NAB Personal Car Loan Calculator
function calculateNabCarLoan() {
const loanAmount = parseFloat(document.getElementById(‘loanAmount’).value);
const loanTerm = parseInt(document.getElementById(‘loanTerm’).value);
const interestRate = parseFloat(document.getElementById(‘interestRate’).value);
if (isNaN(loanAmount) || isNaN(loanTerm) || isNaN(interestRate) || loanAmount <= 0 || loanTerm <= 0 || interestRate <= 0) {
alert('Please enter valid values for all fields.');
return;
}
const monthlyInterestRate = interestRate / 100 / 12;
const numberOfPayments = loanTerm * 12;
const monthlyPayment = loanAmount * monthlyInterestRate / (1 – Math.pow(1 + monthlyInterestRate, -numberOfPayments));
if (isFinite(monthlyPayment)) {
document.getElementById('monthlyPayment').value = monthlyPayment.toFixed(2);
} else {
alert('Error in calculating monthly payment.');
}
}
