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add project: BMI Calculator
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‎BMI-Calculator/README.md

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# BMI Calculator
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**A simple Body Mass Index (BMI) calculator built using HTML, CSS, and JavaScript.**
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This calculator helps users calculate their BMI by entering their height and weight and also provides a guide for interpreting the result.
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### Functionalities
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- **BMI Calculation**: Calculates the Body Mass Index (BMI) based on height in centimeters and weight in kilograms.
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- **Input Validation**: Ensures valid numeric inputs for height and weight, providing feedback for invalid inputs.
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- **BMI Range Guide**: Displays a guide for interpreting BMI ranges (Underweight, Normal, Overweight).
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## Description
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This is a basic web-based BMI calculator that allows users to input their height and weight to calculate their BMI. The BMI is calculated using the following formula:
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**BMI = Weight (kg) / (Height (cm) * Height (cm) / 10000)**
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Where:
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- **Weight (kg)** is the person's weight in kilograms.
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- **Height (cm)** is the person's height in centimeters.
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The result is displayed on the screen along with a color-coded message based on the calculated value. The app also shows a BMI weight guide to help users understand where their BMI falls in terms of underweight, normal, and overweight categories.
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## Prerequisites
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No external libraries or packages are required for this project. It only uses HTML, CSS, and vanilla JavaScript.
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## Installing Instructions
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1. Clone the repository:
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```bash
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git clone https://github.com/your-username/All-In-One-Javascript-Projects.git
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```
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2. Navigate to the project directory:
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```bash
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cd All-In-One-Javascript-Projects/BMI-Calculator
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```
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3. Open the `index.html` file in a web browser:
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## Author
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- Aman Kumar (@[king04aman](https://github.com/king04aman))

‎BMI-Calculator/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<link rel="stylesheet" href="style.css">
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<title>BMI Calculator</title>
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</head>
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<body>
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<div class="container">
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<h1>BMI Calculator</h1>
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<form id="bmiForm">
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<p>
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<label for="height">Height in CM: </label>
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<input type="text" id="height" placeholder="Enter height">
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</p>
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<p>
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<label for="weight">Weight in KG: </label>
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<input type="text" id="weight" placeholder="Enter weight">
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</p>
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<button type="submit">Calculate</button>
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</form>
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<div id="results"></div>
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<div id="weight-guide">
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<h3>BMI Weight Guide</h3>
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<p>Underweight: Less than 18.6</p>
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<p>Normal Range: 18.6 - 24.9</p>
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<p>Overweight: Greater than 24.9</p>
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</div>
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</div>
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<script src="main.js"></script>
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</body>
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</html>

‎BMI-Calculator/main.js

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const form = document.querySelector('form');
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form.addEventListener('submit', function(e) {
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e.preventDefault(); // Prevent form submission
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const height = parseFloat(document.querySelector('#height').value);
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const weight = parseFloat(document.querySelector('#weight').value);
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const results = document.querySelector('#results');
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// Validate height and weight
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if (!height || height <= 0 || isNaN(height)) {
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results.innerHTML = "Please provide a valid height in cm";
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} else if (!weight || weight <= 0 || isNaN(weight)) {
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results.innerHTML = "Please provide a valid weight in kg";
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} else {
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const bmi = (weight / ((height * height) / 10000)).toFixed(2);
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results.innerHTML = `<span>Your BMI: ${bmi}</span>`;
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}
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});

‎BMI-Calculator/style.css

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body {
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display: flex;
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justify-content: center;
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align-items: center;
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height: 100vh;
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margin: 0;
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background-color: #f0f0f0;
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font-family: Arial, sans-serif;
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}
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.container {
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width: 400px;
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background-color: #ffeb3b;
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padding: 20px;
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border-radius: 10px;
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box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
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text-align: center;
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}
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h1 {
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color: #333;
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margin-bottom: 20px;
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}
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input[type="text"] {
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width: 80%;
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height: 35px;
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margin: 10px 0;
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border: 1px solid #ccc;
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border-radius: 5px;
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padding-left: 10px;
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font-size: 16px;
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}
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#results {
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font-size: 24px;
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color: #007bff;
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margin-top: 20px;
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}
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#weight-guide {
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margin-top: 30px;
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}
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button {
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width: 80%;
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height: 45px;
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background-color: #007bff;
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color: #fff;
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border: none;
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border-radius: 5px;
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font-size: 20px;
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cursor: pointer;
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margin-top: 20px;
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}
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button:hover {
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background-color: #0056b3;
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}
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#weight-guide p {
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font-size: 14px;
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}

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