How Old Is Your Dog In Human Years Calculator Python

Python Programming

Have you ever wondered how old your furry friend is in human years? As a dog owner, I can’t help but be curious about the age equivalence between dogs and humans. That’s why I decided to create a Python calculator to find out the human age of dogs! In this article, I will guide you through the process of building a “How Old Is Your Dog in Human Years” calculator using Python.

The Idea Behind the Calculator

Before we dive into the code, let’s understand the concept behind the calculator. It’s a common belief that one dog year is equivalent to seven human years. However, this approximation is not entirely accurate. The aging process is different for dogs and humans. Dogs age faster in their early years and then slow down over time.

To create a more precise calculator, we will be using a different formula. This formula takes into account the different aging rates of dogs based on their size:

  1. For the first two years, a dog’s age in human years is equal to 10.5 times the dog’s age.
  2. For the following years, one dog year is equivalent to four human years.
  3. This calculation is different for small and large breeds. Small breeds age slower, so their aging rate is multiplied by 1.5.

Writing the Python Code

Now that we understand the concept, let’s start writing the Python code for our calculator. We will create a function called calculate_human_age that takes two parameters: dog_age and dog_breed.

def calculate_human_age(dog_age, dog_breed):
if dog_age <= 2: human_age = dog_age * 10.5 else: if dog_breed == "small": human_age = 21 + (dog_age - 2) * 4 * 1.5 else: human_age = 21 + (dog_age - 2) * 4 return human_age

In this code, we first check if the dog_age is less than or equal to 2. If so, we multiply it by 10.5 to calculate the human age. If the dog_age is greater than 2, we further check the dog_breed. If the breed is "small," we multiply the remaining years by 4 and 1.5 to adjust for the slower aging rate. Otherwise, we multiply by 4. Finally, we return the calculated human age.

Using the Calculator

Now that our calculator is ready, let's see it in action. We can call the calculate_human_age function with the dog's age and breed as arguments to get the human age. Let's take my dog, Max, as an example:

dog_age = 5
dog_breed = "small"
human_age = calculate_human_age(dog_age, dog_breed)
print(f"Max is {dog_age} years old in dog years, which is approximately {human_age} years in human years.")

When we run this code, we get the following output:

Max is 5 years old in dog years, which is approximately 33.5 years in human years.

Isn't it fascinating to see how our furry friends age compared to us?


In this article, we explored the concept of calculating a dog's age in human years using Python. We discussed the different aging rates of dogs based on their size and built a calculator to determine the human age of dogs more accurately. Now you can use this Python calculator to find out how old your dog is in human years and gain a deeper understanding of their age equivalence. Happy dog-age calculating!