Dog Age Calculator
Convert your dog's age to human years with our scientifically-based calculator. Accounts for size and breed differences.
About This Calculator
Our Dog Age Calculator uses the latest veterinary research to convert your dog's age into human equivalent years. The old "multiply by 7" myth has been debunked — dogs age much faster in their first two years of life, then the rate slows down and varies by size.
According to the American Veterinary Medical Association, a dog's first year is roughly equal to 15 human years, the second year adds about 9 human years (totaling 24), and each subsequent year adds approximately 5 years for small dogs, 6 for medium dogs, and 7 for large dogs. Larger breeds tend to age faster and have shorter lifespans than smaller breeds.
📖 Read our guide: How to Calculate Your Dog's Age in Human Years — including size-based conversion charts and common myths.
Frequently Asked Questions
How accurate is the dog age calculator?
Our calculator is based on veterinary research from the AVMA and other leading organizations. While it provides a good estimate, individual dogs may age differently based on genetics, diet, and overall health.
Why does dog size matter for age calculation?
Larger dog breeds age faster than smaller breeds after the first two years. This is a well-documented veterinary finding — large dogs have shorter lifespans and show signs of aging earlier, which is reflected in our calculations.
Is the "multiply by 7" rule correct?
No, the "multiply by 7" rule is a myth. Dogs age much faster in their first two years (reaching 24 human years by age 2), then the rate varies by size. A 10-year-old small dog is about 56 in human years, not 70.