function calculateAmortization() {
const loanAmount = parseFloat(document.getElementById(‘loanAmount’).value);
const interestRate = parseFloat(document.getElementById(‘interestRate’).value) / 100 / 26; // biweekly periods
const loanTerm = parseFloat(document.getElementById(‘loanTerm’).value) * 26; // biweekly periods
if (isNaN(loanAmount) || isNaN(interestRate) || isNaN(loanTerm) || loanAmount <= 0 || interestRate <= 0 || loanTerm <= 0) {
alert("Please enter valid positive values.");
return;
}
const biweeklyPayment = (loanAmount * interestRate) / (1 – Math.pow(1 + interestRate, -loanTerm));
const totalInterest = (biweeklyPayment * loanTerm) – loanAmount;
const totalLoanCost = loanAmount + totalInterest;
document.getElementById('biweeklyPayment').value = biweeklyPayment.toFixed(2);
document.getElementById('totalInterest').value = totalInterest.toFixed(2);
document.getElementById('totalLoanCost').value = totalLoanCost.toFixed(2);
}
