Cat Age Calculator
Find out how old your cat is in human years. Our calculator uses veterinary research to give accurate results for all life stages.
About This Calculator
Cats age differently than humans, especially in their first two years. A one-year-old cat is developmentally similar to a 15-year-old human, and by age two, they're equivalent to a 24-year-old. After that, each cat year is roughly equal to 4 human years.
Understanding your cat's life stage helps you provide better care. Kittens need more nutrition and socialization, while senior cats benefit from more frequent vet checkups and adjusted diets. Our calculator categorizes cats into six life stages: Kitten, Junior, Prime, Mature, Senior, and Geriatric.
Frequently Asked Questions
How do I calculate my cat's age in human years?
Year 1 = 15 human years, Year 2 = +9 (total 24), then each additional year = +4 human years. For example, a 5-year-old cat is approximately 36 in human years (24 + 3×4).
What life stage is my cat in?
Cats go through 6 life stages: Kitten (0-6 months), Junior (6 months - 2 years), Prime (2-6 years), Mature (6-10 years), Senior (10-15 years), and Geriatric (15+ years).
Do indoor cats age slower than outdoor cats?
Indoor cats generally live longer (12-18 years vs 2-5 years for outdoor cats), but the aging rate calculation is the same. Indoor cats may appear younger at an older age due to better health and less stress.