How Old Is My Dog in Human Years?
Dog to Human Age Calculator
Enter your dog's name and age in years to find out the equivalent human age.
Ever wondered how old your dog is in human years? Try our calculator to get a fair idea of your pal's age if they were human. You might as well check it out since they probably act human too!
Why "multiply by 7" is a myth
The old rule of one dog year equalling seven human years assumes dogs age at a steady rate, and they simply do not. Dogs mature extremely quickly at first: a one-year-old dog is roughly equivalent to a human in their mid-teens, and a two-year-old is comparable to a human in their mid-twenties. After that, ageing slows to something closer to four to five human years per calendar year. Research on canine DNA, including a well-known study of Labrador retrievers at the University of California San Diego, confirmed this curve by tracking chemical changes to DNA over time. Our calculator uses this modern understanding rather than the tired old seven-times table.
Size matters too
Unusually in the animal kingdom, smaller dogs live longer than bigger ones. A Chihuahua reaching 15 or 16 is unremarkable, while giant breeds like Great Danes are considered seniors by six or seven. That means the same birthday can represent a different life stage depending on the dog: a nine-year-old Jack Russell is comfortably middle-aged, while a nine-year-old Bernese Mountain Dog is elderly. Whatever the number says, the practical takeaway is the same: as your dog enters their senior years, book more regular vet check-ups, watch their weight (our calorie calculator helps, as senior dogs usually need fewer calories), and keep an eye out for slowing down on walks or stiffness after rest, which are worth mentioning to your vet rather than writing off as just old age.
FAQ
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Roughly 15 human years, not 7. Dogs do the vast majority of their growing up in their first year.
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It depends on size. Small breeds are generally considered senior from around 10 to 12, medium breeds from 8 to 10, and large or giant breeds from as early as 6 or 7.
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The biggest factors within your control are keeping your dog lean, feeding a balanced diet, regular exercise, dental care and routine vet checks. Keeping weight in a healthy range is the single best-evidenced way to add healthy years.