Cat years to human years chart

A 1-year-old cat is 15 in human years, a 2-year-old is 24, and every year after adds 4: 44 at 7, 76 at 15 and 116 at 25. Pick an age for the full answer.

Cat age in human years, 1 to 25

From International Cat Care’s chart. The AVMA chart lists the same values for ages 1 to 16.

Cat ageHuman yearsInternational Cat Care stageAAHA/AAFP stage
1 year15JuniorYoung adult
2 years24JuniorYoung adult
3 years28AdultYoung adult
4 years32AdultYoung adult
5 years36AdultYoung adult
6 years40AdultYoung adult
7 years44MatureMature adult
8 years48MatureMature adult
9 years52MatureMature adult
10 years56MatureMature adult
11 years60SeniorSenior
12 years64SeniorSenior
13 years68SeniorSenior
14 years72SeniorSenior
15 years76Super seniorSenior
16 years80Super seniorSenior
17 years84Super seniorSenior
18 years88Super seniorSenior
19 years92Super seniorSenior
20 years96Super seniorSenior
21 years100Super seniorSenior
22 years104Super seniorSenior
23 years108Super seniorSenior
24 years112Super seniorSenior
25 years116Super seniorSenior

Kittens under a year

The rows International Cat Care lists for the first months.

Kitten ageHuman yearsStage
0–1 month0–1Kitten
2 months2Kitten
3 months4Kitten
4 months6Kitten
5 months8Kitten
6 months10Kitten
7 months12Junior
18 months21Junior

A kitten gains about 2 human years a month until 7 months, when it is about 12. Growth then slows: 15 at a year, 21 at 18 months and 24 at 2 years.

Sources

Every number on this page comes from these, checked October 2, 2026. Human-age equivalents are estimates, not veterinary advice.

  1. International Cat Care, “How to tell your cat’s age in human years.” The cat age chart (to 25 years) and its six life stages.
  2. 2021 AAHA/AAFP Feline Life Stage Guidelines. Kitten up to 1 year, young adult 1 to 6, mature adult 7 to 10, senior over 10.
  3. AVMA, “Pets age faster than people” (PDF). Dog column for a medium-size dog of 21 to 50 lb, ages 1 to 16; cat column, ages 1 to 16. AVMA adds that pet ages are approximate and that weight and breed may influence aging.
  4. AVMA, “Caring for senior cats and dogs.” Dog size groups by weight, the age each group becomes senior, cats senior after about 10, and the statement that dogs don’t age 7 human years per year.

More age tools

Cat age calculatorYears and months, with life stage, on a vet record card. Dog years chartEvery dog age from 1 to 20 with both methods.