Free cat age calculator
How old is your cat (or kitten) in human years? Enter the age or birthday and we’ll convert it using the chart vets and cat charities use, then show your cat’s life stage and what it means for care.
Reviewed October 2026 · By Shoaib A. · See sources
Your cat's human age will appear here.
Plus their life stage and what that stage means for care.
Quick answer
A cat’s first year equals about 15 human years, and the second year adds about 9 more, so a 2-year-old cat is about 24. After that, each cat year equals roughly 4 human years: a 10-year-old cat is about 56 and a 15-year-old about 76 (International Cat Care). Kittens age fastest: a 6-month-old kitten is roughly like a 10-year-old child.
Full chart
Find your cat’s age in years to see the human equivalent. The pattern is simple: 15 at one year, 24 at two, then about 4 more for every year after that.
Kittens
Kittens race through childhood. In their first few months they gain about 2 “human years” every month, reaching the equivalent of a 15-year-old teenager by their first birthday (International Cat Care).
Not sure how old your kitten is? Our kitten age calculator estimates age from teeth, eyes, ears and weight, and the kitten timeline explains what each stage needs.
The maths
This is the same method used by International Cat Care, Purina and VCA Animal Hospitals (iCatCare; Purina; VCA).
The “times 7” rule comes from dogs and doesn’t fit cats. Cats reach adulthood within their first year, which the 7× rule would call 7 human years. And a 20-year-old cat is about 96 in human terms, not 140.
Life stages
The 2021 AAHA/AAFP Feline Life Stage Guidelines, written for vets, group cats into these stages (AAHA/AAFP guidelines):
International Cat Care uses a slightly different split: kitten 0–6 months, junior 7 months to 2 years, adult 3–6 years, mature 7–10, senior 11–14 and super senior 15+ (iCatCare). Either way, the idea is the same: care needs change as your cat ages.
Lifespan
Published averages vary with the data used:
Cornell’s Feline Health Center notes that living indoors is one reason cats are living longer, and vets now regularly see cats in their twenties (Cornell). The oldest cat on record, Creme Puff from Austin, Texas, lived to 38 years and 3 days, which is about 168 in human years by this chart (Guinness World Records).
About 15. Cats grow up very fast: by their first birthday they are roughly like a 15-year-old teenager.
About 56. After age 2 (24 human years), each cat year adds about 4 human years: 24 + 4 × 8 = 56.
About 76 in human years.
No. The 7× rule doesn’t fit cats. The first year equals about 15 human years, the second about 9 more, and each year after that about 4.
About 10. Kittens gain roughly 2 human years per month in their first 7 months.
The 2021 AAHA/AAFP guidelines call cats seniors from 10 years old. International Cat Care uses 11 years, with “super senior” from 15.
Vets generally say a cat is a kitten from birth up to 1 year. Most cats can switch to adult food at about 12 months; large breeds may need kitten food for longer.
Many indoor cats live into their mid-to-late teens. Published averages range from about 12 years (large UK study, all cats) to 16–18 years (VCA and Purina, indoor cats), and some cats reach their twenties.
