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Compare dog years and human-equivalent years with a simple general estimate. The result does not account for breed, size, health, or individual lifespan.
How it works:
This calculator provides a rough dog-to-human age comparison. It treats a one-year-old dog as approximately 15 human years, a two-year-old dog as approximately 24 human years, and each later dog year as four additional human years. The reverse calculation uses the same model.
This is more useful than multiplying every dog year by seven, but it is still only a general illustration. The calculator does not ask for breed, body size, weight, health history, or expected lifespan.
Dogs mature quickly during their first two years. After that, aging varies substantially. Large dogs often reach senior life stages earlier than small dogs, and individual health, genetics, nutrition, activity, and veterinary care all affect lifespan and quality of life.
Because those factors are not part of the input, the result should not be interpreted as a medical assessment, life-expectancy prediction, or schedule for veterinary treatment.
The reverse direction maps up to 15 human years to one dog year, up to 24 human years to two dog years, and later years using the same four-to-one step.
Use your dog's actual age and your veterinarian's advice for vaccination, nutrition, exercise, dental care, screening, or age-related symptoms. Contact a veterinarian if you are concerned about behavior, mobility, appetite, pain, or other changes rather than relying on an online age comparison.
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Where this comes from
Background on breed and size effects; the seven-year rule is a rule of thumb, not a clinical standard.
Links last checked August 13, 2026.