PawsMathHow cat years convert to human years
Kittens grow up astonishingly fast. By 6 months a cat can reproduce, and by its first birthday it is roughly equivalent to a 15-year-old person. The second year brings the cat to about 24 human years. From then on, ageing slows to roughly 4 human years for each cat year. Unlike dogs, cats vary little in size, so the same conversion works for nearly all breeds.
Cat age chart
| Cat age | Human age | Cat age | Human age |
|---|---|---|---|
| 1 | 15 | 11 | 60 |
| 2 | 24 | 12 | 64 |
| 3 | 28 | 13 | 68 |
| 4 | 32 | 14 | 72 |
| 5 | 36 | 15 | 76 |
| 6 | 40 | 16 | 80 |
| 7 | 44 | 17 | 84 |
| 8 | 48 | 18 | 88 |
| 9 | 52 | 19 | 92 |
| 10 | 56 | 20 | 96 |
Feline life stages
The American Animal Hospital Association and American Association of Feline Practitioners define four stages:
- Kitten (birth – 1 year): rapid growth; vaccinations, neutering and socialisation.
- Young adult (1 – 6 years): peak health; annual check-ups and dental care.
- Mature adult (7 – 10 years): watch weight and teeth; early screening tests are worthwhile.
- Senior (over 10 years): higher risk of kidney disease, hyperthyroidism, diabetes and arthritis; vet visits every 6 months.
Keeping an older cat healthy
- Watch for changes in thirst, appetite, weight, litter box habits and grooming. These are often the first signs of illness.
- Encourage drinking with fountains and wet food; see how to get your cat to drink more.
- Provide low-sided litter boxes, ramps or steps to favourite spots for stiff joints.
- Adjust food portions as activity changes. The cat food calculator can help.
More questions
How old is my cat in human years?
A cat’s first year equals about 15 human years and the second year adds about 9 more, so a 2-year-old cat is roughly 24. After that each cat year equals about 4 human years. A 10-year-old cat is about 56 in human terms.
At what age is a cat considered senior?
The AAHA/AAFP feline life stage guidelines call cats seniors from about 10 years of age. Many vets recommend twice-yearly check-ups and routine blood and urine tests from this point.
How long do indoor cats live?
Indoor cats commonly live 12–18 years, and many reach their twenties. Outdoor cats have shorter average lifespans because of traffic, fights, predators and infectious disease.
What is the oldest cat on record?
Creme Puff, a cat from Austin, Texas, is recognised by Guinness World Records as the oldest cat ever, living to 38 years and 3 days, or around 168 in human years using the standard conversion.
How can I tell how old a cat is?
For cats of unknown age, vets look at teeth (adult teeth by 6 months, tartar and wear increase with age), eye clarity, coat condition and muscle tone. These give a rough range rather than an exact age.
Sources
- 2021 AAHA/AAFP Feline Life Stage Guidelines, American Animal Hospital Association
- Oldest cat ever, Guinness World Records
A calculator can't examine your cat. If anything seems off, or you're unsure, your veterinarian is the right person to ask. Disclaimer