PuppyweeksFree tool
Your dog’s age in human years
Enter your dog’s age. We’ll convert it using the science-based epigenetic formula — 16 × ln(age) + 31 — from a 2020 UC San Diego study, not the old “multiply by 7” myth. Nothing is saved or sent anywhere.
In human years
years
Still a young puppy
The human-years formula is calibrated for dogs from about 8 weeks old. Younger than that, developmental stage is a better lens than a “human age.”
Try the Puppy Stage Finder →Enter an age above to convert it.
Formula from Wang et al., Cell Systems (2020). See our sources.
Common questions
How do you calculate a dog’s age in human years?
This tool uses the formula human age = 16 × ln(dog age in years) + 31, published by Wang and colleagues in Cell Systems (2020). It’s based on DNA-methylation “epigenetic clocks” shared between dogs and humans, so it reflects how dogs actually age — fast early on, then slowing down.
Is the “multiply by 7” rule accurate?
No. The 1-dog-year-equals-7-human-years rule has no scientific basis. Dogs mature much faster than 7× in their first two years and slower after, which is why a logarithmic formula fits real aging far better.
Does this work for young puppies?
The formula is calibrated for dogs from roughly 8 weeks of age. For younger puppies, a “human years” number isn’t very meaningful — what your puppy is going through developmentally is. Use the Puppy Stage Finder for that.
Does breed or size change how a dog ages?
Somewhat. The published formula was derived from Labrador Retrievers, so treat it as a well-grounded approximation rather than an exact figure — smaller breeds tend to live longer and larger breeds shorter, which shifts the later years.