Last Updated on September 20, 2023
13 in dog years roughly equals 74 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 13 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 old calculation
Many people believe that 1 dog year is equal to 7 dog years. This assumption probably started in the 1950s, but this isn’t the best method of calculating it.
Although there’s been a lot of research since then disproving the 7:1 ratio, people are still holding on the idea. The formula could have been based on the belief that dogs live for about 10 years old and humans up to 70, but honestly we don’t know the date it was first introduced.
The 7 to 1 rule is easy to remember and calculate but it’s not the best idea.
The new calculation
The best method of converting human years into dog years is more complicated.
The American Veterinary Medical Association has the following things to be said about it:
- The very first year of a dog’s life is approximately 15 years human.
- The second year of a dog’s life equals about 9 human years.
- From that point forward 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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