Calculator

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); pmnt = '' + (form.principal.value * pow * i) / (pow - 1); pmntFds = pmnt.split("."); pmnt = pmntFds[0]; if ( pmntFds[1] ) { len = pmntFds[1].length; if ( len > 2 ) { pmnt += '.' + pmntFds[1].substr(0,2); } else { pmnt += '.' + pmntFds[1]; } } form.payment.value = pmnt; } function clearForm(form) { form.payments.value = ""; form.interest.value = ""; form.principal.value = ""; } function doit(x){ x.form1.principal.value=""; x.form1.interest.value="0.8"; x.form1.payments.value="2"; computeForm(x.form1); }

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Payment Calculator

We are helping the people of Duluth , Roswell and Alpharetta , Georgia to rebuild their Calculate for the past several years. If you have had Calculate problems in the past, or currently going through one then we can help you re-establish yourself and provide you with an excellent finance/lease program.

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