# How to Round Off to 3 Decimal Places in Javascript

In this tutorial, you will learn how to round off to 3 decimal places in javascript. The decimal number has the whole number part and the fractional part where the fractional part is separated by a decimal point. For example, 41.55 is a decimal number where 41 is the whole number and 55 is the fractional part.

To round off any decimal number up to 3 decimal places, you can make use of the `toFixed()` method, but in different browsers, this method behaves differently and that is why we are going to create our custom method to accomplish the goal.

In the following example, we have an input field in which we will enter a random decimal number. Upon click of a button, we will round it off to 3 decimal places and display the decimal number on the screen.  Please have a look over the code example and the steps given below.

HTML & CSS

• We have 4 elements in the HTML file (`div`, `input`, `button`, and `h1`). The `div` element is just a wrapper for the rest of the elements.
• The `innerText` for the `button` element is `“Get”` and for the `h1` element, it is `“Result”`.
• 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 class="container">
<input type="number" placeholder="Enter Number">
<button>Get</button>
<h1>Result</h1>
</div>

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

</html>```
```.container {
text-align: center;
}

button {
margin-top: 10px;
padding: 10px 20px;
}

input {
display: block;
margin: 10px auto;
padding: 10px 20px;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
-webkit-appearance: none;
margin: 0;
}```

Javascript

• We have selected the `input` element, `button` element, and `h1` element using the `document.querySelector()` method and stored them in `input`, `btnGet`, and `output` variables respectively.
• We have attached a `click` event listener to the `button` element.
• In the event handler function, we are getting the value from the `input` element using `value` property and converting it into number type using the `Number()` method. The conversion result is stored in the `num` variable.
• We have created the `roundOff()` method which takes 2 parameters, `value` and `precision`. This method will be responsible for rounding off the decimal number.
• We are calling the `roundOff()` method and passing it `num` and 3 as parameters. The returned value will be stored in the `result` variable.
• We are displaying the `result` in the h1 element using the `innerText` property.
```let input = document.querySelector("input");
let btnGet = document.querySelector("button");
let output = document.querySelector("h1");

btnGet.addEventListener("click", () => {
let num = Number(input.value);
let result = roundOff(num, 3);
output.innerText = result;
});

function roundOff(value, precision) {
var multiplier = Math.pow(10, precision || 0);
return Math.round(value * multiplier) / multiplier;
}
```