How old is your dog, really?
This calculator uses the epigenetic formula from a 2019 UC San Diego study — the same DNA-methylation method scientists use to age human cells. Far more accurate than the "multiply by 7" myth.
The science
Wang et al. (2019, Cell Systems) analyzed DNA methylation patterns in 104 Labradors and found that dog-to-human age conversion follows the formula:
human_age = 16 × ln(dog_age) + 31
Dogs mature very quickly in their first year, then aging slows dramatically. We additionally adjust for breed size, since smaller dogs live ~30% longer than giants.