Dog Age Calculator — Human Years by Size Class

How to use

1. Enter your dog's age in years and extra months.
2. Pick the size class: small, medium or large.
3. Press Convert for the human-equivalent age and life stage.
4. Read the size-aware wellness note and share it at the vet visit.

About this tool

Dogs do not age seven human years per year — that vintage rule collapses for puppies and seniors alike. This calculator uses the widely taught veterinary guideline: the first dog year counts as roughly 15 human years, the second adds about 9, and every year after adds around 5 human years for small and medium breeds and about 6 for large breeds (giant breeds trend toward 7). Enter years and months plus a size class and you get a human-equivalent age, a life-stage label from puppy to senior, and a size-aware wellness note. It is an educational estimate, not professional advice — breed, health history and lifestyle matter just as much, so loop in your veterinarian for real guidance on diet, exercise and screening.

FAQ

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