It's one of the most common questions cat owners ask, and the answer is a little more interesting than "multiply by seven." Here's the quick formula, a full cat age chart, and a simple way to work out your own cat's human-equivalent age in seconds.
The Quick Answer
Veterinary guidance converts cat years to human years like this:
- 1 year old ≈ 15 human years
- 2 years old ≈ 24 human years
- Every year after that adds about 4 human years
So a 3-year-old cat is roughly 28 in human terms, a 7-year-old is about 44, and a 12-year-old is around 64.
Cat Age Chart: Cat Years to Human Years
| Cat's age | Human age (approx.) | Life stage |
|---|---|---|
| 1 year | 15 | Junior |
| 2 years | 24 | Prime |
| 3 years | 28 | Prime |
| 4 years | 32 | Prime |
| 5 years | 36 | Prime |
| 6 years | 40 | Mature |
| 7 years | 44 | Mature |
| 8 years | 48 | Mature |
| 9 years | 52 | Mature |
| 10 years | 56 | Senior |
| 11 years | 60 | Senior |
| 12 years | 64 | Senior |
| 13 years | 68 | Senior |
| 14 years | 72 | Geriatric |
| 15 years | 76 | Geriatric |
| 16 years | 80 | Geriatric |
| 17 years | 84 | Geriatric |
| 18 years | 88 | Geriatric |
| 19 years | 92 | Geriatric |
| 20 years | 96 | Geriatric |
Life stage boundaries are approximate. Every cat ages a little differently, so treat the stage as a guide rather than a hard cutoff.
How to Work It Out Yourself
For any cat older than two, start at 24 and add 4 for every year beyond the second. For example, a 9-year-old cat is 24 + (7 × 4) = 52 in human years. A 15-year-old cat is 24 + (13 × 4) = 76.
What About Kittens Under One Year?
Kittens grow up remarkably fast, so a flat conversion doesn't really work for the first year. As a rough guide, a 1-month-old kitten is comparable to a human infant of about a year, a 3-month-old to a 4-year-old child, a 6-month-old to a 10-year-old, and a 12-month-old to a 15-year-old teenager. These figures are approximate, but they show how much development is packed into a cat's first twelve months.
Why Not Just Multiply by Seven?
The old "×7" rule treats cat aging as a straight line, but real aging isn't linear. Cats reach physical maturity within their first year or two, then age more slowly. Multiplying by seven overstates the age of an adult cat, and the error grows with each birthday. A 10-year-old cat is about 56 in human terms, not 70. For a fuller explanation, read how cats actually age.
What If I Don't Know My Cat's Exact Age?
This is common with rescue and stray cats. A vet can usually estimate age from the teeth, eyes, coat, and muscle tone. Young cats have clean, bright teeth and clear eyes, while older cats often show dental wear, tartar, and a duller or thinner coat. It won't be exact, but a rough age range is enough to use the chart above and to guide your cat's care.
Does Breed Change the Answer?
The formula is a solid starting point for any cat, but breed can affect how long a cat lives and which health conditions to watch for. If you have a specific breed, take a look at our guides to the Maine Coon, Siamese, Ragdoll, and Persian lifespan.
Try the Calculator
Want the answer without doing any math? Use the calculator to get your cat's human-age equivalent, see which life stage they're in, and read a short note on what tends to matter most at that stage.
This chart reflects general veterinary consensus on feline aging and is intended as an educational starting point, not a substitute for advice from your cat's own veterinarian.