Dog Age Calculator
Translate your dog's age into human years with modern DNA-based and traditional methods — adjusted for breed size.
Two Methods, One Truth
The modern method (Wang 2020) uses DNA methylation data. The traditional method counts the first year as 15, second as 9, and 5 per year after — adjusted for size. Both are shown.
Frequently Asked Questions
Is 1 dog year really 7 human years?
No — that old rule is a myth. Dogs age fast early in life (a 1-year-old dog is like a 15-year-old human) then slow down. Size also matters hugely.
What's the Wang 2020 formula?
A 2020 UC San Diego study used DNA methylation patterns: human age ≈ 16 × ln(dog age) + 31. More accurate than the old 7× rule.
Why does size affect dog aging?
Large breeds age faster than small ones. A Great Dane at 7 is roughly equivalent to a human in their 60s, while a Chihuahua at 7 is more like mid-40s.
What's the oldest dog age?
Most dogs live 10–13 years. Small breeds often reach 15+. The verified record is 29 years (an Australian Cattle Dog named Bluey).