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How to Format a Number to a Specific Number of Decimal Places in JavaScript

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How to Format a Number to a Specific Number of Decimal Places in JavaScript

In this article, we discuss how to use JavaScript's toFixed() method in order to format a number to a specific number of decimal places.

· Web Dev Zone ·
Free Resource

In this tutorial, we are going to learn about formatting a number to specific decimal places in JavaScript using the toFixed() method.

Consider that we have a number like this.

JavaScript




x


1
const num  = 123.1390;



Now, we need to format the above number according to specific decimal places like 123.12 or 123.139.

Using toFixed() Method

The toFixed() method formats a number and returns the string representation of a number. Be default the toFixed() method removes the fractional part.

It also accepts the optional argument called digits, which means we need to specify the number of digits after the decimal point.

Let’s see an example:

JavaScript




xxxxxxxxxx
1


1
const num  = 123.1390
2
 
          
3
            // fractional part is removed
4
console.log(num.toFixed()); // "123"



You may also like: How JavaScript Actually Works: Part 1.

Now, you can see that our number is converted to a string representation. Because of this, we need to convert the string back to a number by adding + operator.

JavaScript




xxxxxxxxxx
1


1
console.log(+num.toFixed()); // 123



Formatting Number to Two Decimal places

To format a number to two decimal places we need to pass 2 as an argument to the toFixed() method.

JavaScript




xxxxxxxxxx
1


1
const num  = 123.1390
2
 
          
3
console.log(+num.toFixed(2)); // 123.13



Similarly, we can format a number according to our needs like this:

JavaScript




x
11


 
1
const num  = 123.1390
2
 
           
3
          // 1 decimal place
4
console.log(+num.toFixed(1)); // 123.1
5
 
           
6
          // 2 decimal places
7
console.log(+num.toFixed(2)); // 123.13
8
 
           
9
 
           
10
          // 3 decimal places
11
console.log(+num.toFixed(3)); // 123.139



Further Reading

Topics:
web dev ,javascript ,toFixed ,string ,number ,tutorial

Published at DZone with permission of Sai gowtham . See the original article here.

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