MORTGAGE MINDER
Mortgage Data:
House Price:
Down Payment:
Annual Interest Rate: %
Term: Years
Results:
Mortgage Principle:
Total Payments:
Monthly Payment:

JavaScript Mortgage Calculator

This page uses a form to create a mortgage calculator, and then uses JavaScript (displayed below the calculator) to perform the actual calculations.

Here's how you use this form:

  1. Enter the House Price.
  2. Enter the Down Payment.
  3. Enter the Annual Interest Rate percentage.
  4. Enter the Term, in years.
  5. Click Calculate.
Here's the JavaScript:
<SCRIPT LANGUAGE="JavaScript">
<!--
    function checkForZero(field) {
        if (field.value == 0 || field.value.length == 0) {
            alert ("This field can't be 0!");
            field.focus(); }
        else
	    calculatePayment(field.form);
    }

    function cmdCalc_Click(form) {
        if (form.price.value == 0 || form.price.value.length == 0) {
            alert ("The Price field can't be 0!");
            form.price.focus(); }
        else if (form.ir.value == 0 || form.ir.value.length == 0) {
            alert ("The Interest Rate field can't be 0!");
            form.ir.focus(); }
        else if (form.term.value == 0 || form.term.value.length == 0) {
            alert ("The Term field can't be 0!");
            form.term.focus(); }
        else
            calculatePayment(form);
    }

    function calculatePayment(form) {
        princ = form.price.value - form.dp.value;
        intRate = (form.ir.value/100) / 12;
        months = form.term.value * 12;
        form.pmt.value = Math.floor((princ*intRate)/(1-Math.pow(1+intRate,(-1*months)))*100)/100;
  	form.principle.value = princ;
	form.payments.value = months;
    }
//-->
</SCRIPT>