sizeCount.js

var prefixes = [ "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" ];

const GROUP = 1024;

function binaryUnitFormat(x, unit) {
    var index = 0;
    var xnew = x;
    
    while (xnew >= GROUP && index < prefixes.length - 1) {
        xnew /= GROUP;
        index++;
    }
    
    var result = {};
    result.mag = xnew;
    result.unit = prefixes[index] + unit;
    
    return result;
}

var count = 672635;
var unit = "B";
var formatted = binaryUnitFormat(count, unit);

print(count + " " + unit + " is about " + formatted.mag.toFixed(2) + " "
      + formatted.unit);