Human age to cat age table
| Human age | Cat age |
|---|---|
| 10 | 6 months |
| 15 | 1 year |
| 21 | 1½ years |
| 24 | 2 years |
| 30 | 3½ years |
| 40 | 6 years |
| 50 | 8½ years |
| 60 | 11 years |
| 70 | 13½ years |
| 80 | 16 years |
| 90 | 18½ years |
| 100 | 21 years |
The formula
For any human age of 24 or older: cat age = 2 + (human age − 24) ÷ 4. Under 24, the cat is still in its first two years, when it ages very fast. The calculator handles those months for you.
Frequently asked questions
How old am I in cat years?
Subtract 24 from your age, divide by 4, then add 2. A 40-year-old is about 6 in cat years. Anyone under 24 is a cat under 2.
How many cat years is 1 human year?
For an adult cat, one calendar year adds about 4 human-equivalent years. In the first year of life, one calendar year equals about 15.