How old is your dog
in human years?
Bigger dogs age faster. Smaller dogs live longer. This calculator uses breed-specific size to give you a real answer — not the lazy ×7 myth.
In human years
Based on a -sized breed. Pick a breed for a more accurate estimate.
Why the "1 dog year = 7 human years" rule is wrong
The ×7 rule comes from the rough lifespan ratio between dogs and people, but it ignores the part that matters most: dogs mature very quickly in their first two years, and then ageing slows down — at different rates depending on their size class.
A Chihuahua at 10 years old is roughly 56 human years. A Great Dane at 10 years old is closer to 86. Both started at "15 human years" by age 1, but the giant breed ages almost twice as fast after that.
Pick your dog's breed above for a size-aware estimate, or browse all breeds to see lifespan, when they become "senior", and breed-specific ageing charts.