My First Python Project: Building a BMI Calculator

Hello, and welcome to my journey as I dive into the 100 Days of Code challenge! by Dr. Angela Yu from Udemy.
I'm excited to share my very first Python project: a BMI (Body Mass Index) calculator.

BMI is a simple way to measure whether your weight is in a healthy range based on your height. Here's the code I wrote:

print("Welcome to BMI calculator !! \n")
weight = float(input("What is your weight in kg? eg: 60 70 80: "))
height = float(input("What is your height in meters? eg: 1.56 1.75: "))
bmi = round(weight / (height ** 2), 2)

if bmi < 18.5:
    print(f"Your BMI is: {bmi} - Underweight")
elif bmi < 25:
    print(f"Your BMI is: {bmi} - Normal")
else:
    print(f"Your BMI is: {bmi} - Overweight \n START WORKING OUT!!")

Breaking It Down

The code starts by welcoming you to the BMI calculator. Then, it asks for your weight (in kilograms) and height (in meters). After that, it calculates your BMI using the formula:

bmi = weight / (height ** 2)

This formula divides your weight by the square of your height. Finally, I round the result to two decimal places for easier reading:

bmi = round(weight / (height ** 2), 2)

Depending on your BMI value, the program will tell you if you're underweight, normal weight, or overweight. If you're overweight, it even gives you a little nudge to start working out!

Efficiency Tip

Initially, I thought about splitting the BMI calculation into two separate steps:

bmi = weight / (height ** 2)
new_bmi = round(bmi, 2)

However, I realized that combining them into one line makes the code more efficient and easier to read.

Conclusion

This was a simple but fun project to kick off my 100 Days of Code journey. I'm looking forward to learning more and sharing it with you as I go along!

Thanks for reading, and happy coding! 🚀

---