How do I convert file size to mb only in JavaScript?

Question

How do I convert file size to MB only in JavaScript, It comes back as a long INT sometimes and I would like to convert this to a MB instead of it showing bytes or kb.

If possible I would like too also make it show as result like this example("0.01MB"), if it is under the 1 MB.

How about just figuring out how many bytes there are in a megabyte (1 048 576) and use basic math to calculate the number you are looking for. Search for javascripts math methods and I'm sure you'll figure it out, it's pretty simple stuff. — adeneo, Dec 12 '11 at 08:11
@adeneo "pretty simple stuff" are famous last words. Something like fuzzy time ala jquery.timeago.js would be useful. — Leif Gruenwoldt, Jan 04 '12 at 20:44

score 78 · Answer 1 · answered Dec 12 '11 at 08:07

78

var sizeInMB = (sizeInBytes / (1024*1024)).toFixed(2);
alert(sizeInMB + 'MB');

answered Dec 12 '11 at 08:07

devnull69

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var sizeInMB = $([sizeInBytes]).map(function(){return (this/1024/1024).toFixed(2) })[0] – Tim Sylvester Jan 28 '12 at 23:52
Also check out [Correct way to convert size in bytes to KB, MB, GB in Javascript](http://stackoverflow.com/questions/15900485/correct-way-to-convert-size-in-bytes-to-kb-mb-gb-in-javascript) – Eugene van der Merwe Mar 17 '16 at 08:31

score 16 · Answer 2 · answered Aug 25 '19 at 22:09

Javscript ES5 or earlier:

function bytesToMegaBytes(bytes) { 
  return bytes / (1024*1024); 
}

Javscript ES6 (arrow functions):

const bytesToMegaBytes = bytes => bytes / (1024*1024);

If you want to round to exactly digits after the decimal place, then:

function (bytes, roundTo) {
  var converted = bytes / (1024*1024);
  return roundTo ? converted.toFixed(roundTo) : converted;
}

In E6 or beyond:

const bytesToMegaBytes = (bytes, digits) => roundTo ? (bytes / (1024*1024)).toFixed(digits) : (bytes / (1024*1024));

Details on Number.prototype.toFixed().
Below you can view file size conversion table, for future help. Conversion table

score 2 · Answer 3 · answered Nov 18 '22 at 04:58

Only to MB + Multipurpose bytes converter to KB, MB, GB

function byteConverter( bytes, decimals, only) {
    const K_UNIT = 1024;
    const SIZES = ["Bytes", "KB", "MB", "GB", "TB", "PB"];

    if(bytes== 0) return "0 Byte";
  
    if(only==="MB") return (bytes / (K_UNIT*K_UNIT)).toFixed(decimals) + " MB" ;
  
    let i = Math.floor(Math.log(bytes) / Math.log(K_UNIT));
    let resp = parseFloat((bytes / Math.pow(K_UNIT, i)).toFixed(decimals)) + " " + SIZES[i];
  
    return resp;
}


let bytesInput = 2100050090;
console.log(byteConverter(bytesInput, 2));
console.log(byteConverter(bytesInput, 2, "MB" ));

How do I convert file size to mb only in JavaScript?

3 Answers3