How old is your dog in human years? A dog’s age in human years depends on its size — large breeds age faster than small ones. Use our free dog age calculator below to find out your dog’s real age and life stage.
🐶 Dog Age Calculator
Find out your dog’s age in human years, adjusted for size.
Frequently Asked Questions
How do I calculate my dog's age in human years?
Don't just multiply by 7. Count the first year as ~15 human years, the second as ~9, then add ~4-5 per year depending on size (small = 4, giant = 7). The calculator above applies the size adjustment automatically.
Is the 7-year rule accurate?
No. It's a myth based on average lifespans. Dogs age much faster in their first two years, and small breeds age more slowly than giant breeds — a 5-year-old Great Dane is "older" than a 5-year-old Chihuahua.
Do small dogs age slower than large dogs?
Yes. Small dogs (under 20 lbs) are considered senior around age 7 and often live 14–16 years; giant breeds can be senior by 5–6 and average 8–10 years.