Cat Age Calculator: Cat Years to Human Years
Convert your cat age to human years using the accepted feline aging model.
How cat years work
Cats age fastest early on. The first year equals about 15 human years, the second adds 9 more (so a 2-year-old cat is around 24), and every year after adds about 4 human years. Indoor cats often live 13 to 17 years, sometimes into their 20s.
How to use it
- Enter your cat age in years.
- Press calculate for the human equivalent and life stage.
Cat age chart
| Cat age | Human age |
|---|---|
| 1 | 15 |
| 2 | 24 |
| 5 | 36 |
| 10 | 56 |
| 15 | 76 |
| 20 | 96 |
Life stages
Kitten (0-1 yr)
Rapid growth, vaccinations, socialization.
Young adult (1-6 yrs)
Prime years, focus on weight and dental care.
Mature (7-10 yrs)
Watch for early kidney and thyroid signs.
Senior (11+ yrs)
More frequent vet checks, watch weight, appetite, and litter-box habits.
Why it matters
Cats hide illness well, so knowing your cat is a senior helps you catch kidney disease, thyroid issues, and arthritis earlier. Senior cats benefit from twice-yearly vet visits.
Frequently asked questions
- Is one cat year seven human years?
- No. The first year is about 15 human years, then it slows to roughly 4 per year.
- When is a cat a senior?
- Around 11 years old, though changes can start from 7. Your vet can advise screening.
- How long do cats live?
- Indoor cats commonly live 13 to 17 years, and some reach their early 20s.
- Why do indoor cats live longer?
- They avoid traffic, predators, and many diseases, and get more consistent care.
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General guidance only, not a substitute for professional veterinary advice. For health, dosing, or feeding concerns, consult your vet.