Loan Comparison Calculator
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Below you will find a valuable resource for comparing loans that you may have looked in to, as well as a resource to tell you how much you need to save to attain a certain goal (amount of money). As long as you know the APR and the principal balance you would like to balance against, you can figure out which loan will be the better deal for you in the end.. //By Daniel C. Peterson //Web Winder Website Services, 1997-2006 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, 100, 10000000, "Principal")) { form.payment.value = "Invalid"; return; } var i = form.interest.value; if (i > 1.0) { i = i / 100.0; form.interest.value = i; } i /= 12; var pow = 1; for (var j = 0; j < form.payments.value; j++) pow = pow * (1 + i); form.payment.value = (form.principal.value * pow * i) / (pow - 1); form.totalint.value = (form.payment.value * form.payments.value) - form.principal.value } function clearForm(form) { form.payments.value = ""; form.interest.value = ""; form.principal.value = ""; }
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