A 1-year-old cat is about
15
in human years
Reaching full size and full of energy. Behaviour is still adolescent.
A cat aged 1 year is in the junior life stage (7 months–2 years). Reaching full size and full of energy. Behaviour is still adolescent.
The first year of a cat's life counts as about 15 human years. That puts a 1-year-old cat at about 15 in human years.
Cats don't age in whole-year jumps. Here is how the human equivalent grows over the year between 1 and 2.
| Cat's age | Human years |
|---|---|
| 1 year | 15 |
| 1 year 1 month | 16 |
| 1 year 2 months | 17 |
| 1 year 3 months | 17 |
| 1 year 4 months | 18 |
| 1 year 5 months | 19 |
| 1 year 6 months | 20 |
| 1 year 7 months | 20 |
| 1 year 8 months | 21 |
| 1 year 9 months | 22 |
| 1 year 10 months | 23 |
| 1 year 11 months | 23 |
Cats and dogs start out the same, but dogs age faster as they grow, and larger dogs age fastest.
| At 1 year | Human years | Life stage |
|---|---|---|
| Cat | 15 | Junior |
| Small dog | 15 | Young adult |
| Medium dog | 15 | Young adult |
| Large dog | 15 | Young adult |
| Giant dog | 15 | Young adult |
Dog size
No. A cat this age is in the junior stage, roughly a teenager or young adult in human terms.
At this age, about 15. The first year of a cat's life counts as about 15 human years.
The formula doesn't account for breed, health, or lifestyle, so treat the result as a guide. Indoor cats commonly live into their mid-to-late teens.
See the full cat years to human years chart, or compare with a 1-year-old dog.