Nab Home Loan Repayment Calculator

let repaymentSteps = “”; const currencySymbol = “$”, fixedCurrency = “AUD”; function calculateRepayment(){ repaymentSteps=””; const loanAmount=parseFloat(document.getElementById(“loanAmount”).value); const interestRate=parseFloat(document.getElementById(“interestRate”).value)/100; const loanTerm=parseFloat(document.getElementById(“loanTerm”).value); if(isNaN(loanAmount)||isNaN(interestRate)||isNaN(loanTerm)||loanAmount<=0||interestRate<=0||loanTerm<=0){ alert("Please enter valid positive values for all fields."); return; } const monthlyInterestRate = interestRate / 12; const numberOfPayments = loanTerm * 12; const monthlyRepayment = loanAmount * monthlyInterestRate / (1 – Math.pow(1 + monthlyInterestRate, -numberOfPayments)); document.getElementById("monthlyRepayment").value = formatCurrency(monthlyRepayment); repaymentSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Interest Rate: ${(interestRate * 100).toFixed(2)}%
Loan Term: ${loanTerm} years

`; repaymentSteps += `Formula:
Monthly Repayment = Loan Amount × Monthly Interest Rate ÷ (1 – (1 + Monthly Interest Rate) ^ -Number of Payments)

`; repaymentSteps += `Result:
Monthly Repayment: ${formatCurrency(monthlyRepayment)}
`; repaymentSteps += `Tip: The longer your loan term, the lower your monthly repayments, but the more you pay in interest overall.`; if(document.getElementById(“calculationStepsRepayment”).style.display===”block”){ document.getElementById(“calculationStepsRepayment”).innerHTML = repaymentSteps; } } function resetCalculator(){ document.querySelectorAll(“#calculator input”).forEach(el=>el.value=””); repaymentSteps=””; document.getElementById(“calculationStepsRepayment”).innerHTML=”

Not calculated yet.

“; } function toggleRepaymentSteps(){ const s=document.getElementById(“calculationStepsRepayment”); const a=document.getElementById(“toggleArrowRepayment”); if(s.style.display===”none”||s.style.display===””){ s.style.display=”block”;a.style.transform=”rotate(180deg)”; s.innerHTML=repaymentSteps||”

Not calculated yet.

“; }else{s.style.display=”none”;a.style.transform=”rotate(0deg)”;} } function formatCurrency(n){return currencySymbol+n.toFixed(2)+” “+fixedCurrency;}