Free pet calculators & care tools Convert your cat's age to equivalent human years using standard veterinary guidelines. The traditional 1:7 rule is biologically inaccurate.
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Calculated based on standard veterinary non-linear feline maturity and aging models.
Cats mature exceptionally fast during their first two years. A 1-year-old cat is physically similar to a 15-year-old human, and by age two, a cat is biologically equivalent to a 24-year-old adult. After age two, cats age much slower, roughly 4 human years per calendar year.
Indoor cats generally live between 12 to 15 years, though many live well into their late teens or even early twenties (equivalent to 100 human years) with proper diet, regular veterinary care, and an indoor lifestyle.
We use the standard veterinary non-linear feline maturity model. The first year accounts for 15 human years. The second year accounts for 9 human years. From age 3 onwards, every calendar year is equivalent to 4 human years.
Cats are generally classified as 'senior' once they reach 10 years of age (which is equivalent to 56 human years). 'Geriatric' cats are those aged 15 years and older (equivalent to 76 human years).
This site provides estimates and planning tools only. It does not replace veterinary advice, diagnosis, or treatment.