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How to Create a BMI Calculator Using Python: Step-by-Step Guide

Body Mass Index (BMI) is a body fat measurement based on height and weight that is applicable to both adult males and females. In this article, we’ll look at how to make a BMI calculator in Python. We will go through each code block in detail, including both the feature used in the code and the example output.

BMI Index (Image from https://www.diabetes.co.uk/)

Python is an advanced programming language with numerous features that make it simple to create complicated programs. We will use Python’s input() function to receive user input and if/else statements to compare and report the BMI status in this project.

Step-by-Step Explanation of Code

The first thing we need to do is set up our Python BMI Calculator. Open up your preferred code editor, create a new file, and save it with a descriptive name such as “bmi_calculator.py.”

We will start by displaying a welcome message to the user.

print("\nWelcome to my BMI Calculator\n")

Then, we will use the input() function to get the user’s height and weight as inputs.

height = float(input("enter your height in m: "))
weight = float(input("enter your weight in kg: "))

Next, we will use the formula BMI = weight / height ** 2 to calculate the user’s BMI.

bmi = weight / height ** 2

Finally, we will use the if/else statements to compare the calculated BMI and print the appropriate BMI status.

if bmi < 18.5:
    print("You're Underweight")
elif bmi < 25:
    print("You're Normal Weight")
elif bmi < 30:
    print("You're Slightly Overweight")
elif bmi < 35:
    print("You're Obese")
else:
    print("You're Clinically Obese")

Here is the full code.

bmi_calculator.py

Sample output

Sample Output

We learnt how to make a BMI calculator as a beginner in Python in this article. We explored Python features utilized in the project, such as the input() function and if/else statements. This blog provided a step-by-step explanation of each code block, as well as the full code on GitHub Gist. I hope you found this article useful in your ongoing effort to learn Python programming.

This article is a part of my Python Project Journal. Please have a visit to my journal. Thank you!

From Beginner to Pro: A Python Project Journal of Learning and Innovation