?
No. Cats mature very fast in their first two years and then age more slowly, so a flat 7x multiplier overshoots kittens and undershoots middle-aged cats. The AAHA table is the standard most US veterinarians use today.
What are the AAFP feline lifestages?
The 2021 AAFP Feline Life Stage Guidelines define six stages: kitten (under 1 year), junior (1 to 2 years), adult (3 to 6 years), mature (7 to 10 years), senior (11 to 14 years), and geriatric (15 years and older).
How long do indoor cats typically live?
Indoor cats average 12 to 15 years, and many reach 18 to 20 with good care. Outdoor cats live noticeably shorter due to traffic, predators, and infectious disease. The calculator flags any age above 15 as exceeding the typical indoor lifespan.
How do I estimate a stray or rescue cat's age?
Vets use teeth, coat, eye clarity, and muscle tone as clues. Kittens get their permanent teeth around 6 months, mild tartar appears by 1 to 2 years, the iris starts to look cloudy around 12 years, and noticeable muscle loss usually means 10 years or older.
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