How Old Is My Dog Calculator
Find your dog’s age in human years by breed size
Dog Age (years)
Breed Size
How Old Is My Dog? Understanding Dog Age
The old rule of multiplying your dog’s age by 7 is inaccurate. Dogs age rapidly in their first two years — a 1-year-old dog is already equivalent to a 15-year-old human. After that, aging slows down and varies significantly by breed size. Our how old is my dog calculator uses the size-adjusted formula accepted by veterinary nutritionists worldwide.
Dog Age to Human Years by Size
| Dog Age | Small | Medium | Large | Giant |
|---|---|---|---|---|
| 1 year | 15 | 15 | 15 | 15 |
| 3 years | 28 | 29 | 30 | 32 |
| 7 years | 47 | 49 | 54 | 62 |
| 12 years | 70 | 74 | 84 | 99 |
FAQs
How do I estimate my rescue dog’s age?
A vet can estimate age from teeth (eruption pattern, wear, tartar build-up), eyes (nuclear sclerosis appears around age 7), coat (grey muzzle typically from 5-7+), and joint condition. A DNA test from companies like Embark can also give a biological age estimate.
Is the ×7 rule accurate?
No. It is a rough average that ignores the fact that dogs age 15 human years in year one, 9 in year two, and then slow down. It also ignores the major difference in aging rate between small and giant breeds. Our size-adjusted calculator is far more accurate.
Conclusion
Our how old is my dog calculator gives you an instant, size-accurate human-year equivalent. For life stage nutrition, use our dog food calculator and for health tracking, our weight calculator.