Cat Age Calculator

Convert your cat's age to human years and see its life stage, with the chart vets use. For a person's age, use the age calculator.

Your cat's age from
Your cat's date of birth

In human years

e.g. a 6-year-old cat → about 40 human years

The result appears here as you type.

Calculated in your browser. The dates you enter never leave this device.

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How cat years work

Cats don't age at a steady seven years per year. They grow up quickly: the first year counts as about 15 human years, and by their second birthday cats are roughly like a 24-year-old person. After that, each year adds about 4 human years. That's the chart vets commonly use, and the one this calculator follows.

Life stages

The 2021 feline life stage guidelines from the American Animal Hospital Association (AAHA) and the American Association of Feline Practitioners (AAFP) group a cat's life into four stages:

  • Kitten: under 1 year.
  • Young adult: 1 to 6 years.
  • Mature adult: 7 to 10 years.
  • Senior: over 10 years.

Stages matter more than exact numbers: they're how vets decide on check-ups and screening as cats get older.

Cat years to human years chart

Cat ageHuman yearsLife stage
1 year15Young adult
2 years24Young adult
3 years28Young adult
4 years32Young adult
5 years36Young adult
6 years40Young adult
7 years44Mature adult
8 years48Mature adult
9 years52Mature adult
10 years56Mature adult
11 years60Senior
12 years64Senior
13 years68Senior
14 years72Senior
15 years76Senior
16 years80Senior
17 years84Senior
18 years88Senior
19 years92Senior
20 years96Senior

Have a dog too? Try the dog age calculator, which also adjusts for size.

Frequently asked questions

Is one cat year seven human years?

No. Cats grow up fast: a 1-year-old cat is roughly like a 15-year-old person and a 2-year-old like a 24-year-old. After that, each year adds about 4 human years.

How old is a 10-year-old cat in human years?

About 56. A 15-year-old cat is about 76, and a 20-year-old about 96.

When is a cat considered senior?

In the 2021 AAHA/AAFP feline life stage guidelines, cats older than 10 years are seniors. Mature adults are 7 to 10, young adults 1 to 6, and kittens under 1.

What if I don't know my cat's birthday?

Choose Years and months and enter your best estimate. A vet can estimate a cat's age from its teeth, eyes and coat.