Dog Age Calculator — Dog Years to Human Years
Enter your dog's age and size to estimate the equivalent human age. Dogs age faster in the first two years, and larger breeds age faster afterwards.
Dog years to human years chart
| Dog age | Small | Medium | Large | Giant |
|---|---|---|---|---|
| 1 yr | 15 | 15 | 15 | 15 |
| 2 yr | 24 | 24 | 24 | 24 |
| 3 yr | 28 | 29 | 30 | 31 |
| 4 yr | 32 | 34 | 36 | 38 |
| 5 yr | 36 | 39 | 42 | 45 |
| 6 yr | 40 | 44 | 48 | 52 |
| 7 yr | 44 | 49 | 54 | 59 |
| 8 yr | 48 | 54 | 60 | 66 |
| 10 yr | 56 | 64 | 72 | 80 |
| 12 yr | 64 | 74 | 84 | 94 |
| 14 yr | 72 | 84 | 96 | 108 |
| 15 yr | 76 | 89 | 102 | 115 |
Estimates use the common rule of 15 human years for the first year, 9 for the second, and 4–7 per year afterwards depending on size. Individual dogs vary.
Frequently Asked Questions
How old is a 1-year-old dog in human years?
Roughly 15 human years — about the stage of a teenager.
Do big dogs age faster?
Generally yes. Larger breeds tend to have shorter lifespans and move into their senior years earlier than small breeds.
Is the 7-to-1 rule accurate?
No. Dogs age faster early in life and at different rates by size, so size-based estimates are more realistic.
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Results are estimates for general guidance and do not replace advice from a qualified veterinarian.