Human Age Equivalent
This calculator used to calculate dogs age equivalent to Human age in years. Convert dog years to human years accurately with our Dog Age Calculator. enter the Dog age and see instant results, and understand your pet’s age in human terms. Simple, scientific, and free.
Dog Years to Human Years
Dog years differ from human years due to dogs maturing faster early in life. A dog’s first year is roughly equivalent to 15 human years.
Breed and size impact aging. Smaller dogs often live longer but mature quicker in their early years. Larger breeds may age more slowly at first but can reach middle age by around 5 years. Tiny and toy breeds typically aren’t considered "seniors" until about age 10, while medium-sized dogs fall in between on both maturity and lifespan.
How To Calculate Dog Age
The outdated dog age calculator—multiplying your dog’s age in human years by seven—was simple, but inaccurate. While it does call attention to the general idea that dogs age more quickly than people, this method has a couple of big problems.
First, it treats every year of a dog’s life the same. In other words, it says that a 1-year-old dog is 7 in dog years, a 2-year-old dog is 14, a 3-year-old dog is 21, and so on. But this is not the case.
Compared to humans, dogs race through their early years. When dogs reach 1 year old, they are developmentally similar to a 15-year-old human teenager. And by their second birthday, most dogs are more or less comparable to a fully mature 24-year-old person.
At this point, though, their aging slows down. Just how dramatic that slowdown is depends on another important factor: the dog’s size.
Dog Age to Human Age Chart
| Dog Age (Years) | Tiny (<10 lbs) | Small (10–25 lbs) | Medium (25–50 lbs) | Large (>50 lbs) |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 | 24 |
| 3 | 28.2 | 28.5 | 29 | 29.5 |
| 4 | 32.4 | 33 | 34 | 35 |
| 5 | 36.6 | 37.5 | 39 | 40.5 |
| 6 | 40.8 | 42 | 44 | 46 |
| 7 | 45 | 46.5 | 49 | 51.5 |
| 8 | 49.2 | 51 | 54 | 57 |
| 9 | 53.4 | 55.5 | 59 | 62.5 |
| 10 | 57.6 | 60 | 64 | 68 |
| 11 | 61.8 | 64.5 | 69 | 73.5 |
| 12 | 66 | 69 | 74 | 79 |
| 13 | 70.2 | 73.5 | 79 | 84.5 |
| 14 | 74.4 | 78 | 84 | 90 |
| 15 | 78.6 | 82.5 | 89 | 95.5 |
| 16 | 82.8 | 87 | 94 | 101 |
| 17 | 87 | 91.5 | 99 | 106.5 |
| 18 | 91.2 | 96 | 104 | 112 |
| 19 | 95.4 | 100.5 | 109 | 117.5 |
| 20 | 99.6 | 105 | 114 | 123 |
Notes:
- The first 2 dog years represent rapid aging, equivalent to ~24 human years.
- After age 2:
- Tiny dogs age ~4.2 human years/year.
- Small dogs age ~4.5 human years/year.
- Medium dogs age ~5 human years/year.
- Large dogs age ~5.5 human years/year.
- This chart offers an approximate guide. Individual health, breed, and genetics also play a role in aging.