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Calculators >>> Compound Interest.

Use JavaScript to calculate compund interest. Warns about doubtful data.

Principal Rate Years



Amount Interest

Add the below code to the <body> section of your page:

<script language="javascript" type="text/javascript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
var princ;
var ratepc;
var years;
var rate;
var power;
function calcAmt(frm) {
princ = eval(frm.pr.value);
ratepc = eval(frm.rt.value);
years = eval(frm.yr.value);
rate = ratepc / 100;
power = Math.pow((1 + rate), years);
frm.amt.value = Math.round(princ * power * 100) / 100;
frm.inter.value = Math.round((frm.amt.value - princ) * 100) / 100;
}
function checkInput(frm) {
if (rate == 0 || rate > .3) {
window.alert ("Are you sure that the interest rate is " + ratepc +"%?");
frm.rt.focus();
}
if (years == 0 || years > 30) {
window.alert ("Are you sure that the term is " + years + " years?");
frm.yr.focus();
   }
}
//  End -->
</script>
<form method=get name=frm>
Principal <input type=text name=pr size=10 maxlength=10 onChange=calcAmt(this.form)>
Rate <input type=text name=rt size=6 maxlength=6 onChange=calcAmt(this.form)>
Years <input type=text name=yr size=5 maxlength=5 onChange=calcAmt(this.form)>
<br>
<
br>
<input type=button name=calc value="Calculate" size=10 onClick=checkInput(this.form); calcAmt(this.form);>
<input
type=reset value="Clear">
<br>
<
br>
Amount <input type=text name=amt size=10>
Interest <input type=text name=inter size=10>
</form>

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