Dog Age Calculator
Convert your dog's age to human years. Select your dog's size and enter their age to see the equivalent human age. Small breeds age slower than large breeds.
Puppy / Junior stage
How to Calculate Dog Years to Human Years
Converting dog years to human years is more complex than the old "1 dog year = 7 human years" rule. Modern veterinary science shows that dogs age much faster in their early years and then the rate slows down.
The formula used in our calculator is: the first year of a dog's life equals 15 human years, the second year adds 9 more human years, and each year after adds 4-6 human years depending on breed size:
- Small breeds (under 20 lbs / 9 kg): +4 human years per dog year after age 2
- Medium breeds (20-50 lbs / 9-23 kg): +5 human years per dog year after age 2
- Large breeds (over 50 lbs / 23 kg): +6 human years per dog year after age 2
Small breeds tend to live longer than large breeds, which is reflected in the slower aging rate. Use our dog age calculator above to convert your pup's age instantly.