Cat Years to Human Years Chart
Short answer: 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 human years. So a 10-year-old cat is about 56 and a 15-year-old about 76.
The formula
2 years = 24 human years
After 2: human years = 24 + 4 × (cat age − 2)
Cat age chart
| Cat age | Human years | Cat age | Human years |
|---|---|---|---|
| 3 months | 4 | 13 | 68 |
| 6 months | 10 | 14 | 72 |
| 1 | 15 | 15 | 76 |
| 2 | 24 | 16 | 80 |
| 3 | 28 | 17 | 84 |
| 4 | 32 | 18 | 88 |
| 5 | 36 | 19 | 92 |
| 6 | 40 | 20 | 96 |
| 7 | 44 | 21 | 100 |
| 8 | 48 | 22 | 104 |
| 9 | 52 | 23 | 108 |
| 10 | 56 | 24 | 112 |
| 11 | 60 | 25 | 116 |
| 12 | 64 |
Cat life stages
| Stage | Cat age | Human years |
|---|---|---|
| Kitten | 0-1 | 0-15 |
| Young adult | 1-6 | 15-40 |
| Mature adult | 7-10 | 44-56 |
| Senior | over 10 | over 56 |
These are the stages in the 2021 AAHA/AAFP Feline Life Stage Guidelines. Seniors should see the vet every 6 months, with blood and urine tests to catch kidney disease, thyroid problems and diabetes early.
Why the 7 year rule is wrong for cats
A 1-year-old cat is sexually mature and nearly full size, much more like a teenager than a 7-year-old child. After the second year, cats age about 4 human years per year, so the 7 year rule overstates the age of older cats.
Wondering how long your cat may live? See how long do cats live.
Sources: 2021 AAHA/AAFP Feline Life Stage Guidelines; American Association of Feline Practitioners age chart.
Try the cat age calculator
Enter your own numbers below, or open the full cat age calculator with the formula and more examples.
This guide is general information, not veterinary advice. Your pet may differ: ask your vet. Terms
Frequently asked questions
How old is a 10 year old cat in human years?
About 56.
How old is a 15 year old cat in human years?
About 76.
How old is a 20 year old cat in human years?
About 96.
At what age is a cat a senior?
From about 10 years, according to the AAHA/AAFP life stage guidelines.