Cat Age Calculator
Convert your cat's age to the human equivalent using a formula that reflects how cats actually age — rapidly in kittenhood, then more slowly as adults.
How Cats Age
Cat Life Stages
Kitten (0–6 months): rapid development, equivalent to 0–10 human years. Junior (6 months–2 years): socially and physically maturing. Prime (3–6 years): peak condition. Mature (7–10 years): middle age. Senior (11–14 years). Geriatric (15+ years).
The Calculation
The first year of a cat's life = 15 human years. The second year adds 9 more (24 total). Each subsequent year adds approximately 4 human years. This reflects the rapid development in kittenhood that simple multiplication misses.
Senior Cat Care
From around 7 years (equivalent to 44 human years), cats benefit from biannual vet checks rather than annual. Key areas to monitor: kidney function, thyroid, dental health, weight changes, and mobility.
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