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(function($){ function calculateMortgage(principle, years, interest_rate){ var rate = interest_rate / 12; // monthly rate var number_payments = years * 12; var numerator = rate * Math.pow(1 + rate, number_payments); var denominator = Math.pow(1 + rate, number_payments) - 1; return principle * numerator / denominator; } function refi_calculator() { var principle = Number($('input[name="refi--home-price"]').val()); var interest = Number($('input[name="refi--interest"]').val()) / 100; var loanTerm = Number($('select[name="refi--loan-type"]').val()); var monthly = calculateMortgage(principle, loanTerm, interest); var mortgage = monthly.toFixed(2); var loanAmount = $('[name="refi--new-amount"]').val(); var refiFees = $('[name="refi--fees"]').val(); var cost = Number(loanAmount) + Number(refiFees); var newInterest = Number($('[name="refi--new-interest"]').val()) / 100; var newTerm = Number($('[name="refi--new-term"').val()); var monthly2 = calculateMortgage(cost, newTerm, newInterest); var refi = monthly2.toFixed(2); var saved = mortgage - refi; $('.calc--result').fadeIn(); $(".monthly").text("$" + saved.toFixed(2)) } $(document).on('click', '.calculate--refi', function(){ refi_calculator(); }); })(jQuery);