Cat age
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Human equivalent age
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Convert your cat's age to human years with feline life stage math, from kitten to senior.
Enter your cat's age. Results update live.
Enter your cat's age to convert.
The first year of a cat's life equals about 15 human years and the second about 9, reflecting rapid kitten development. After age two, cats age roughly 4 human years per cat year, so a 10 year old cat is about 56 in human terms.
Veterinary charts split cats into kitten, junior, prime, mature, senior and geriatric stages. Knowing the stage helps you adjust food, play and vet visit frequency, since senior cats benefit from twice yearly checkups.