Have max. 2 decimal places

Question

With .toFixed(2) I always get 2 decimals, even if the number is 2.00

Can I get "2" instead?

Example:

2.00 => 2
2.05 => 2.05
2.053435 => 2.05
2.057435 => 2.06

possible duplicate of [Round to at most 2 decimal places in JavaScript](http://stackoverflow.com/questions/11832914/round-to-at-most-2-decimal-places-in-javascript) — Vucko, Aug 26 '15 at 14:42
but that also suggets I use toFixed(2) which doesn't work like I want — Elfy, Aug 26 '15 at 14:43
So use the script from the most voted answer? Here's [your example](http://jsfiddle.net/af3qg9bc/) — Vucko, Aug 26 '15 at 14:46

MT0 · Accepted Answer · 2015-08-26T14:53:27.820

43

function toFixedIfNecessary( value, dp ){
  return +parseFloat(value).toFixed( dp );
}

console.log( toFixedIfNecessary( 1.999, 2 ));    // 2
console.log( toFixedIfNecessary( 2, 2 ));        // 2
console.log( toFixedIfNecessary( 2.1, 2 ));      // 2.1
console.log( toFixedIfNecessary( 2.05, 2 ));     // 2.05
console.log( toFixedIfNecessary( 2.05342, 2 ));  // 2.05
console.log( toFixedIfNecessary( 2.04999, 2 ));  // 2.05
console.log( toFixedIfNecessary( 2.04499, 2 ));  // 2.04
console.log( toFixedIfNecessary( 2.053435, 2 )); // 2.05
console.log( toFixedIfNecessary( 2.057435, 2 )); // 2.06

edited Aug 26 '15 at 14:53

answered Aug 26 '15 at 14:47

MT0

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3

What sworcery is this? Can someone explain why +parseFloat has this behaviour? – homebrand Dec 25 '17 at 08:33
4

@homebrand the + converts the string output of toFixed back to a float. Try `+"2.00"` in the console – Rani May 11 '19 at 15:47
1

This use case scenario is not covered: console.log( toFixedIfNecessary(0.000000032, 10 )); // 3.2e-8 – Geraldo B. Landre Aug 18 '21 at 05:49

baao · Answer 2 · 2015-08-26T15:22:54.453

2

You can use Math.round():

var number = 2.005;
var number2 = 2.558934;
var number3 = 1.005;

function round(value, decimals) {
    return Number(Math.round(value+'e'+decimals)+'e-'+decimals);
}

console.log(round(number, 2)) // > 2.01
console.log(round(number2, 2)) // > 2.56
console.log(round(number3, 2)) // > 1.01

edited Aug 26 '15 at 15:22

answered Aug 26 '15 at 14:46

baao

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`Math.round( 1.005 * 100 ) / 100` returns `1` – MT0 Aug 26 '15 at 14:49
1

And it should return 1, because we want maximum 2 decimal places, but if you input 1.05 it will return 1.05, or if we input 1.051264 it will return 1.05 – Neven Ignjic Aug 26 '15 at 14:56
3

@NevenIgnjic `1.005` to 2dp is `1.01` not `1` – MT0 Aug 26 '15 at 14:58
It depends, I came across two types of rounding when the input is at the half between to values it needs to snap. 1. Snap to higher or lower value 2. Snap to closest even or odd number So it all depends what kind of software is calculating this, but to the OP these things don't matter. – Neven Ignjic Aug 26 '15 at 15:01

Have max. 2 decimal places

2 Answers2