Find your dog's real age in human years. Based on breed size — more accurate than ×7.
The old "multiply by 7" rule is a myth. Dogs age much faster in their first two years, then slow down — and the rate differs by breed size. Small dogs (under 10 kg) age slower after puppyhood and often live 12-16 years. Large dogs (over 25 kg) age faster and typically live 8-12 years. This calculator uses veterinary-approved size-adjusted formulas to give you an accurate human-age equivalent. It also shows your dog's life stage (puppy, junior, adult, senior), energy level, and average lifespan for their size. Perfect for pet owners, veterinarians, and animal shelters. All calculations run in your browser privately. Unlike the outdated "multiply by 7" myth, this calculator uses veterinary research showing that dogs age faster in their first two years, with the rate varying significantly between small, medium, large, and giant breeds.