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Cat Age Calculator: Cat Years to Human Years

Enter your cat's age in years and months to see the human-equivalent age and life stage. The numbers come from the International Cat Care chart; the vet life stage comes from the 2021 AAHA/AAFP Feline Life Stage Guidelines.

Checked against 2 sources· Not veterinary advice

Your cat's age

In human years, your cat is about

28 human years

International Cat Care stage
Adult
AAHA/AAFP vet life stage
Young adult

How the calculator works

International Cat Care publishes a chart that matches a cat's age to a human age. Cats grow up fast: the first two years equal 24 human years, and each year after that equals 4 human years. The calculator uses the chart's values exactly where your cat's age is a row on the chart. For ages between rows (say 8 months, or 4 years and 6 months), it takes the proportional point between the two nearest rows, so the result moves smoothly from one row to the next. Past 25 years it carries on at 4 human years per cat year.

How to read the life stage

You will see two life stages, because the two main schemes divide a cat's life differently:

  • International Cat Care (six stages): kitten (0 to 6 months), junior (7 months to 2 years), adult (3 to 6 years), mature (7 to 10 years), senior (11 to 14 years) and super senior (15 years and over).
  • 2021 AAHA/AAFP Feline Life Stage Guidelines (for vets): kitten (birth to 1 year), young adult (1 to 6 years), mature adult (7 to 10 years) and senior (10 years and older), plus an end-of-life stage that can come at any age. These guidelines replaced an earlier six-stage scheme. The calculator counts a cat as senior from its 10th birthday.

The cat age chart

The full International Cat Care chart, row for row:

Life stageCat's ageHuman age
Kitten0–1 month0–1 year
Kitten2 months2 years
Kitten3 months4 years
Kitten4 months6 years
Kitten5 months8 years
Kitten6 months10 years
Junior7 months12 years
Junior12 months15 years
Junior18 months21 years
Junior2 years24 years
Adult3 years28 years
Adult4 years32 years
Adult5 years36 years
Adult6 years40 years
Mature7 years44 years
Mature8 years48 years
Mature9 years52 years
Mature10 years56 years
Senior11 years60 years
Senior12 years64 years
Senior13 years68 years
Senior14 years72 years
Super Senior15 years76 years
Super Senior16 years80 years
Super Senior17 years84 years
Super Senior18 years88 years
Super Senior19 years92 years
Super Senior20 years96 years
Super Senior21 years100 years
Super Senior22 years104 years
Super Senior23 years108 years
Super Senior24 years112 years
Super Senior25 years116 years

Frequently asked questions

How old is a 1 year old cat in human years?

About 15. On the International Cat Care chart a 12-month-old cat equals a 15-year-old person, and a 2-year-old cat equals 24.

How do you convert cat years to human years?

International Cat Care's rule is that the first two years of a cat's life equal 24 human years, and every year after that equals 4 human years. So a 10-year-old cat is about 24 + 8 × 4 = 56.

Is a 7 year old cat old?

A 7-year-old cat is in the mature stage (7 to 10 years) on both the International Cat Care chart and the 2021 AAHA/AAFP guidelines. International Cat Care compares mature cats to people in their mid-40s to mid-50s.

At what age is a cat a senior?

It depends on the scheme. The 2021 AAHA/AAFP Feline Life Stage Guidelines call cats senior from 10 years. International Cat Care uses senior for 11 to 14 years and super senior for 15 years and over.

How long do cats live?

International Cat Care says cats live on average around 12 to 14 years, and it is not unusual for some to reach their late teens or early twenties.

Sources

  1. How to tell your cat's age in human years, International Cat Care. Used for: Life stages and the cat-to-human age table.
  2. 2021 AAHA/AAFP Feline Life Stage Guidelines, American Association of Feline Practitioners (AAFP) and AAHA. Used for: Veterinary life stages: kitten, young adult, mature adult, senior.