Free Cat Age Calculator
This cat age calculator converts cat years to human years. Enter your cat's age; the answer updates as you type.
Cat age chart: cat years to human years
| Cat age | Human age | Life stage |
|---|---|---|
| 1 | 15 | Young adult |
| 2 | 24 | Young adult |
| 3 | 28 | Young adult |
| 4 | 32 | Young adult |
| 5 | 36 | Young adult |
| 6 | 40 | Young adult |
| 7 | 44 | Mature adult |
| 8 | 48 | Mature adult |
| 9 | 52 | Mature adult |
| 10 | 56 | Senior |
| 11 | 60 | Senior |
| 12 | 64 | Senior |
| 13 | 68 | Senior |
| 14 | 72 | Senior |
| 15 | 76 | Senior |
| 16 | 80 | Senior |
| 17 | 84 | Senior |
| 18 | 88 | Senior |
| 19 | 92 | Senior |
| 20 | 96 | Senior |
How the cat age calculator works
The cat age calculator uses the standard veterinary conversion: a cat reaches about 15 human years at 1, about 24 at 2, then ages about 4 human years every year. Unlike dogs, cats age at much the same rate whatever their size, so it works like a simple cat years calculator.
Feeding by age: use the cat food calculator. Expecting kittens? Try the cat pregnancy calculator.
Frequently asked questions
How does the cat age calculator work?
It uses the standard vet chart: 15 human years for the first year, 24 by the second, then about 4 per year, and shows the AAFP and AAHA life stage.
How do you convert cat years to human years?
The first year of a cat's life equals about 15 human years, the second year brings it to 24, and each year after that adds about 4.
How old is a 10-year-old cat in human years?
About 56 human years, which is the start of the senior stage.
How long do cats live?
Indoor cats commonly live 12 to 18 years, and some reach 20 or more.
What are the cat life stages?
Kitten (up to 1 year), young adult (1–6), mature adult (7–10) and senior (over 10), following the AAFP and AAHA feline life stage guidelines.