Cat Age Calculator
Convert your cat's age to human years using AAHA guidelines and find their life stage with care recommendations.
Human equivalent age
32 years
Life stage
Prime
Expected lifespan
13-17 years
27% of lifespan elapsed
Screening recommendations
Annual vet visits; dental cleanings; maintain healthy weight; watch for early signs of arthritis.
This calculator converts your cat's age to human-equivalent years using AAHA (American Animal Hospital Association) guidelines. The first year of a cat's life equals 15 human years, the second year adds 9 more (24 total), and each year after that adds approximately 4 human years. Life stages — Kitten, Junior, Prime, Mature, Senior, and Geriatric — are assigned based on AAHA age brackets and come with tailored veterinary care recommendations.
How this tool works
This calculator converts your cat's age to human-equivalent years using AAHA (American Animal Hospital Association) guidelines. The first year of a cat's life equals 15 human years, the second year adds 9 more (24 total), and each year after that adds approximately 4 human years. Life stages — Kitten, Junior, Prime, Mature, Senior, and Geriatric — are assigned based on AAHA age brackets and come with tailored veterinary care recommendations.
Worked example
A 5-year-old indoor cat has a human-equivalent age of 36 years (24 + 3×4). At this age, AAHA classifies the cat as Prime — active, healthy, and at peak vitality. Indoor cats average 13-17 years, so this cat has used roughly a third of its expected lifespan. Annual vet visits and dental cleanings are the main care priorities at this stage.
Frequently asked questions
How do you calculate cat age in human years?
According to AAHA guidelines, a cat's first year equals 15 human years, the second year adds 9 more (24 total), and each subsequent year adds 4. A 10-year-old cat is roughly equivalent to a 56-year-old human.
What is the Geriatric life stage for cats?
AAHA defines geriatric cats as 15 years and older — equivalent to a human in their mid-70s or older. At this stage, veterinary visits every 3 months are recommended, with bloodwork, blood pressure checks, and thyroid screening at each visit.
Do indoor cats really live longer?
Yes. Indoor cats average 13-17 years versus 10-14 for outdoor or indoor/outdoor cats. Outdoor cats face risks including vehicles, predators, infectious disease, and parasites that significantly reduce average lifespan.