Dog and Cat Age Calculator
Convert your dog’s or cat’s age to human years, using the size of the dog for a better estimate.
- Human age
- about 39 years
- Per year after age 2
- 5 human years
What is Dog and Cat Age Calculator?
The old rule that one dog year equals seven human years is too simple. Pets age fastest in their first two years, and large dogs age faster than small ones.
What this tool does
Counts the first year as about 15 human years and the second as about 9 more. After that each year adds about 4 human years for cats and small dogs, 5 for medium dogs, 6 for large dogs and 7 for giant dogs.
How to use it
- Choose a dog or a cat.
- For a dog, choose the size.
- Enter the age and read the human equivalent.
Did you know?
- This is a rough guide. Breed, health and lifestyle all change how a pet ages.
- Small dogs often live 14 years or more, while giant breeds often live 8 to 10 years.