Dog Age Calculator
Dogs age faster than humans, but not at a flat seven-to-one rate. The first year of a dog's life is roughly equivalent to 15 human years, the second adds about 9 more, and each year after that adds around 5.
A 3-year-old dog is about 29 in human years.
Conversion chart
| Dog years | Human years |
|---|---|
| 1 | 15 |
| 2 | 24 |
| 3 | 29 |
| 4 | 34 |
| 5 | 39 |
| 6 | 44 |
| 7 | 49 |
| 8 | 54 |
| 9 | 59 |
| 10 | 64 |
| 11 | 69 |
| 12 | 74 |
| 13 | 79 |
| 14 | 84 |
| 15 | 89 |
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About this tool
Dogs age faster than humans, but not at a flat seven-to-one rate. The first year of a dog's life is roughly equivalent to 15 human years, the second adds about 9 more, and each year after that adds around 5. For your exact age in years, months and days use the age calculator. Related tools: date calculator, time calculator, day of the week, event countdowns.
Frequently asked questions
How do you convert dog years to human years?
The widely used approximation is 15 human years for the first dog year, 9 more for the second (24 total), and about 5 human years for every year after that. So a 5-year-old dog is around 39 in human years.
Is one dog year really seven human years?
The old 'seven years' rule is a rough average. Dogs mature very quickly in their first two years, then age more slowly, so the multiplier changes as the dog gets older.
Does breed size change the calculation?
Yes. Smaller breeds generally live longer and age more slowly than large breeds. This calculator uses the common mid-range formula; very large or very small dogs can differ by several years.