Dog Age Calculator
Convert your dog's age to human years, adjusted for size.
Dog Age Calculator
Your Result
Why the Old "x7" Rule Is Wrong
The popular "multiply by 7" rule is a myth, dogs mature much faster than humans in their first two years, then age more slowly afterward, and the rate also depends heavily on the dog's adult size. Larger breeds tend to age faster in their later years than small breeds.
This calculator uses a size-adjusted aging curve: dogs age rapidly in year one (roughly equivalent to 15 human years), moderately in year two, and then at a size-dependent rate each year after that.
Frequently Asked Questions
Why does my dog's size matter for aging?
Larger dog breeds generally have shorter lifespans and tend to age faster in their later years compared to smaller breeds, which is why size-adjusted formulas are more accurate than a flat multiplier.
Is 1 dog year really 7 human years?
No, that's an oversimplified myth. Dogs age much faster than that in their first two years and then slow down, the actual rate varies by breed size.
How accurate is this calculator?
It uses a commonly cited size-adjusted aging model as a reasonable estimate, but individual dogs, especially with different genetics and health, can age at different rates.