Last Updated on September 20, 2023
9 months in dog years roughly equals 10 years 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 months 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
Most people still assume that 1 dog year equals 7 dog years; this assumption was probably first introduced in the 1950s, however it’s not the right way to measure it.
While there has been a lot of research that has disproved this ratio of 7 to 1, people continue to believe the idea. The formula could have been based on the assumption that dogs live to 10-ish years and humans reach 70 years old, but honestly it’s hard to tell when it first started.
The 7-1 rule is simple to calculate and remember, it’s unfortunately incorrect.
The correct formula
The correct way of converting human years into dog years is a bit more complicated.
The American Veterinary Medical Association has the following things to be said about it:
- The first year of a medium-sized dog’s life is approximately 15 years human.
- The second year of a dog’s life is equivalent to 9 human years.
- From then on each human year is equal to the equivalent of four to 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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