BMI Calculator Using HTML , CSS & JavaScript With Source Code
Introduction:
The Body Mass Index (BMI) calculator is a web application designed to help users calculate their BMI based on their height and weight. BMI is a measure of body fat based on an individual’s weight in relation to their height. This calculator provides a convenient way for users to assess their body composition and determine if they are underweight, normal weight, overweight, or obese according to standard BMI categories.
Key Features:
User Input: The calculator allows users to enter their height and weight in metric units (centimeters and kilograms) or imperial units (feet, inches, and pounds).
BMI Calculation: The application calculates the BMI using the formula: BMI = weight (kg) / (height (m))^2. The result is then displayed to the user.
BMI Categories: The calculated BMI is categorized into different ranges such as underweight, normal weight, overweight, and obese. These categories provide users with an understanding of their current body composition.
Responsive Design: The web application is designed to be responsive, adapting to different screen sizes and devices, ensuring optimal user experience across desktop, tablet, and mobile devices.
Attractive Layout Design: The user interface is visually appealing, featuring a modern and clean design to enhance the overall user experience.
Background Animation: The application incorporates a background animation to add an element of visual interest and engagement, making the user experience more enjoyable.
Source Code :
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>BMI Calculator</title>
<link data-asynced="1" as="style" onload="this.onload=null;this.rel='stylesheet'" rel="preload" href="style.css">
</head>
<body>
<div class="container">
<h1>BMI Calculator</h1>
<div class="input-container">
<label for="height">Height:</label>
<input type="number" id="height" placeholder="Height (cm)">
</div>
<div class="input-container">
<label for="weight">Weight:</label>
<input type="number" id="weight" placeholder="Weight (kg)">
</div>
<button onclick="calculateBMI()">Calculate</button>
<div id="result"></div>
</div> <script type="litespeed/javascript" data-src="script.js"></script> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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t.prototype={update:function(t){var e,n,a,i=this._settings,o=X(t,i);{if(h(this,o.length),!tt&&et)return H(i)?(e=i,n=this,o.forEach(function(t){-1!==kt.indexOf(t.tagName)&&F(t,e,n)}),void h(n,0)):(t=this._observer,i=o,t.disconnect(),a=t,void i.forEach(function(t){a.observe(t)}));this.loadAll(o)}},destroy:function(){this._observer&&this._observer.disconnect(),Q(this._settings).forEach(function(t){y(t)}),delete this._observer,delete this._settings,delete this.loadingCount,delete this.toLoadCount},loadAll:function(t){var e=this,n=this._settings;X(t,n).forEach(function(t){b(t,e),V(t,n,e)})},restoreAll:function(){var e=this._settings;Q(e).forEach(function(t){U(t,e)})}},t.load=function(t,e){e=i(e);V(t,e)},t.resetStatus=function(t){r(t)},Z&&function(t,e){if(e)if(e.length)for(var n,a=0;n=e[a];a+=1)o(t,n);else o(t,e)}(t,window.lazyLoadOptions),t});!function(e,t){"use strict";function a(){t.body.classList.add("litespeed_lazyloaded")}function n(){console.log("[LiteSpeed] Start Lazy Load 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</html>
CSS (style.css):
/* @codewithcurious.com */
body {
background-color: #f2f2f2;
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
}
.container {
max-width: 400px;
margin: 50px auto;
padding: 20px;
background-color: #fff;
border-radius: 5px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
text-align: center;
}
h1 {
color: #333;
}
.input-container {
margin-bottom: 10px;
text-align: left;
}
input[type="number"] {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 5px;
box-sizing: border-box;
}
button {
background-color: #4caf50;
color: #fff;
border: none;
padding: 10px 20px;
border-radius: 5px;
cursor: pointer;
}
#result {
margin-top: 20px;
font-weight: bold;
}
/* @codewithcurious.com */
body {
background-color: #f2f2f2;
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
}
.container {
max-width: 400px;
margin: 50px auto;
padding: 20px;
background-color: #fff;
border-radius: 5px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
text-align: center;
}
h1 {
color: #333;
}
.input-container {
margin-bottom: 10px;
text-align: left;
}
input[type="number"] {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 5px;
box-sizing: border-box;
}
button {
background-color: #4caf50;
color: #fff;
border: none;
padding: 10px 20px;
border-radius: 5px;
cursor: pointer;
}
#result {
margin-top: 20px;
font-weight: bold;
}
JavaScript (script.js):
//@codewithcurious.com
function calculateBMI() {
var heightInput = document.getElementById("height");
var weightInput = document.getElementById("weight");
var resultDiv = document.getElementById("result");
var height = parseFloat(heightInput.value);
var weight = parseFloat(weightInput.value);
if (isNaN(height) || isNaN(weight)) {
resultDiv.innerHTML = "Please enter valid height and weight.";
return;
}
var bmi = weight / ((height / 100) ** 2);
var category = "";
if (bmi < 18.5) {
category = "Underweight";
} else if (bmi < 25) {
category = "Normal weight";
} else if (bmi < 30) {
category = "Overweight";
} else {
category = "Obese";
}
resultDiv.innerHTML = "Your BMI is " + bmi.toFixed(2) + " (" + category + ")";
}
//@codewithcurious.com
function calculateBMI() {
var heightInput = document.getElementById("height");
var weightInput = document.getElementById("weight");
var resultDiv = document.getElementById("result");
var height = parseFloat(heightInput.value);
var weight = parseFloat(weightInput.value);
if (isNaN(height) || isNaN(weight)) {
resultDiv.innerHTML = "Please enter valid height and weight.";
return;
}
var bmi = weight / ((height / 100) ** 2);
var category = "";
if (bmi < 18.5) {
category = "Underweight";
} else if (bmi < 25) {
category = "Normal weight";
} else if (bmi < 30) {
category = "Overweight";
} else {
category = "Obese";
}
resultDiv.innerHTML = "Your BMI is " + bmi.toFixed(2) + " (" + category + ")";
}
Output:
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