Round a Number to 2 Decimal Places in JavaScript

John on November 24, 2021

To round a number to decimal places in Javascript, use either the .toFixed() or Math.round() function. In this tutorial we will learn how to use both methods.

Rounding a Number to 2 Decimal Places with .toFixed()

The .toFixed() function will round a number to a fixed number of decimal places. Pass the number to round before the function and the number of decimal places to round to as the first argument.

var num = 22.22434;
var num2 = 1.004

var res = num.toFixed(2);
console.log(res);

22.22

Note – This method will not work on numbers like 1.004.

Rounding a Number in JavaScript to 2 Decimal Places with Math.round()

To round numbers to 2 decimal places with improved accuracy, use the Math.round() function with the Number.EPSILON utility like this:

var num = 22.22434;

var res = Math.round((num + Number.EPSILON) * 100) / 100;

console.log(res);

22.22

Note – This method will not work on numbers like 1.004.

Round Numbers with Multiple 0's Decimal Places

The two previous methods will not round numbers like 1.005 to two decimal places accurately. To get around this, we will use the .toPrecision() function to remove rounding errors before getting the final result.

function round(num) {
   var m = Number((Math.abs(num) * 100).toPrecision(15));
   return Math.round(m) / 100 * Math.sign(num);
}

console.log(round(1.005));

1.01