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Cat years to human years
A 1-year-old cat is about 15 in human years, a 2-year-old about 24, and each year after that adds about 4. Enter your cat's age, or find it in the chart below.
Your cat's age in human years will show here.
Age comparisons are approximate. Last reviewed October 7, 2026.
Cat years to human years chart
Values from International Cat Care, with its life stage for each age.
Kittens and young cats
| Cat age | Human years | Life stage |
|---|---|---|
| 1 month | 1 | Kitten |
| 2 months | 2 | Kitten |
| 3 months | 4 | Kitten |
| 4 months | 6 | Kitten |
| 5 months | 8 | Kitten |
| 6 months | 10 | Kitten |
| 7 months | 12 | Junior |
| 1 year | 15 | Junior |
| 18 months | 21 | Junior |
| 2 years | 24 | Junior |
Adult and senior cats
| Cat age | Human years | Life stage |
|---|---|---|
| 3 years | 28 | Adult |
| 4 years | 32 | Adult |
| 5 years | 36 | Adult |
| 6 years | 40 | Adult |
| 7 years | 44 | Mature |
| 8 years | 48 | Mature |
| 9 years | 52 | Mature |
| 10 years | 56 | Mature |
| 11 years | 60 | Senior |
| 12 years | 64 | Senior |
| 13 years | 68 | Senior |
| 14 years | 72 | Senior |
| 15 years | 76 | Super senior |
| 16 years | 80 | Super senior |
| 17 years | 84 | Super senior |
| 18 years | 88 | Super senior |
| 19 years | 92 | Super senior |
| 20 years | 96 | Super senior |
| 21 years | 100 | Super senior |
| 22 years | 104 | Super senior |
| 23 years | 108 | Super senior |
| 24 years | 112 | Super senior |
| 25 years | 116 | Super senior |
How the conversion works
Cats mature very quickly. By 6 months a kitten is roughly like a 10-year-old child, and by its first birthday it is about as grown up as a 15-year-old. In International Cat Care's words, the first two years "equate to 24 human years", and each year after that equals about 4.
For cats 2 years and older: human years = 24 + 4 × (cat age − 2). A 10-year-old cat is about 56, and a 15-year-old is about 76.
The old "multiply by 7" rule doesn't work for cats. It makes young cats far too young and old cats far too old.
Cat life stages
International Cat Care uses six stages: kitten (0–6 months), junior (7 months–2 years), adult (3–6 years), mature (7–10 years), senior (11–14 years) and super senior (15 years and up). Vets in North America often use the 2021 AAHA/AAFP Feline Life Stage Guidelines instead: kitten (up to 1 year), young adult (1–6 years), mature adult (7–10 years) and senior (over 10 years).
Life stage matters more than the human-year number: it decides how often your cat should see the vet and which food fits. For a calculator that also converts human years back to cat years, use the cat age calculator.
Questions people ask
How old is a 1-year-old cat in human years?
About 15. Cats grow up fast in their first year, so a 1-year-old cat is roughly like a teenager.
How old is a 10-year-old cat in human years?
About 56. After age 2, each cat year adds about 4 human years.
How old is a 15-year-old cat in human years?
About 76, which puts the cat in the super senior stage.
Is one cat year equal to 7 human years?
No. The first year is about 15 human years and the second about 9 more. After that, each cat year is about 4 human years.
How old is a 20-year-old cat in human years?
About 96. International Cat Care's chart runs to 25 cat years, which is about 116 in human years.