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How to Create a BMI Calculator Using C++

Our team is thrilled to present a comprehensive guide on creating a BMI (Body Mass Index) calculator using the powerful C++ programming language. BMI calculators are invaluable tools for estimating an individual's body fat based on their weight and height. In this guide, we not only provide you with the complete code but also offer detailed explanations for each code block, ensuring that you gain a solid grasp of the entire process. Whether you're a beginner looking to explore programming or an experienced developer seeking a practical project, our guide will equip you with the knowledge and skills to create your own BMI calculator effortlessly.

Crafting a BMI Calculator in C++

Discover how to create a BMI calculator using C++ with our comprehensive guide. This resource is designed to help with your C++ assignment while enhancing your programming skills. By following our step-by-step instructions and code explanations, you'll not only master the BMI calculation but also gain valuable insights into C++ programming techniques. Whether you're a beginner looking to start your programming journey or a student seeking assistance with C++ assignment, our guide provides the knowledge and tools you need to succeed.


Before we dive into the guide, ensure that you have a C++ development environment set up on your computer.

The Code Explained

Here's the code for a BMI calculator:

```cpp #include #include // Include the cmath library for the pow() function using namespace std; int main() { // Declare variables to store weight (in kilograms) and height (in meters) double weight, height; // Prompt the user to enter their weight in kilograms cout << "Enter your weight in kilograms: "; cin >> weight; // Prompt the user to enter their height in meters cout << "Enter your height in meters: "; cin >> height; // Calculate BMI using the formula: BMI = weight (kg) / (height * height) (m^2) double bmi = weight / pow(height, 2); // Display the calculated BMI cout << "Your BMI is: " << bmi << endl; // Interpret the BMI result if (bmi < 18.5) { cout << "Underweight" << endl; } else if (bmi >= 18.5 && bmi < 25) { cout << "Normal weight" << endl; } else if (bmi >= 25 && bmi < 30) { cout << "Overweight" << endl; } else { cout << "Obese" << endl; } return 0; // Return 0 to indicate successful program execution } ```

This detailed explanation of the code will help you understand how it works and enable you to customize it to suit your needs.


  1. #include : This line includes the standard input and output library, allowing you to use input and output functions like cin and cout.
  2. #include : This line includes the cmath library, which provides mathematical functions such as pow() for calculating the square of height.
  3. using namespace std;: This line declares that we are using the std (standard) namespace, so we don't need to prefix cin and cout with std::.
  4. double weight, height;: Declare two double variables to store weight and height.
  5. cout << "Enter your weight in kilograms: ";: Display a prompt to the user to input their weight.
  6. cin >> weight;: Read the user's weight input and store it in the weight variable.
  7. cout << "Enter your height in meters: ";: Display a prompt to the user to input their height.
  8. cin >> height;: Read the user's height input and store it in the height variable.
  9. Calculate the BMI using the provided formula and store it in the bmi variable.

  10. cout << "Your BMI is: " << bmi << endl;: Display the calculated BMI to the user.
  11. Interpret the BMI result based on common categories and display the interpretation.

  12. return 0;: Indicates successful program execution by returning 0 to the operating system.


With our C++ BMI calculator code, you now have a powerful tool at your disposal. Whether you're building a website, a desktop application, or simply exploring C++ programming, this project is an excellent starting point. Feel free to adapt the user interface to match your project's requirements. Additionally, you can extend the functionality of your BMI calculator by integrating it with other features like data storage, charting, or even personalized health recommendations, making it a versatile addition to various software applications. The knowledge gained from this guide opens up endless possibilities for innovation and problem-solving in the realm of programming and health-related applications.