Convert numbers question

Hi,

I want to be able to convert my KB numbers.

For example the out put I am after lets say if my string is 471858 KB/MB then I would like it to change be able to echo to 0.04 GB

I can't seem to get it to work for round($count, 1)

What would be best way. I have tried some kb to gb converter script  like but does not convert it to like 0.04GB

PHP Code:

  function byte_convert($size) {
        # size smaller then 1kb
        if ($size < 1024) return $size . ' Byte';
        # size smaller then 1mb
        if ($size < 1048576) return sprintf("%4.2f KB", $size/1024);
        # size smaller then 1gb
        if ($size < 1073741824) return sprintf("%4.2f MB", $size/1048576);
        # size smaller then 1tb
        if ($size < 1099511627776) return sprintf("%4.2f GB", $size/1073741824);
        # size larger then 1tb
        else return sprintf("%4.2f TB", $size/1073741824);
    } 


PHP Code:

$quota = imap_get_quotaroot($mbox, "INBOX");

$message = $quota['MESSAGE'];

$percentage = ($count / $message['limit']) * 100;

echo round($count, 1) . " (" . round($percentage) . "%) of " . $this->byte_convert($message['limit']) . " used";