Dog Age Calculator – Convert Dog Years to Human Years

Do you want to know how old your dog is in human years? Our Dog Age Calculator provides an accurate human-age equivalent based on your dog’s size. Unlike the outdated “1 dog year = 7 human years” rule, modern research shows that dog aging varies by breed and size.

Enter your dog’s age and size below to see their real human-age equivalent!

Why Dog Age Calculation Varies by Size

The lifespan of a dog depends on its size and breed. Small dogs tend to live longer, while large and giant breeds age faster:

✔ Small breeds (e.g., Chihuahuas, Dachshunds) can live 15-20 years, aging more slowly after their first few years.
✔ Medium breeds (e.g., Cocker Spaniels, Border Collies) have a lifespan of 10-15 years.
✔ Large breeds (e.g., Golden Retrievers, Labrador Retrievers) typically live 8-12 years.
✔ Giant breeds (e.g., Great Danes, Mastiffs) age rapidly and often have lifespans of 6-10 years.

Why do big dogs age faster?

There have been a lot of theories about why large dogs age faster, including these:

• Larger breeds grow quickly, putting more strain on their bodies.
• They metabolize energy differently, leading to faster cellular breakdown.
• Genetics play a role, with some large breeds more prone to age-related diseases.

That’s why a one-size-fits-all dog age formula doesn’t work! Our Dog Age Calculator adjusts based on size for greater accuracy when giving you your dog’s age in human years.