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Javascript to Convert Numbers to Any Currency in Words

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Javascript to convert number including fractions upto two decimal places to Dollar and Cent in words in US number format i.e. Billion, Million, Thousand, Hundred, tens, units and Cents. The script can convert any amount less than One hundred billion i.e. upto 99,999,999,999.99 and can be customised to any currency.

Demo

function Dollar(amount){
var words = new Array();
words[0] = 'zero';words[1] = 'One';words[2] = 'Two';words[3] = 'Three';words[4] = 'Four';words[5] = 'Five';words[6] = 'Six';words[7] = 'Seven';words[8] = 'Eight';words[9] = 'Nine';words[10] = 'Ten';words[11] = 'Eleven';words[12] = 'Twelve';words[13] = 'Thirteen';words[14] = 'Fourteen';words[15] = 'Fifteen';words[16] = 'Sixteen';words[17] = 'Seventeen';words[18] = 'Eighteen';words[19] = 'Nineteen';words[20] = 'Twenty';words[30] = 'Thirty';words[40] = 'Forty';words[50] = 'Fifty';words[60] = 'Sixty';words[70] = 'Seventy';words[80] = 'Eighty';words[90] = 'Ninety'; words[100] = 'One Hundred'; words[200] = 'Two Hundred'; words[300] = 'Three Hundred'; words[400] = 'Four Hundred'; words[500] = 'Five Hundred'; words[600] = 'Six Hundred'; words[700] = 'Seven Hundred'; words[800] = 'Eight Hundred'; words[900] = 'Nine Hundred';var op;
amount = amount.toString();
var atemp = amount.split('.');
var number = atemp[0].split(',').join('');
var n_length = number.length;
var words_string = '';
if(n_length <= 11){
var n_array = new Array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
var received_n_array = new Array();
for (var i = 0; i < n_length; i++){
received_n_array[i] = number.substr(i, 1);}
for (var i = 11 - n_length, j = 0; i < 11; i++, j++){
n_array[i] = received_n_array[j];}
for (var i = 0, j = 1; i < 11; i++, j++){
if(i == 0 || i == 3 || i == 6 || i == 9){
if(n_array[i] == 1){
n_array[j] = 10 + parseInt(n_array[j]);
n_array[i] = 0;}
}}
value = '';
for (var i = 0; i < 11; i++){
if(i == 0 || i == 3 || i == 6 || i == 9){
value = n_array[i] * 10;}
else if( i == 2 || i == 5 || i == 8){
value = n_array[i] * 100;} else {
value = n_array[i];}

if(value != 0){
words_string += words[value] + ' ';}
if((i == 1 && value != 0) && (n_array[i - 1] > 0)){
words_string += 'Billion ';}else if(( i == 1) && value != 0){
words_string += 'Biillion ';}
if((i == 4) && value == 0 && (n_array[i - 1] > 0 || n_array[i - 2] > 0)){
words_string += 'Million ';} else if(( i == 4) && value != 0){
words_string += 'Million ';}
if((i == 7) && value == 0 && (n_array[i - 1] > 0 || n_array[i - 2] > 0)){
words_string += 'Thousand ';} else if(( i == 7) && value != 0){
words_string += 'Thousand ';}}
words_string = words_string.split(' ').join(' ');}
return words_string;}

function DollarCent(n){ var cur=document.getElementById('cur').value;var frac=document.getElementById('frac').value;
nums = n.toString().split('.')
var whole = Dollar(nums[0])
if(nums[1]==null)nums[1]=0;
if(nums[1].length == 1 )nums[1]=nums[1]+'0';
if(nums[1].length> 2){nums[1]=nums[1].substring(2,length - 1)}
if(nums.length == 2){
if(nums[0]<=12){nums[0]=nums[0]*10} else {nums[0]=nums[0]};
var fraction = Dollar(nums[1])
if(whole=='' && fraction==''){op= 'Zero only';}
if(whole=='' && fraction!=''){op= frac+' ' + fraction + ' only';}
if(whole!='' && fraction==''){op=cur+' ' + whole + ' only';} 
if(whole!='' && fraction!=''){op=cur+' ' + whole + 'and '+frac+' ' + fraction + ' only';}
amt=document.getElementById('amt').value;
if(amt > 99999999999.99){op='Oops!!! The amount is too big to convert';}
if(isNaN(amt) == true ){op='Error : Amount in number appears to be incorrect. Please Check.';}
document.getElementById('op').innerHTML=op;}}
DollarCent(Math.round(document.getElementById('amt').value*100)/100);

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Updated : Dec 11, 2020