Last Updated on September 3, 2022 by Becky Roberts
9 in dog years roughly equals 56 in human years.
This calculation was made for a medium-sized dog (21 to 50 pounds) using the recommendations from the AKC (American Kennel Club).
There are 2 ways of calculating the conversion from human years to dog years. The above result was calculated using the more correct way, we’ll explain what makes the other way incorrect later in this article.
The table below shows dog years and their equivalent to human years, with different columns for different sizes.
| Dog's Age in Years | Human Years (Small Dog) | Human Years (Medium Dog) | Human Years (Large Dog) |
|---|---|---|---|
| 1 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 |
| 3 | 28 | 28 | 28 |
| 4 | 32 | 32 | 32 |
| 5 | 36 | 36 | 36 |
| 6 | 40 | 42 | 45 |
| 7 | 44 | 47 | 50 |
| 8 | 48 | 51 | 55 |
| 9 | 52 | 56 | 61 |
| 10 | 56 | 60 | 66 |
| 11 | 60 | 65 | 72 |
| 12 | 64 | 69 | 77 |
| 13 | 68 | 74 | 82 |
| 14 | 72 | 78 | 88 |
| 15 | 76 | 83 | 93 |
| 16 | 80 | 87 | 99 |
Calculating how many human years is 9 in dog years
As mentioned above, there are 2 main ways of calculating dog years to human years and vice versa. There’s a correct way and an incorrect way.
The incorrect formula
Many people believe that 1 dog year is equal to 7 dog years; this assumption probably started in the 1950s, however it’s not the correct method of calculating it.
There has been plenty of research that has disproved this ratio of 7 to 1, that people still believe in the idea. This formula may be based on an idea that dogs live to about 10 years old and humans up can live to 70, however we don’t know the date it was first introduced.
So while the 7 to 1 rule is easy to understand and keep in mind however, it’s sadly incorrect.
The new calculation
The best method of converting human years into dog years is more complex.
The American Veterinary Medical Association has the following to add to it:
- The beginning year of a medium-sized dog’s life is about 15 years for humans.
- The second year of a dog’s existence is equivalent to 9 human years.
- From that point onwards each year of a human equals four or five dog years.
Keep in mind that smaller dogs tend to live longer than bigger dogs. Scientists concluded that every 4.4 pounds of body mass reduced a dog’s life expectancy by about a month.
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