Cat Age Calculator – Cat Years to Human Years
Convert your cats age to human years. Cats age faster in their first two years.
How Cat Aging Works
Cats age rapidly in their first two years: a 1-year-old cat is roughly equivalent to a 15-year-old human; a 2-year-old cat is about 25 in human years. After that, each cat year equals approximately 4 human years.
Indoor cats typically live 12–18 years; outdoor cats average 10–12 years. With good veterinary care, nutrition, and environment, many cats reach their 20s — equivalent to a human in their 90s.
AAFP Cat Life Stages
The American Association of Feline Practitioners defines these life stages:
- Kitten: 0–6 months
- Junior: 7 months – 2 years
- Prime: 3–6 years (human equivalent: 28–40)
- Mature: 7–10 years (human equivalent: 44–56)
- Senior: 11–14 years (human equivalent: 60–72)
- Geriatric: 15+ years (human equivalent: 76+)
Care Tips by Life Stage
Kitten: Vaccines, parasite prevention, spaying/neutering. Adult: Annual wellness exams, dental cleanings, weight management. Senior: Bi-annual vet visits, kidney function monitoring (chronic kidney disease is the leading cause of senior cat death), joint support, and richer-protein diets.
Frequently Asked Questions
How old is a 10-year-old cat in human years?
A 10-year-old cat is approximately 56 human years old — well into the mature/early senior stage. Regular vet checkups are especially important at this age.
Do indoor cats age differently than outdoor cats?
Indoor cats live longer on average (12–18 years vs 10–12 for outdoor cats) because they face fewer risks. However, they can suffer from obesity and boredom — enrichment and a healthy weight are key.
What is the oldest cat ever recorded?
Creme Puff of Austin, Texas lived to 38 years and 3 days. The Guinness World Record holder died in 2005.