Format number to always show 2 decimal places

Question

I would like to format my numbers to always display 2 decimal places, rounding where applicable.

Examples:

number     display
------     -------
1            


        

Answer 1

function number_format(string,decimals=2,decimal=',',thousands='.',pre='R$ ',pos=' Reais'){
  var numbers = string.toString().match(/\d+/g).join([]);
  numbers = numbers.padStart(decimals+1, "0");
  var splitNumbers = numbers.split("").reverse();
  var mask = '';
  splitNumbers.forEach(function(d,i){
    if (i == decimals) { mask = decimal + mask; }
    if (i>(decimals+1) && ((i-2)%(decimals+1))==0) { mask = thousands + mask; }
    mask = d + mask;
  });
  return pre + mask + pos;
}
var element = document.getElementById("format");
var money= number_format("10987654321",2,',','.');
element.innerHTML = money;

#format{
display:inline-block;
padding:10px;
border:1px solid #ffffd;
background:#f5f5f5;
}

<div id='format'>Test 123456789</div>

Answer 2

var num = new Number(14.12);
console.log(num.toPrecision(2));//outputs 14
console.log(num.toPrecision(3));//outputs 14.1
console.log(num.toPrecision(4));//outputs 14.12
console.log(num.toPrecision(5));//outputs 14.120

Answer 3

Here's also a generic function that can format to any number of decimal places:

function numberFormat(val, decimalPlaces) {

    var multiplier = Math.pow(10, decimalPlaces);
    return (Math.round(val * multiplier) / multiplier).toFixed(decimalPlaces);
}

Answer 4

This answer will fail if value = 1.005.

As a better solution, the rounding problem can be avoided by using numbers represented in exponential notation:

Number(Math.round(1.005+'e2')+'e-2'); // 1.01

Cleaner code as suggested by @Kon, and the original author:

Number(Math.round(parseFloat(value + 'e' + decimalPlaces)) + 'e-' + decimalPlaces)

You may add toFixed() at the end to retain the decimal point e.g: 1.00 but note that it will return as string.

Number(Math.round(parseFloat(value + 'e' + decimalPlaces)) + 'e-' + decimalPlaces).toFixed(decimalPlaces)

Credit: Rounding Decimals in JavaScript

Answer 5

Just run into this one of longest thread, below is my solution:

parseFloat(Math.round((parseFloat(num * 100)).toFixed(2)) / 100 ).toFixed(2)

Let me know if anyone can poke a hole

Answer 6

Are you looking for floor?

var num = 1.42482;
var num2 = 1;
var fnum = Math.floor(num).toFixed(2);
var fnum2 = Math.floor(num2).toFixed(2);
alert(fnum + " and " + fnum2); //both values will be 1.00