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About the cat age calculator
Cats grow up incredibly fast. By its first birthday a cat is like a 15-year-old teenager, and at two it is like a 24-year-old adult. After that, each cat year counts as about 4 human years.
Enter your cat's age in years and months to see how old it is in human years and which life stage it is in: kitten, young adult, adult or senior.
How to use it
- Type your cat's age in years and months
- Read the age in human years and the life stage
Cat age chart
| Cat age | Human years |
|---|---|
| 6 months | 8 |
| 1 year | 15 |
| 2 years | 24 |
| 3 years | 28 |
| 5 years | 36 |
| 7 years | 44 |
| 10 years | 56 |
| 12 years | 64 |
| 15 years | 76 |
| 18 years | 88 |
| 20 years | 96 |
How it is worked out
- First year: 15 human years
- Second year: 9 more (24 in total)
- Every year after that: about 4 human years
Unlike dogs, cats of all sizes age at about the same speed.
Cat life stages
| Stage | Cat age | Human age |
|---|---|---|
| Kitten | up to 1 year | up to 15 |
| Young adult | 1–3 years | 15–28 |
| Adult | 3–11 years | 28–60 |
| Senior | 11 years and older | 60 and older |
Indoor cats often live 12–18 years, and many reach 20.
Frequently asked questions
How old is a 10-year-old cat in human years?
About 56 human years — a mature adult, close to the senior years.
Is one cat year seven human years?
No. Cats age much faster at first (15 human years in the first year) and slower later (about 4 per year).
When is a cat a senior?
From about 11 years. Older cats benefit from regular vet check-ups, a warm place to sleep and food made for seniors.
How long do cats live?
Indoor cats commonly live 12–18 years; outdoor cats usually less. Good food, vet care and staying indoors all help.
Is this a medical tool?
No. It is a fun guide based on common charts. For your cat's health, ask your vet.
Good to know
- Your cat's age is saved in this browser
- For dogs, use the Dog Age Calculator — size matters for them
- Nothing you type is sent anywhere
Related tools
- Dog Age Calculator — dog years by size
- Age Calculator — your own exact age
- Date Calculator — days between dates
- Countdown to Date — count down to a birthday
- Spin the Wheel — pick a name for a new kitten
