Dog Age Calculator
A general guide to your dog's approximate age in human years, based on size — not the outdated "multiply by 7" rule.
Adult
Your dog is in the prime of their life.
Get even more in the Pet Capsule app
Track age milestones, set your own care reminders, and keep organised care notes tailored to your dog's age and breed.
Dog Age Chart by Size
Dogs age differently based on their size. Larger breeds age faster and have shorter lifespans.
| Dog Age | Small <20 lbs | Medium 20-50 lbs | Large 50-100 lbs | Giant >100 lbs |
|---|
How This Calculator Works
Not the 7-Year Myth
The old "1 dog year = 7 human years" formula is inaccurate. Dogs mature rapidly in their first 2 years, then aging slows.
Size Matters
Small dogs live longer and age more slowly after maturity. Giant breeds age fastest, with significantly shorter lifespans.
Size-Based Estimate
This is a general guide that applies commonly published breed-size aging rates. It is an approximation for your own notes, not a substitute for your vet.
Keep your pet's care records in one place
Pet Capsule helps you record milestones and set your own care reminders, organised by your pet's breed and age.
Join the Waitlist