How to Create Calculator in HTML, CSS, JS

By Piyush Gupta
Create Calculator piyush608

Creating a basic calculator involves creating a user interface with buttons for numbers and operations, and using JavaScript to handle the logic of calculations. Here’s a simple implementation:

HTML

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Aravind Kreshna - Calculator | JavaScript Mini Projects</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="calculator">
<input type="text" id="display" readonly>
<div id="keys">
<button onclick="appendToDisplay('+')" class="operator-btn">+</button>
<button onclick="appendToDisplay('7')">7</button>
<button onclick="appendToDisplay('8')">8</button>
<button onclick="appendToDisplay('9')">9</button>
<button onclick="appendToDisplay('-')"class="operator-btn">-</button>
<button onclick="appendToDisplay('4')">4</button>
<button onclick="appendToDisplay('5')">5</button>
<button onclick="appendToDisplay('6')">6</button>
<button onclick="appendToDisplay('*')"class="operator-btn">*</button>
<button onclick="appendToDisplay('1')">1</button>
<button onclick="appendToDisplay('2')">2</button>
<button onclick="appendToDisplay('3')">3</button>
<button onclick="appendToDisplay('/')"class="operator-btn">/</button>
<button onclick="appendToDisplay('0')">0</button>
<button onclick="appendToDisplay('.')">.</button>
<button onclick="calculate()">=</button>
<button onclick="clearDisplay()"class="operator-btn">C</button>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Aravind Kreshna - Calculator | JavaScript Mini Projects</title> <link rel="stylesheet" href="style.css"> </head> <body> <div id="calculator"> <input type="text" id="display" readonly> <div id="keys"> <button onclick="appendToDisplay('+')" class="operator-btn">+</button> <button onclick="appendToDisplay('7')">7</button> <button onclick="appendToDisplay('8')">8</button> <button onclick="appendToDisplay('9')">9</button> <button onclick="appendToDisplay('-')"class="operator-btn">-</button> <button onclick="appendToDisplay('4')">4</button> <button onclick="appendToDisplay('5')">5</button> <button onclick="appendToDisplay('6')">6</button> <button onclick="appendToDisplay('*')"class="operator-btn">*</button> <button onclick="appendToDisplay('1')">1</button> <button onclick="appendToDisplay('2')">2</button> <button onclick="appendToDisplay('3')">3</button> <button onclick="appendToDisplay('/')"class="operator-btn">/</button> <button onclick="appendToDisplay('0')">0</button> <button onclick="appendToDisplay('.')">.</button> <button onclick="calculate()">=</button> <button onclick="clearDisplay()"class="operator-btn">C</button> </div> </div> <script src="script.js"></script> </body> </html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Aravind Kreshna - Calculator | JavaScript Mini Projects</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div id="calculator">
        <input type="text" id="display" readonly>
        <div id="keys">
            <button onclick="appendToDisplay('+')" class="operator-btn">+</button>
            <button onclick="appendToDisplay('7')">7</button>
            <button onclick="appendToDisplay('8')">8</button>
            <button onclick="appendToDisplay('9')">9</button>
            <button onclick="appendToDisplay('-')"class="operator-btn">-</button>
            <button onclick="appendToDisplay('4')">4</button>
            <button onclick="appendToDisplay('5')">5</button>
            <button onclick="appendToDisplay('6')">6</button>
            <button onclick="appendToDisplay('*')"class="operator-btn">*</button>
            <button onclick="appendToDisplay('1')">1</button>
            <button onclick="appendToDisplay('2')">2</button>
            <button onclick="appendToDisplay('3')">3</button>
            <button onclick="appendToDisplay('/')"class="operator-btn">/</button>
            <button onclick="appendToDisplay('0')">0</button>
            <button onclick="appendToDisplay('.')">.</button>
            <button onclick="calculate()">=</button>
            <button onclick="clearDisplay()"class="operator-btn">C</button>
        </div>
    </div>

    <script src="script.js"></script>
</body>
</html>

 

CSS (styles.css)

