Pet Age Calculator
The old “multiply by 7” rule doesn't tell the full story. Dogs and cats age differently depending on their size and breed. This calculator uses veterinary-informed aging curves to give you a more accurate picture.
Select a breed for size-specific calculations. Larger dogs age faster than smaller dogs after their first two years.
In human years, that's approximately
human years old
Based on the American Veterinary Medical Association aging guidelines. The first year of a dog's life equals about 15 human years. After that, aging rate varies by size — larger dogs age faster than smaller dogs.
Frequently Asked Questions
How do you calculate dog years to human years?
The old "7 years per dog year" rule is inaccurate. Modern veterinary science shows that dogs age rapidly in their first two years (about 15 human years in year one, 9 in year two), then aging slows based on size. Large breeds age faster than small breeds after year two.
Do small dogs really live longer than large dogs?
Yes. Small dogs typically live 12-16 years while giant breeds average 7-10 years. This is thought to be because larger dogs age more rapidly at a cellular level and are more prone to age-related diseases like cancer.
How do cat years compare to dog years?
Cats age similarly to small dogs: about 15 human years in the first year, 9 in the second, then roughly 4 human years per calendar year after that. Indoor cats tend to live longer than outdoor cats.