Enter your dog’s age to see a rough human-age equivalent. The old “7 years per dog year” rule is a myth, so this calculator shows two better-supported estimates.
Both are rough. The AKC notes that larger breeds tend to have shorter lifespans and are often considered senior at 5 to 6 years, compared with about 7 for small dogs.
No. The AVMA states that dogs do not age at a rate of 7 human years for each year. The AKC calls the 7-to-1 rule outdated and without scientific basis.
The AVMA guideline puts the first year of a medium-sized dog at about 15 human years, the second year at about 9 more, and each year after that at about 5.
It depends on size. According to the AKC, larger breeds tend to have shorter lifespans and are often considered senior at 5 to 6 years, compared with about 7 for small dogs.
Last checked: November 10, 2026. This is a general estimate, not veterinary advice. Ask your vet about your pet’s life stage and care.