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body{
margin: 0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: hsl(0, 0%, 90%);
}
#calculator{
font-family: Arial, sans-serif;
background-color: hsl(0, 0%, 15%);
border-radius: 15px;
max-width: 400px;
overflow: hidden;
}
#display{
width: 100%;
padding: 20px;
font-size: 5rem;
text-align: left;
border: none;
background-color: hsl(0, 0%, 25%);
color: white;
}
#keys{
display: grid;
grid-template-columns: repeat(4,1fr);
gap: 10px;
padding: 25px;
}
button{
width: 75px;
height: 75px;
border-radius: 50px;
border: none;
background-color: hsl(0, 0%, 30%);
color: white;
font-size: 3rem;
font-weight: bold;
cursor: pointer;
}
button:hover{
background-color: hsl(0, 0%, 40%);
}
button:active{
background-color: hsl(0, 0%, 50%);
}
.operator-btn{
background-color: hsl(35, 100%, 55%);
}
.operator-btn:hover{
background-color: hsl(35, 100%, 65%);
}
.operator-btn:active{
background-color: hsl(35, 100%, 75%);
}
body{ margin: 0; display: flex; justify-content: center; align-items: center; height: 100vh; background-color: hsl(0, 0%, 90%); } #calculator{ font-family: Arial, sans-serif; background-color: hsl(0, 0%, 15%); border-radius: 15px; max-width: 400px; overflow: hidden; } #display{ width: 100%; padding: 20px; font-size: 5rem; text-align: left; border: none; background-color: hsl(0, 0%, 25%); color: white; } #keys{ display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; padding: 25px; } button{ width: 75px; height: 75px; border-radius: 50px; border: none; background-color: hsl(0, 0%, 30%); color: white; font-size: 3rem; font-weight: bold; cursor: pointer; } button:hover{ background-color: hsl(0, 0%, 40%); } button:active{ background-color: hsl(0, 0%, 50%); } .operator-btn{ background-color: hsl(35, 100%, 55%); } .operator-btn:hover{ background-color: hsl(35, 100%, 65%); } .operator-btn:active{ background-color: hsl(35, 100%, 75%); }
body{
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: hsl(0, 0%, 90%);
}
#calculator{
    font-family: Arial, sans-serif;
    background-color: hsl(0, 0%, 15%);
    border-radius: 15px;
    max-width: 400px;
    overflow: hidden;
}
#display{
    width: 100%;
    padding: 20px;
    font-size: 5rem;
    text-align: left;
    border: none;
    background-color: hsl(0, 0%, 25%);
    color: white;
}
#keys{
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 10px;
    padding: 25px;
}
button{
    width: 75px;
    height: 75px;
    border-radius: 50px;
    border: none;
    background-color: hsl(0, 0%, 30%);
    color: white;
    font-size: 3rem;
    font-weight: bold;
    cursor: pointer;
}

button:hover{
    background-color: hsl(0, 0%, 40%);
}
button:active{
    background-color: hsl(0, 0%, 50%);
}
.operator-btn{
    background-color: hsl(35, 100%, 55%);
}
.operator-btn:hover{
    background-color: hsl(35, 100%, 65%);
}
.operator-btn:active{
    background-color: hsl(35, 100%, 75%);
}

 

JavaScript (script.js)

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const display = document.getElementById('display');
function appendToDisplay(input){
display.value += input;
}
function clearDisplay(){
display.value = "";
}
function calculate(){
try{
display.value = eval(display.value);
}
catch(error){
display.value = "Error"
}
}
const display = document.getElementById('display'); function appendToDisplay(input){ display.value += input; } function clearDisplay(){ display.value = ""; } function calculate(){ try{ display.value = eval(display.value); } catch(error){ display.value = "Error" } }
const display = document.getElementById('display');

function appendToDisplay(input){
    display.value += input;
}


function clearDisplay(){
    display.value = "";
}

function calculate(){
    try{
        display.value = eval(display.value);
    }
    catch(error){
        display.value = "Error"
    }
}

 

Explanation

  1. HTML:
    • The structure includes an input field for the display and buttons for the digits, operators, and actions.
    • Each button has a data-value attribute to store its value.
  2. CSS:
    • Basic styling for the calculator layout, including a grid layout for the buttons.
    • Different styles for number buttons, operator buttons, the equal button, and the clear button.
  3. JavaScript:
    • Event listeners are added to each button to handle the click event.
    • When a button is clicked, its value is appended to the display or an appropriate action (clear, calculate) is performed.

This setup provides a simple yet functional calculator. You can extend it further by adding more advanced features like keyboard support, scientific functions, or a more sophisticated UI.

CEO Piyush Gupta


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