Bpi House Loan Calculator

let steps = “”; const currencySymbol = “₱”, fixedCurrency = “PHP”; function calculateLoanPayment() { steps = “”; 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 positive values for all fields."); return; } const monthlyInterestRate = interestRate / 100 / 12; const numberOfPayments = loanTerm * 12; const monthlyPayment = (loanAmount * monthlyInterestRate) / (1 – Math.pow(1 + monthlyInterestRate, -numberOfPayments)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); steps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Loan Term: ${loanTerm} years
Interest Rate: ${interestRate}%

`; steps += `Formulas:
Monthly Payment = Loan Amount × Monthly Interest Rate ÷ (1 – (1 + Monthly Interest Rate)^(-Number of Payments))

`; steps += `Results:
Estimated Monthly Payment: ${formatCurrency(monthlyPayment)}
`; if (document.getElementById(“calculationSteps”).style.display === “block”) { document.getElementById(“calculationSteps”).innerHTML = steps; } } function resetLoanCalculator() { document.querySelectorAll(“#calculator input”).forEach(el => el.value = “”); steps = “”; document.getElementById(“calculationSteps”).innerHTML = “

Not calculated yet.

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

Not calculated yet.

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