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# How to Round Decimal Numbers in Javascript

###### Tutorialsrack 12/01/2022 Jquery Javascript

In this article, you’ll learn how to round decimal numbers in javascript. In Javascript, decimal numbers can be rounded using the `Number.``toFixed()` method and `Math.round()` method.

Let's say you have a decimal number like this.

``const number = 467.8945645672283838;``

## Example 1: Using toFixed() Method

The `Number.toFixed()` method takes an integer as input and returns the number as a string. In `Number.toFixed()` method, the parameter is optional, If you don't pass the parameter to `toFixed()` method, then only the integer part of the number is returned without the decimal part.

You can round the number to 2 decimal places by providing 2 as the parameter to the `toFixed()` method.

``````let number = 467.8945645672283838;
let num = Number(number.toFixed(2));

console.log(num);
// Output ==> 467.89
// Only 2 numbers after the decimal point is returned.``````

If you don't pass the parameter to the `toFixed()` method, then only the integer part of the number is returned without the decimal part. Let’s take an example:

``````const number = 467.8945645672283838;
const num = Number(number.toFixed());

console.log(num);
// Output ==> 468
// Only Rounded Number is returned,
// No decimal part is returned.``````

## Example 2: Using Math.Round() Method

The `Math.round()` function returns the value of a number rounded to the nearest integer.

• You can take the decimal number and add a very small number, `Number.EPSILON`, to ensure that the number rounding is accurate.
• Then, you can multiply by number with 100 before rounding to extract only the 2 digits after the decimal place. Finally, we divide the number by 100 to get a max of 2 decimal places.

Let’s take an example:

``````let number = 467.8945645672283838;

var rounded = Math.round((number + Number.EPSILON) * 100) / 100;
console.log(rounded);
// Output ==> 467.89
// Only 2 numbers after the decimal point is returned.
``````

If you want 3 digits after the decimal place, then replace the 100 with 1000 in the above code and the above code will return a number with 3 digits after the decimal place.

## Example 3: One More Better Approach to Round decimal Number

The decimal rounding problem can be avoided by using numbers represented in exponential notation:

``````let number = 467.8945645672283838;

//Function To  Round Decimal Number
//Parameters: num and decimals
//num ==> pass the Decimal Number,
//decimals == pass the digit you want round after decimal point
function roundDecimal(num, decimals) {
return Number(Math.round(num + "e" + decimals) + "e-" + decimals);
}

console.log(roundDecimal(number, 2));
// Output ==> 467.89
// Only 2 numbers after the decimal point is returned.
``````