15 in dog years roughly equals 83 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)|
Calculating how many human years is 15 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 one dog year equals 7 dog years; this assumption likely began in the 1950s, but this isn’t the best way to measure it.
There has been plenty of research that has disproved this ratio of 7 to 1, that people still believe in it. This formula might be based on the belief that dogs live for 10 or so years, and humans live to 70, but honestly we don’t know the date it was first introduced.
Therefore, while the 7 to 1 rule is easy to calculate and remember, it’s unfortunately incorrect.
The new formula
The proper method to convert human years to dog years is more complicated.
The American Veterinary Medical Association has the following things to say about it::
- The first year of a medium-sized dog’s life equals around 15 human years.
- The second year of a dog’s life is roughly 9 years for humans.
- 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.