Rounding numbers to 2 digits after comma

Question

I have no idea how to do this  I m adding comma numbers  result is of course always a number with way too many digits after the comma  anyone

User · Answer

Though we have many answers here with plenty of useful suggestions, each of them still misses some steps.
So here is a complete solution wrapped into small function:

function roundToTwoDigitsAfterComma(floatNumber) {
    return parseFloat((Math.round(floatNumber * 100) / 100).toFixed(2));
}

Just in case you are interested how this works:

Multiple with 100 and then do round to keep precision of 2 digits after comma
Divide back into 100 and use toFixed(2) to keep 2 digits after comma and throw other unuseful part
Convert it back to float by using parseFloat() function as toFixed(2) returns string instead

Note: If you keep last 2 digits after comma because of working with monetary values, and doing financial calculations keep in mind that it's not a good idea and you'd better use integer values instead.

User · Answer

This is not really CPU friendly  but     Math round number 100  100   works as expected

User · Answer

I use this    x000D   x000D  function round value  precision    x000D   x000D   if precision    0  x000D    return Math round value      x000D   x000D   exp   1  x000D   for i 0 i lt precision i    x000D    exp    10  x000D   x000D   return Math round value exp  exp  x000D    x000D   x000D   x000D

User · Answer

This worked for me   var new number   float toFixed 2     Example   var my float   0 6666  my float toFixed 3      gt  0 667

User · Answer

use the below code   alert   Math round number    e 2       e-2

User · Answer

UPDATE  Keep in mind  at the time the answer was initially written in 2010  the bellow function toFixed   worked slightly different  toFixed   seems to do some rounding now  but not in the strictly mathematical manner  So be careful with it  Do your tests    The method described bellow will do rounding well  as mathematician would expect    toFixed   - method converts a number into a string  keeping a specified number of decimals  It does not actually rounds up a number  it truncates the number  Math round n  - rounds a number to the nearest integer  Thus turning    0 5 -  1   0 05 -  0  so if you want to round  say number 0 55555  only to the second decimal place  you can do the following this is step-by-step concept     0 55555   100   55 555   Math Round 55 555  -  56 000 56 000   100   0 56000    0 56000  toFixed 2  -  0 56   and this is the code    Math round number   100  100  toFixed 2

User · Answer

Previous answers forgot to type the output as an Number again  There is several ways to do this  depending on your tastes    my float toFixed 2   Number my float toFixed 2    parseFloat my float toFixed 2

User · Answer

EDIT 2  Use the Number object s toFixed method like this  var num   Number 0 005     The Number   only visualizes the type and is not needed var roundedString   num toFixed 2   var rounded   Number roundedString      toFixed   returns a string  often suitable for printing already   It rounds 42 0054321 to 42 01 It rounds 0 005 to 0 01 It rounds -0 005 to -0 01  So the absolute value increases on rounding at  5 border  jsFiddle example

[javascript] Rounding numbers to 2 digits after comma

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