Home Equity Loan Calculator Mortgage

let steps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculatePayment() { steps = “”; 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)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); steps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Interest Rate: ${(interestRate * 100 * 12).toFixed(1)}%
Loan Term: ${loanTerm / 12} years

`; steps += `Formula:
Monthly Payment = (Loan Amount × Interest Rate) / (1 – (1 + Interest Rate) ^ -Loan Term)

`; steps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
`; steps += `Tip: A longer loan term lowers monthly payments, but increases total interest paid over the life of the loan.`; if (document.getElementById(“calculationSteps”).style.display === “block”) { document.getElementById(“calculationSteps”).innerHTML = steps; } } function resetCalculator() { document.querySelectorAll(“#calculator input”).forEach(el => el.value = “”); steps = “”; document.getElementById(“calculationSteps”).innerHTML = “

Not calculated yet.

“; } function toggleSteps() { 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; }