javascript rounding numbers to two decimal places

Question

can someone let me know how I can achieve this type of rounding in javascript:

95.123 => 95.13
95.120 => 95.12
95.129 => 95.13
124.121 => 124.13

Thanks for the help.

A

How does `95.123` get “rounded” to `95.13` and `124.121` to `124.13`? — Sebastian Simon, Aug 16 '18 at 16:29
What have you tried already? Why are you rounding like this? Context is essential in answering your question. [How do I ask a good question?](https://stackoverflow.com/help/how-to-ask) — brae, Aug 16 '18 at 16:30
If you are rounding only for display purposes, use `toFixed()`: https://stackoverflow.com/questions/3163070/javascript-displaying-a-float-to-2-decimal-places — Code-Apprentice, Aug 16 '18 at 19:16

Karan · Answer 1 · 2018-08-16T16:41:42.837

1

Use Math.ceil(num * 100) / 100

console.log(Math.ceil(95.123 * 100) / 100);
console.log(Math.ceil(95.120 * 100) / 100);
console.log(Math.ceil(95.129 * 100) / 100);
console.log(Math.ceil(124.121 * 100) / 100);

edited Aug 16 '18 at 16:41

answered Aug 16 '18 at 16:36

Karan

12,059
3
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Thank you Karan, exactly what I was looking for. – jay4116 Aug 22 '18 at 23:21

Hristo · Answer 2 · 2018-08-16T16:58:46.693

A quick and easy way is to multiply by 100, round, and divide by 100.

let value = 95.123;
let rounded = Math.round(value * 100) / 100;

Another option is to use Number.toFixed() (be careful here, as toFixed() returns a string, not a number).

let value = 95.123;
let rounded = Number((value).toFixed(2));

A slightly more fancy approach would be to use exponential notation.

let value = 95.123;
let rounded = Number(Math.round(value+'e2')+'e-2');

This can be refactored into a helper function to handle different decimal values.

function roundToDec(value, decimals) {
  let posExp = 'e' + decimals;
  let negExp = 'e-' + decimals;
  return Number(Math.round(value + posExp) + negExp);
}

let value = 95.123;
let rounded = roundToDec(value, 2);

javascript rounding numbers to two decimal places

2 Answers2