A simple interest calculator in JavaScript I wrote a long time ago while teaching JavaScript programming in one of the colleges here in the Philippines.

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Program Listing


body,p {

    .container {
        width: 450px;
        clear: both;
    .container input {
        width: 100%;
        clear: both;

	<div class="container">
<h3> Simple Interest Calculator in JavaScript </h3>
<br/>Principal (P): Php
<input type="text" id="principal" name="principal">
<br/> Rate (R):
<input type="text" id="rate" name="rate">
<br/> Time (t):
<input type="text" id="time" name="time">
<button onclick="compute_interest()">Compute Interest</button>
<p id="demo"></p>

function Commas(n) {
    var parts=n.toString().split(".")
    return parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",") + (parts[1] ? "." + parts[1] : "");
  function compute_interest() {
    var  principal = document.getElementById("principal").value;
	var  rate = document.getElementById("rate").value;
	var  time = document.getElementById("time").value;
     rate2 = parseFloat(rate)/100;
	 amount_interest = parseFloat(principal) * (1+ (parseFloat(rate2)*time));
	 amt =amount_interest.toFixed(2);
	 display = Commas(amt);
	 results ="Amount to be paid is Php " + display+".";
      document.getElementById("demo").innerHTML = results;