# Is there a way to round numbers into a reader friendly format? (e.g. \$1.1k) [closed]

Much like the Stackoverlow reputation rounding, I'm hoping to do the same thing with currency

\$1,000 => 1k

\$1,000,000 => 1m

How can I achieve this in JavaScript (preferably in jQuery)?

## Answers:

Here is a simple function to do it:

``````function abbrNum(number, decPlaces) {
// 2 decimal places => 100, 3 => 1000, etc
decPlaces = Math.pow(10,decPlaces);

// Enumerate number abbreviations
var abbrev = [ "k", "m", "b", "t" ];

// Go through the array backwards, so we do the largest first
for (var i=abbrev.length-1; i>=0; i--) {

// Convert array index to "1000", "1000000", etc
var size = Math.pow(10,(i+1)*3);

// If the number is bigger or equal do the abbreviation
if(size <= number) {
// Here, we multiply by decPlaces, round, and then divide by decPlaces.
// This gives us nice rounding to a particular decimal place.
number = Math.round(number*decPlaces/size)/decPlaces;

// Handle special case where we round up to the next abbreviation
if((number == 1000) && (i < abbrev.length - 1)) {
number = 1;
i++;
}

// Add the letter for the abbreviation
number += abbrev[i];

// We are done... stop
break;
}
}

return number;
}
``````

Outputs:

``````abbrNum(12 , 1)          => 12
abbrNum(0 , 2)           => 0
abbrNum(1234 , 0)        => 1k
abbrNum(34567 , 2)       => 34.57k
abbrNum(918395 , 1)      => 918.4k
abbrNum(2134124 , 2)     => 2.13m
abbrNum(47475782130 , 2) => 47.48b
``````
``````var pow = Math.pow, floor = Math.floor, abs = Math.abs, log = Math.log;
var abbrev = 'kmb'; // could be an array of strings: [' m', ' Mo', ' Md']

function round(n, precision) {
var prec = Math.pow(10, precision);
return Math.round(n*prec)/prec;
}

function format(n) {
var base = floor(log(abs(n))/log(1000));
var suffix = abbrev[Math.min(2, base - 1)];
base = abbrev.indexOf(suffix) + 1;
return suffix ? round(n/pow(1000,base),2)+suffix : ''+n;
}
``````

Demo:

``````> tests = [-1001, -1, 0, 1, 2.5, 999, 1234,
1234.5, 1000001, Math.pow(10,9), Math.pow(10,12)]
> tests.forEach(function(x){ console.log(x,format(x)) })

-1001 "-1k"
-1 "-1"
0 "0"
1 "1"
2.5 "2.5"
999 "999"
1234 "1.23k"
1234.5 "1.23k"
1000001 "1m"
1000000000 "1b"
1000000000000 "1000b"
``````

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