Cat Age Chart (Cat Years to Human Years)
Free cat age chart converting cat years to human years with the vet method: year 1 = 15, year 2 = 24, then +4 each year. See your cat's human age and life stage.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
| Cat age | Human years | Life stage |
|---|
How the Cat Age Chart Works
This cat age chart converts your cat’s age into human years using the method recommended by veterinarians. Enter your cat’s age, and the tool shows its human-equivalent age, its life stage, and a full reference chart with your cat’s row highlighted.
The Vet Method
Year 1 = 15 human years Year 2 = +9 (24 human years total) Each year after = +4 human years
Cats develop very quickly early on, then settle into a steadier 4-years-per-year pace. This is far more accurate than multiplying a cat’s age by 7.
Cat Years to Human Years Chart
| Cat age | Human years | Life stage |
|---|---|---|
| 0.5 | 8 | Kitten |
| 1 | 15 | Junior |
| 2 | 24 | Junior |
| 4 | 32 | Prime adult |
| 6 | 40 | Prime adult |
| 8 | 48 | Mature |
| 10 | 56 | Mature |
| 14 | 72 | Senior |
| 18 | 88 | Geriatric |
| 20 | 96 | Geriatric |
How to Use It
- Enter your cat’s age in years (half-years are fine, e.g. 0.5 for a kitten).
- Read the human-year estimate and life stage instantly.
- Scan the full chart — the row closest to your cat’s age is highlighted.
Cat Life Stages
- Kitten (under 6 months) — fast growth, vaccinations and socialisation.
- Junior (6 months–2 years) — reaching full size and energy.
- Prime adult (3–6 years) — healthy peak years.
- Mature (7–10 years) — begin senior wellness monitoring.
- Senior (11–14 years) — twice-yearly vet checks help.
- Geriatric (15+ years) — extra care for kidneys, joints and teeth.
These figures are estimates. Breed, weight, diet and whether your cat lives indoors all influence how it ages, so use the chart as a friendly guide and rely on your vet for health decisions.
Frequently asked questions
How do you convert cat years to human years?+
Vets use this method: a cat's first year equals about 15 human years, the second year adds 9 more for 24 total, and every year after that adds 4 human years. So a 6-year-old cat is roughly 24 + 4 x 4 = 40 human years.
How old is a 10-year-old cat in human years?+
A 10-year-old cat is about 56 human years (24 from the first two years, plus 4 for each of the next 8). That places it in the mature-to-senior range, where annual or twice-yearly vet checks are recommended.
Why do cats age so fast in the first two years?+
Cats reach reproductive maturity and near-adult size within their first year, so they pack a lot of development into a short time. That is why year one equals about 15 human years and year two reaches 24 before the pace slows to 4 per year.
When is a cat considered a senior?+
Most vets classify cats as mature from about 7 years, senior from 11, and geriatric from 15. Senior and geriatric cats benefit from more frequent check-ups, dental care and monitoring for kidney and thyroid issues.
Do indoor and outdoor cats age differently?+
The conversion math is the same, but indoor cats often live longer on average because they face fewer accidents and diseases. Lifespan still depends on genetics, diet, weight and veterinary care for both indoor and outdoor cats.