Cat years made simple
Cat Years to Human Years Calculator
Most cats are about 15 human years old by their first birthday, about 24 by their second birthday, and then age about 4 human years for each cat year after that.
Add your cat's birthdate to see the estimate and birthday details.
Add a birthdate for a playful cat personality note.
Choose a breed or cat type for a playful note.
Cat years to human years
A cat's first year is roughly equal to 15 human years. A 2 year old cat is about 24 in human years. After that, each cat year adds about 4 human years.
The old seven-year rule does not work well for cats. Kittens grow up fast, then the pace becomes steadier through the adult and senior years.
Most common cat ages in human years
| Cat age | Estimated human age | Life stage | Age page |
|---|---|---|---|
| 1 year old | 15 human years | Young adult | 1 year old cat |
| 2 years old | 24 human years | Young adult | 2 year old cat |
| 5 years old | 36 human years | Young adult | 5 year old cat |
| 6 years old | 40 human years | Young adult | 6 year old cat |
| 7 years old | 44 human years | Mature adult | 7 year old cat |
| 10 years old | 56 human years | Mature adult | 10 year old cat |
| 13 years old | 68 human years | Senior | 13 year old cat |
| 15 years old | 76 human years | Super senior | 15 year old cat |
| 20 years old | 96 human years | Super senior | 20 year old cat |
| 21 years old | 100 human years | Super senior | 21 year old cat |
| 24 years old | 112 human years | Super senior | 24 year old cat |
Kitten months in human years
Kitten ages are easier to understand by month because the first year changes so quickly.
| Kitten age | Estimated human age | Age page |
|---|---|---|
| 2 months old | 2.5 human years | 2 month old kitten |
| 4 months old | 5 human years | 4 month old kitten |
| 5 months old | 6.3 human years | 5 month old kitten |
| 6 months old | 7.5 human years | 6 month old kitten |
| 12 months old | 15 human years | 12 month old kitten |
Older cat ages
A 10 year old cat is about 56 in human years and close to the senior stage.
A 13 year old cat is about 68 in human years. Many cats this age still enjoy play, routine, and attention.
A 15 year old cat is about 76 in human years and usually in the super senior stage.
A 20 year old cat is about 96 in human years. That is a remarkable age for a cat.
Find your cat's exact age
Monthly guides from 1 month to 12 months old.
Yearly guides from 1 to 25 years old.
All kitten and cat ages in one table.
Find the cat breed that matches your personality.
A friendly estimate
The calculator is for general understanding. If your kitten is very young, your cat is older, or you notice changes in appetite, weight, litter box habits, grooming, movement, or behavior, a veterinarian is the right person to ask.
Common questions
How do you convert cat years to human years?
A common estimate counts the first cat year as about 15 human years, the second cat year as about 24 human years total, and each cat year after that as about 4 human years.
How old is my cat in human years?
Enter your cat's birthday in the calculator for a personalized estimate. If you only know the age by year, use the table or the full cat age chart.
Is one cat year seven human years?
No. The seven-year rule is too simple because cats grow fastest during the first two years, then age more steadily after that.
How old is a kitten in human years?
A kitten's human-age estimate depends on the month. A 6 month old kitten is about 7.5 human years old, while a 12 month old cat is about 15.
When is a cat considered senior?
On this site, cats move into the senior stage around age 11 and the super senior stage around age 15. Some veterinary life-stage systems use slightly different ranges.