How old is a 3 year old cat in human years?
A 3 year old cat is about 28 in human years. By the veterinary life stage guidelines, a cat of 3 is a young adult.
A 3 year old cat
Cat age against human age
The dot marks a 3 year old cat. The line rises fast in the first two years and then evenly.
Cat age chart around 3
| Cat age | Human years | Life stage |
|---|---|---|
| 1 | 15 | Young adult |
| 2 | 24 | Young adult |
| 3 | 28 | Young adult |
| 4 | 32 | Young adult |
| 5 | 36 | Young adult |
After age two each cat year adds 4 human years, so 3 comes to 28 and 4 to 32. A cat of 4 will be still a young adult.
Compared with the old rule
The old rule of seven human years for each cat year would make a 3 year old cat 21. The veterinary chart gives 28, so the old rule is 7 years too low. Cats grow up quickly in their first two years and then age at a steady pace.
Questions
How old is a 3 year old cat in human years?
About 28.
Is a 3 year old cat old?
By the veterinary life stage guidelines, a cat of 3 is a young adult. The stages are kitten until 1 year, young adult from 1 to 6, mature adult from 7 to 10, and senior from 10 years on.
What is 28 human years in cat years?
About 3 cat years. Try the human years to cat years calculator for any age.
Is this exact?
No. Genetics, diet, indoor or outdoor life and health all affect how a cat ages, so treat the result as a general comparison. Ask your vet how often your cat should have checkups.
Other cat ages
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
For any age use the cat years to human years calculator. For dogs see dog years to human years.
Sources
- American Veterinary Medical Association (AVMA), guidance on converting a cat's age to human years (15 for year one, 24 for year two, 4 per year after).
- AAHA/AAFP Feline Life Stage Guidelines, 2021 (kitten, young adult, mature adult and senior age ranges).
Last reviewed 2026-10-26.