How old is a dog in human years?

The first year counts as 15 human years and the second as 9 more, so a 2-year-old dog is 24. After that each dog year adds 4 to 7 human years depending on size: 4 for small dogs, 5 for medium, 6 for large and 7 for giant breeds.

How old is a cat in human years?

The first year counts as 15 human years and the second as 9 more, so a 2-year-old cat is 24. After that each cat year adds 4, so a 15-year-old cat is about 76.

Is one dog year really 7 human years?

No. That rule is a rough average. Dogs grow up fast in year one, then age at a pace that depends on their size, and large dogs age faster than small ones.

Dog and Cat Age Calculator

Find out how old your dog or cat is in human years. Free.

How the calculator works

The first year of a dog or cat counts as 15 human years. The second year adds 9, so a 2-year-old is 24. After that a cat adds 4 human years per year, and a dog adds 4, 5, 6 or 7 depending on size: small, medium, large or giant.

Dog and cat age in human years

Pet age	Cat	Small dog	Large dog
1 year	15	15	15
2 years	24	24	24
5 years	36	36	42
10 years	56	56	72
15 years	76	76	102

Is one dog year 7 human years?

No. Seven is a rough average. Dogs grow up fast in year one, and big dogs age faster than small ones, so a 10-year-old Lab is older in human years than a 10-year-old Chihuahua.