Convert your dog's age to human-equivalent years based on breed size. More accurate than the old "times 7" rule. Pure client-side.
The old rule of multiplying dog years by 7 is overly simplistic. In reality, dogs age rapidly in their first two years, and the rate varies significantly by breed size. Small dogs tend to live longer and age more slowly after adulthood, while large and giant dogs age faster and have shorter lifespans. This calculator uses veterinary research-based estimates to convert your dog's chronological age into human-equivalent years, adjusted for their size category.
The old "multiply by 7" rule is a rough estimate that ignores breed size differences. In reality, dogs age very rapidly in their first two years (reaching ~15 human years by age 1 and ~24 by age 2), and then aging slows differently based on size. Small dogs can live 15+ years, while giant breeds may only reach 8–10 years.
Use your dog's adult weight to determine the size category: Small (under 20 lbs / 9 kg), Medium (20–50 lbs / 9–23 kg), Large (50–90 lbs / 23–41 kg), or Giant (over 90 lbs / 41 kg). If unsure, choose the category that matches your dog's weight range.
This calculator uses veterinary research-based estimates widely accepted by veterinarians. While it provides a good approximation, individual dogs may vary based on genetics, health, diet, and lifestyle. Always consult your vet for personalized health advice.
Yes! Enter the months field to calculate fractional ages. A 6-month-old puppy is approximately equivalent to a 7–8-year-old human child, depending on size. This helps you understand developmental milestones and vaccination schedules.
Senior dogs are in the later stage of adulthood but still relatively healthy, typically entering this stage around 10 human-equivalent years for medium breeds. Geriatric dogs are very old, often requiring special medical attention, supplements, and diet adjustments, usually entering this stage around 15+ human-equivalent years.