Create 3D Calculator Mini-Project  In HTML CSS and JavaScript

A calculator performs mathematical calculations. It typically consists of user interface elements like buttons or input fields for numbers and operators (+, -, *, /), and it performs calculations based on user input.

Output :

Calculator gif (2)

Let's Make Design Using HTML& CSS

First we need to create basic starting template with required links of CSS  links in  head section of HTML file.

					<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>3D Calculator Using JavaScript</title>
    <link rel="stylesheet" href="style.css">
<body> <script data-no-optimize="1">var litespeed_vary=document.cookie.replace(/(?:(?:^|.*;\s*)_lscache_vary\s*\=\s*([^;]*).*$)|^.*$/,"");litespeed_vary||fetch("/wp-content/plugins/litespeed-cache/guest.vary.php",{method:"POST",cache:"no-cache",redirect:"follow"}).then(e=>e.json()).then(e=>{console.log(e),e.hasOwnProperty("reload")&&"yes"==e.reload&&(sessionStorage.setItem("litespeed_docref",document.referrer),window.location.reload(!0))});</script></body>

Add HTML Elements Into DOM. Let’s make Calculator Structure.

					<div class="container">
        <form action="" name="calc" class="calculator">
          <input type="text" class="value" readonly name="txt" />
          <span class="num clear" onclick="calc.txt.value=''"><i>C</i></span>
          <span class="num" onclick="calc.txt.value+='/'"><i>/</i></span>
          <span class="num" onclick="calc.txt.value+='*'"><i>*</i></span>
          <span class="num" onclick="calc.txt.value+='7'"><i>7</i></span>
          <span class="num" onclick="calc.txt.value+='8'"><i>8</i></span>
          <span class="num" onclick="calc.txt.value+='9'"><i>9</i></span>
          <span class="num" onclick="calc.txt.value+='-'"><i>-</i></span>
          <span class="num" onclick="calc.txt.value+='4'"><i>4</i></span>
          <span class="num" onclick="calc.txt.value+='5'"><i>5</i></span>
          <span class="num" onclick="calc.txt.value+='6'"><i>6</i></span>
          <span class="num plus" onclick="calc.txt.value+='+'"><i>+</i></span>
          <span class="num" onclick="calc.txt.value+='1'"><i>1</i></span>
          <span class="num" onclick="calc.txt.value+='2'"><i>2</i></span>
          <span class="num" onclick="calc.txt.value+='3'"><i>3</i></span>
          <span class="num" onclick="calc.txt.value+='0'"><i>0</i></span>
          <span class="num" onclick="calc.txt.value+='00'"><i>00</i></span>
          <span class="num" onclick="calc.txt.value+='.'"><i>.</i></span>
      <span class="num equal" onclick="document.calc.txt.value=eval(calc.txt.value)"><i>=</i></span>

Now Time to Move on CSS For Attractive Design 

					* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Courier New", Courier, monospace;
  body {
    display: flex;
    height: 100vh;
    align-items: center;
    justify-content: center;
    background-color: #202020;
  .container {
    position: relative;
    min-width: 300px;
    min-height: 400px;
    padding: 40px 30px 30px;
    border-radius: 20px;
    box-shadow: 25px 25px 75px rgba(0, 0, 0, 0.25),
      10px 10px 70px rgba(0, 0, 0, 0.25), inset -5px -5px 15px rgba(0, 0, 0, 0.25),
      inset 5px 5px 15px rgba(0, 0, 0, 0.25);
  .container span {
    color: #fff;
    position: relative;
    display: grid;
    width: 80px;
    place-items: center;
    margin: 8px;
    height: 80px;
    background: linear-gradient(180deg, #2f2f2f, #3f3f3f);
    box-shadow: inset -8px 0 8px rgba(0, 0, 0, 0.15),
      inset 0 -8px 8px rgba(0, 0, 0, 0.25), 0 0 0 2px rgba(0, 0, 0, 0.75),
      10px 20px 25px rgba(0, 0, 0, 0.4);
    user-select: none;
    cursor: pointer;
    font-weight: 400;
    border-radius: 10px;

  .calculator span:active {
    filter: brightness(1.5);
  .calculator span::before {
    content: "";
    position: absolute;
    top: 3px;
    left: 4px;
    bottom: 14px;
    right: 12px;
    border-radius: 10px;
    background: linear-gradient(90deg, #2d2d2d, #4d4d4d);
    box-shadow: -5px -5px 15px rgba(0, 0, 0, 0.1),
    10px 5px 10px rgba(0, 0, 0, 0.15);
  border-left: 1px solid #0004;
  border-bottom: 1px solid #0004;
  border-top: 1px solid #0009;

  .calculator span i {
    position: relative;
    font-style: normal;
    font-size: 1.5em;
    text-transform: uppercase;
  .calculator {
    position: relative;
    display: grid;
  .calculator .value {
    position: relative;
    grid-column: span 4;
    height: 100px;
    width: calc(100% - 20px);
    left: 10px;
    border: none;
    outline: none;
    margin-bottom: 10px;
    border-radius: 10px;
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.75);
    text-align: right;
    padding: 10px;
    font-size: 2em;
  .calculator .clear {
    grid-column: span 2;
    width: 180px;
    background: #f00;
  .calculator .clear::before {
    background: linear-gradient(90deg, #d20000, #ffffff5c);
    border-left: 1px solid #fff4;
    border-bottom: 1px solid #fff4;
    border-top: 1px solid #fff4;
  .calculator .plus {
    grid-row: span 2;
    height: 180px;
  .calculator .equal {
    background: #2196f3;
  .calculator .equal::before {
    background: linear-gradient(90deg, #1479c9, #ffffff5c);
    border-left: 1px solid #fff4;
    border-bottom: 1px solid #fff4;
    border-top: 1px solid #fff4;

Explanation : 

<span class=”num equal” onclick=”document.calc.txt.value=eval(calc.txt.value)“><i>=</i></span>

Here we use evel function on ‘onClick’ Event that performs mathematical Operations.

What is eval() in js ??

eval() is a function in JavaScript that allows you to execute code that is represented as a string.

When you pass a string of code to eval() .it gets executed as if it were written directly into your JavaScript code. For example:

					let x = 10;
let y = 20;
let codeString = 'x + y';
let result = eval(codeString); // result will be 30


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