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Dog Age Calculator: Dog Years to Human Years
How old is your dog in human years? Our calculator uses breed size — not the outdated 7× rule.
Dog Age to Human Age Conversion Table
| Dog Age | Small <10kg | Medium 10-25 | Large 25-45 | Giant >45kg |
|---|---|---|---|---|
| 1 year | 15 | 15 | 15 | 14 |
| 2 years | 24 | 24 | 24 | 22 |
| 3 years | 28 | 30 | 30 | 31 |
| 4 years | 32 | 35 | 36 | 40 |
| 5 years | 36 | 41 | 42 | 49 |
| 7 years | 44 | 52 | 54 | 67 |
| 10 years | 56 | 68 | 72 | 94 |
| 15 years | 76 | 96 | 102 | 139 |
Based on AAHA Canine Life Stage Guidelines. Giant breeds have shorter average lifespans, so ratios compress faster.
Why we don't use the "7× rule"
The popular "multiply by 7" formula has no scientific basis. Dogs mature rapidly in the first 2 years (reaching sexual maturity and full size), then age more slowly thereafter. Our calculator uses size-adjusted life stage guidelines from: the American Animal Hospital Association (AAHA) and the 2020 UCSD epigenetics methylation study (Labrador reference). Larger breeds age faster due to higher metabolic rates and faster cell division — not because of size itself.
AAHA Life Stage Guidelines →This tool provides general reference information only and does not constitute veterinary advice. Always consult a licensed veterinarian for health decisions.