shortenNumber.js

// from http://stackoverflow.com/questions/18151877/javascript-shorten-large-numbers-force-decimal-places-and-choose-to-represent

function shortenNumber (num, decimalPlaces) {
var str,
    suffix = '';

decimalPlaces = decimalPlaces || 0;
num = +num;

var factor = Math.pow(10, decimalPlaces);


//99999 -> 99.9K

if (num < 1000) {
    str = num;
} else if (num < 1000000) {
    str = Math.floor(num / (1000 / factor)) / factor;
    suffix = 'K';
} else if (num < 1000000000) {
    str = Math.floor(num / (1000000 / factor)) / factor;
    suffix = 'M';
} else if (num < 1000000000000) {
    str = Math.floor(num / (1000000000 / factor)) / factor;
    suffix = 'B';
} else if (num < 1000000000000000) {
    str = Math.floor(num / (1000000000000 / factor)) / factor;
    suffix = 'T';
}
return str + suffix;
}