Home Loan Loan Repayment Calculator

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

`; calculationSteps += `Formulas:
Monthly Payment = Loan Amount × Interest Rate ÷ (1 – (1 + Interest Rate)^(-Term))
Total Repayment = Monthly Payment × Loan Term
Total Interest = Total Repayment – Loan Amount

`; calculationSteps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
Total Repayment: ${formatCurrency(totalRepayment)}
Total Interest: ${formatCurrency(totalInterest)}
`; if (document.getElementById(“calculationSteps”).style.display === “block”) { document.getElementById(“calculationSteps”).innerHTML = calculationSteps; } } function resetCalculator() { document.querySelectorAll(“#loan-repayment-calculator input”).forEach(el => el.value = “”); calculationSteps = “”; document.getElementById(“calculationSteps”).innerHTML = “

Not calculated yet.

“; } function toggleCalculationSteps() { const steps = document.getElementById(“calculationSteps”); const arrow = document.getElementById(“toggleArrow”); if (steps.style.display === “none” || steps.style.display === “”) { steps.style.display = “block”; arrow.style.transform = “rotate(180deg)”; steps.innerHTML = calculationSteps || “

Not calculated yet.

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