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Most developer languages give you a file's size in bytes. With these methods you can convert them to readable amounts and units.

PHP

<?php
 
echo friendly_filesize(45056).'<br />'; // 44 kB
echo friendly_filesize(1490944).'<br />'; // 1.4 MB
echo friendly_filesize(24022183936); // 22.4 GB
 
function friendly_filesize($bytes) {
	$measurements = array('TB'=>1099511627776, 'GB'=>1073741824, 'MB'=>1048576, 'kB'=>1024, 'b'=>1);
	foreach($measurements as $key=>$value) {
		$conv = $bytes/$value;
		if($conv > 1) {
			return round($conv, 1)." $key";
		}
	}
}
 
?>

JavaScript

<script type="text/javascript">
function friendly_filesize(bytes) {
	var labels = new Array('TB', 'GB', 'MB', 'kB', 'b');
	var measurements = new Array(1099511627776, 1073741824, 1048576, 1024, 1);
	for(var i=0; i<measurements.length; i++) {
		var conv = bytes/measurements[i];
		if(conv > 1) {
			return Math.round(conv*10)/10+' '+labels[i];
		}
	}
}
</script>
 
<p id="filesize"><script type="text/javascript">document.write(friendly_filesize(24022183936));</script></p>