The JavaScript Source: Math Related : Compounding Interest Calculator

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Compounding Interest Calculator

This compounding interest calculator can show your visitors how much they can save for retirement or other purpose. It also provides your users with the ability of viewing an amortization schedule showing what they will earn during each month. You can easily adjust the style section to make it match your site's color scheme.

Compounding Interest Calculator

Initial Deposit Amount: $
Monthly Contribution: $
Assumed Annual Return:	%
Number of years:

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The JavaScript Source: Math Related : Compounding Interest Calculator
Simply click inside the window below, use your cursor to highlight the script, and copy [Control]+C the script into a new file in your text editor (such as Note Pad) and save [Control+S]. The script is yours!!!

 .ddCalc{border:1px solid black;} .ddCalc TH{background-color:#BBBBBB;} .ddCalc TD{background-color:#DDDDDD;} .ddCalc A:link, .ddCalc a:hover, .ddCalc a:active, .ddCalc a:visited {color:#990000;}  /* This script and many more are available free online at The JavaScript Source :: http://javascript.internet.com Created by: Jeremy Zongker :: http://www.destroydebt.com/ */ function ddCalc(showAmort) { if (document.getElementById('ddInitialDeposit').value=='') {alert('Please enter an initial deposit amount.'); return;} if (document.getElementById('ddContribution.value')=='') {alert('Please enter a monthly contribution amount.'); return;} if (document.getElementById('ddRate.value')=='') {alert('Please enter an assumed rate of return.'); return;} if (document.getElementById('ddYears.value')=='') {alert('Please enter either the number of years.'); return;} var mRate=(document.getElementById('ddRate').value/100)/12; var maxMonths=999999; var maxAmount=99999999999; if (document.getElementById('ddYears').value!='') maxMonths=document.getElementById('ddYears').value*12; var amort='<table width=100% cellpadding=2 cellspacing=0 border=1 style="text-align:right;"><tr><th>Month</th><th>Contributions</th><th>Interest</th><th>Total</th></tr>'; //Get a decimal var currentAmount=0.1-0.1; var currentContributions=0.1-0.1; var currentInterest=0.1-0.1; currentAmount+=document.getElementById('ddInitialDeposit').value currentContributions+=document.getElementById('ddInitialDeposit').value; var monthlyAmount=Number(document.getElementById('ddContribution').value); var currentMonth=0; while (currentMonth<maxMonths && currentAmount<maxAmount) { currentMonth++; var interest=Number(currentAmount)*Number(mRate); currentInterest=Number(currentInterest) + Number(interest); currentContributions=Number(currentContributions) + monthlyAmount; currentAmount=Number(currentAmount)+Number(interest)+monthlyAmount; amort+='<tr><td>' + currentMonth + '</td><td>$' + Number(currentContributions).toFixed(2) + '</td><td>$' + Number(currentInterest).toFixed(2) + '</td><td>$' + Number(currentAmount).toFixed(2) + '</td></tr>'; } document.getElementById('ddResult').innerHTML="With an initial deposit of $" + Number(document.getElementById('ddInitialDeposit').value).toFixed(2) + ", monthly contributions of $" + monthlyAmount.toFixed(2) + " and an assumed annual interest rate of " + document.getElementById('ddRate').value + "% for " + Number(currentMonth)/12 + " years, you will earn a total of $" + Number(currentAmount).toFixed(2) + "."; if (showAmort) { document.getElementById('ddResult').innerHTML+='<BR><BR><B>Amortization Schedule</B><BR><div style="overflow: scroll;height: 200px;">' + amort + '</table></div>'; } else { document.getElementById('ddResult').innerHTML+=' <p align="center"><a href="javascript:ddCalc(true);">Show Amortization</a></p>'; } }  <script type="text/javascript" src="calcAmort.js"></script>  <table class="ddCalc" border=0 cellpadding=0 cellspacing=0 width=400 align="center"> <tr><th>Compounding Interest Calculator</th></tr> <tr><td align=center> <table cellpadding=2 cellspacing=0> <tr><td align="right">Initial Deposit Amount: $</td><td><input size=6 type=text id="ddInitialDeposit"></td></tr> <tr><td align="right">Monthly Contribution: $</td><td><input size=6 type=text id="ddContribution"></td></tr> <tr><td align="right">Assumed Annual Return: </td><td><input size=6 type=text id="ddRate">%</td></tr> <tr><td align="right">Number of years: </td><td><input size=6 type=text id="ddYears"></td></tr> <tr><td colspan=2 align="center"><input type=button value="Calculate" onclick="ddCalc(false);"></td></tr> <tr><td colspan=2 align="center" id="ddResult"></td></tr> </table> </td></tr> <tr><td align=right valign=top style="font-weight:bold;font-size:8pt;">Powered by:<a href="http://www.destroydebt.com/" target="_blank"><img src="http://www.destroydebt.com/images/logosmall.png" border="0" alt="debt help"></a></td></tr> </table> <p><div align="center"> <font face="arial, helvetica" size"-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </div><p>
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