Dog Age Calculator
Enter your dog's age in years (1 or older) to find the human-equivalent age.
How dog age converts to human years
This calculator uses the formula human age = 16 × ln(dog age) + 31, based on a 2019 comparative study of DNA methylation patterns (epigenetic aging markers) in dogs and humans — a more scientifically grounded alternative to the old "multiply by 7" rule.
The logarithmic shape reflects how dogs age very rapidly in their first couple of years (reaching rough human adulthood by around age 2-3) and then age more gradually afterward, rather than at a constant linear rate throughout their life.
Frequently asked questions
Why isn't 1 dog year just equal to 7 human years?
The flat 7:1 ratio doesn't match real aging patterns — dogs mature to roughly human adulthood within their first 2-3 years, far faster than a linear 7x rate would suggest, then age more gradually afterward.
Does this formula account for breed size differences?
No — this is a general average formula from the referenced study. In reality, smaller breeds tend to live longer and age more slowly in later years compared to larger breeds, which this simplified formula doesn't capture.
Is this calculator meant for veterinary or health decisions?
No — this is for general interest only. Consult a veterinarian for any health or care decisions regarding your dog's age-related needs.