Algorithm To Calculate Mortgage Payments..

Nov 2, 2004

Does anybody know of an algorithm to calculate mortgage payments? e.g.

Amount: 100,000
Interest Rate: 4.5%
Term: 25 Years

Monthly Payments: x

I've looked at other js scripts to do this but it seems alot more involved then I thought, and because they use non descriptive variable names I can't work any of them out..

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Calculate Mortgage Payment

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I'm trying to create a mortgage payment calculator in Javascript and am having problems. My algorithm seems correct but it's not giving the right results. Im using this code:

function do_calc_payment(){var term = document.calc_payment.term.value;var rate = document.calc_payment.rate.value;var amount = document.calc_payment.amount.value;var j = rate / (12*100);var m = term * 12;var payment = amount * ( j / (1 - (1 + j) ^ -m))var result = "$"+Math.round((payment)*1000)/1000;if(isNaN(payment)){document.calc_payment.rate.value="";document.calc_payment.amount.value="";result="Not a Number";}if(payment.length>=15){result="Max Characters";}document.getElementById('new_payment').innerHTML = result;}

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[Code]....

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[Code]...

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Jquery ( http://www.jquery.com/ )
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function mapmouse (obj) {
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[code]....

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[URL]

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