How to Truncate Number to 2 Decimal Places in Javascript

In this tutorial, you will learn how to truncate number to 2 decimal places in javascript. It is pretty much common to truncate a number to 2 decimal places for the sake of readability.  For a newbie developer, it can be a bit tricky to truncate a number to 2 decimal places.

There are numerous ways to truncate a number to 2 decimal places. We are going to use the simplest approach which involves the usage of the toFixed() method. It converts the number to string and rounds it to a specified number of decimals.

In the following example, we have one global variable that holds a number. Upon click of a button, we will truncate the number to 2 decimal places and display the result on the screen. Please have a look over the code example and the steps given below.

  • 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 548.9253 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 548.93 which will be displayed on the screen inside h1 element.
let btnGet = document.querySelector('button');
let result = document.querySelector('h1');

let num = 548.9253;

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