Web Winder Website Calculators: Free Calculators: Future Value Calculator

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Installation Instructions: Future Value Calculator

Terms of Use: You may install this Future Value Calculator on your site for free, so long as my copyright info remains embedded in the code and the link back to my website is visible on the page you install the calculator on. You will find a link to the installation page located just beneath the calculator on this page.
If you would like to purchase a license for the latest commercial grade (professional) version of this calculator, please visit our Commercial Calculator Center.
If you would simply like to use an upgraded version of this calculator for your own personal use, I invite you to try our ever-growing collection of consumer-oriented calculators on our free online calculator use website for consumer decision making, discovery, and learning.

Below are the instructions for installing the Future Value Calculator on your website:

Step #1: Select and copy the script from the following text box, then paste between the <HEAD> and </HEAD> tags of the page you are installing the calculator on.

//DO NOT REMOVE THIS COPYWRITE INFO!
//Future Value Calculator
//By Daniel C. Peterson
//Web Winder Website Services, 1997-2024  All Rights Reserved.
//Distribution, editing or reselling of this script is strictyly prohibited
//without expressed written permission from Daniel C. Peterson.
//For commercial grade (professional) versions of this and many other
//calculators, visit http://www.webwinder.com.

function checkNumber(input, min, max, msg)

{

msg = msg + " field has invalid data: " + input.value;

var str = input.value;

for (var i = 0; i < str.length; i++) {

var ch = str.substring(i, i + 1)

if ((ch < "0" || "9" < ch) && ch != '.') {

alert(msg);

return false;

}

var num = 0 + str

if (num < min || max < num) {

alert(msg + " not in range [" + min + ".." + max + "]");

return false;

}

input.value = str;

return true;

}

function computeField(input)

{

if (input.value != null && input.value.length != 0)

input.value = "" + eval(input.value);

computeForm(input.form);

}

function computeForm(form)

{

if ((form.payments.value == null || form.payments.value.length == 0) ||

(form.interest.value == null || form.interest.value.length == 0) ||

(form.principal.value == null || form.principal.value.length == 0)) {

return;

}

if (!checkNumber(form.payments, 1, 480, "# of payments") ||

!checkNumber(form.interest, .001, 99, "Interest") ||

!checkNumber(form.principal, 1, 10000000, "Principal")) {

form.fv.value = "Invalid";

return;

}

var i = form.interest.value;

if (i > 1.0) {

i = i / 100.0;

form.interest.value = i;

}

i /= 12;

var pow = form.principal.value;
    
    for (var j = 0; j < form.payments.value *12; j++)

pow = (pow * i) + (pow *1);

form.fv.value = pow
		
		form.totalint.value = (form.fv.value - form.principal.value)

}

function clearForm(form)

{

form.payments.value = "";

form.interest.value = "";

form.principal.value = "";

}

</script>

Step #2: Select and copy the following HTML form code, then paste in the desired location between the <BODY> and </BODY> tags of the page you are installing the calculator on.

<form method="POST">
<table BORDER="1" CELLSPACING="0" CELLPADDING="4">

<tr>
<td align="center" COLSPAN="5">
<font face='arial'><big><strong>Future Value Calculator</strong></big></font>
</td>
</tr>

<tr>
<td COLSPAN="5">
<font face='arial'><small>This calculator will show you the Forgone
Interest Earnings that will result after spending a given dollar amount on a
non-appreciating, non-necessary purchase.</small></font>

</td>
</tr>

<tr>
<td align="center"><font face='tahoma,arial'><small><strong>Dollar<br>Amount</strong></small><font></td>
<td align="center"><font face='tahoma,arial'><small><strong>Interest<br>Rate</strong></small><font></td>
<td align="center"><font face='tahoma,arial'><small><strong>Number of<br>Years</strong></small><font></td>
<td align="center"><font face='tahoma,arial'><small><strong>Future<br> Value</strong></small><font></td>
<td align="center"><font face='tahoma,arial'><small><strong>Interest<br>Earned</strong></small><font></td>
</tr>

<tr>
<td align="center"><input TYPE="TEXT" NAME="principal" SIZE="9" onChange="computeField(this)"></td>
<td align="center"><input TYPE="TEXT" NAME="interest" SIZE="6" onChange="computeField(this)"></td>
<td align="center"><input TYPE="TEXT" NAME="payments" SIZE="5" onChange="computeField(this)"></td>
<td align="center"><input TYPE="TEXT" NAME="fv" SIZE="9" onChange="computeField(this)"></td>
<td align="center"><input TYPE="TEXT" NAME="totalint" SIZE="9" onChange="computeField(this)"></td>
</tr>

<tr>
<td align="center" COLSPAN="5">
<input TYPE="button" VALUE="Compute" onClick="computeForm(this.form)">
<input TYPE="reset" VALUE="Reset" onClick="clearForm(this.form)">
</td>
</tr>

<tr>
<td align="center" COLSPAN="5"><font face='tahoma,arial'><small><small>Copyright © 1997-2024<i> <a href='http://www.webwinder.com'>Web Winder Site Traffic Magnets</a></i>. All rights reserved.</small></small></font></td>
</tr>

</table>
</form>

Step #3: Edit the form HTML to match the look and feel of your site, then save and upload the page to your server and you're done!

**Please note that we do not provide support or installation help for the free versions of our calculators. We do provide support and installation help for our professional versions.

Home > Free Site Traffic Magnets > Free Calculators > Future Value Calculator Installation

Contact: Dan Peterson
P.O. Box 11
Bemidji, MN 56619
(218) 243-2263