June 29, 2020

How to Round Off Numbers to 2 Decimal Places in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to round off numbers to 2 decimal places in javascript. It is pretty much common to round off a number to certain decimal places for the sake of readability. For instance, if you want to display a currency, then you will round it off to 2 decimal places.

In the following example, we will simply round off 123.788975488 to 2 decimal places and display it on the screen. We are going to use the toFixed() method to achieve it easily. To access the toFixed() method, a variable should be of number type.

toFixed() method simply takes one optional parameter where you can specify the number of digits to appear after the decimal. In case, you do not pass any parameter, it will be treated as 0. Please have a look over the code example and steps given below.

HTML & CSS

We have 3 elements in the HTML file (div, button, and h1). The div element is just a wrapper for the rest of the elements.
We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
We have also included our javascript file script.js with a script tag at the bottom.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    
    <div>
        <button>Get</button>
        <h1>Result</h1>
    </div>
    
    <script src="script.js"></script>
</body>
</html>

body {
    text-align: center;
}

div {
    display: inline-block;
}

button{
    display:inline-block;
    padding: 10px 20px;
}

Javascript

We have selected 2 elements (button and h1) using the document.querySelector() method and stored them in btn and result variables.
We have created a global variable num and assigned 123.788975488 as a value.
We have added a click event listener to the button element.
We are executing the toFixed() method and passing 2 as a parameter. The output will be 123.79 which will be displayed on the screen inside h1 element.

let btnGet = document.querySelector('button');
let result = document.querySelector('h1');

let num = 123.788975488;

btnGet.addEventListener('click', () => {
    result.innerText = num.toFixed(2);
});

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