Cat age calculator
Convert your cat’s age using the reference veterinary scale.
- Instant
- Free
- Private (processed locally)
- No sign-up
Understand your cat’s real age
An “adult” cat of 5 already equals 36 human years. This tool applies the veterinary scale and also shows the life stage, useful to adapt diet and check-ups.
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Enter the cat’s age
In years (half-years accepted).
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Read the human equivalent
Computed with the veterinary scale.
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Spot the life stage
Kitten, junior, adult, mature, senior, geriatric.
A few equivalents
| Cat age | Human age | Stage |
|---|---|---|
| 1 yr | 15 | Junior |
| 2 yr | 24 | Junior |
| 5 yr | 36 | Adult |
| 10 yr | 56 | Mature |
| 15 yr | 76 | Geriatric |
Basis: 1 yr ≈ 15, 2 yr ≈ 24, then +4 per year. These are averages; your vet is the reference.
Frequently asked questions
How does the feline scale work?
A cat’s first year equals about 15 human years, the second brings the total to 24, then each additional year adds about 4 human years. So a 5-year-old cat equals 36, and a 10-year-old cat equals 56.
Why do the first years count so much?
A kitten reaches maturity very fast: at 1 year it is already a young adult. That is why the first year “counts” as 15 human years and the second adds 9 more. After 2 years the pace settles at +4 years per year.
What do the life stages mean?
Vets distinguish: kitten (0-6 months), junior (up to ~2 years), adult (3-6 years), mature (7-10 years), senior (11-14 years) and geriatric (15+). These stages guide health monitoring and diet.
Does an indoor cat live longer?
Generally yes: indoor cats often live 12 to 18 years, sometimes over 20, far more than outdoor cats more exposed to accidents and disease. The scale applies regardless of lifestyle.