Dog Age Calculator: Dog Years to Human Years
Convert your dog's age to human years by size, with the classic vet chart and the newer DNA-based formula.
How the dog age calculator works
The old "multiply by 7" rule is a myth. Dogs grow up very fast in the first two years: a 1 year old dog is about 15 in human years and a 2 year old is about 24. After that, each dog year counts as 4 to 7 human years depending on size, because big dogs age faster than small ones.
We also show the DNA-based formula from a 2019 study at UC San Diego (human age = 16 × ln(dog age) + 31). It was built with Labrador Retrievers, so treat it as a fun second opinion.
Dog years chart
| Dog age | Small | Medium | Large | Giant |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 | 24 |
| 5 | 36 | 39 | 42 | 45 |
| 8 | 48 | 54 | 60 | 66 |
| 10 | 56 | 64 | 72 | 80 |
| 13 | 68 | 79 | 90 | 101 |
For fun and general information. Your vet knows your dog best.