let loanSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateLoanDuration(){ loanSteps=””; const loanAmount = parseFloat(document.getElementById(“loanAmount”).value); const monthlyPayment = parseFloat(document.getElementById(“monthlyPayment”).value); const annualInterestRate = parseFloat(document.getElementById(“interestRate”).value) / 100; if(isNaN(loanAmount) || isNaN(monthlyPayment) || isNaN(annualInterestRate) || loanAmount <= 0 || monthlyPayment <= 0){ alert("Please enter valid positive values for all fields."); return; } const interestRatePerMonth = annualInterestRate / 12; const numberOfMonths = Math.ceil((Math.log(monthlyPayment / (monthlyPayment – loanAmount * interestRatePerMonth))) / Math.log(1 + interestRatePerMonth)); document.getElementById("loanTermResult").value = numberOfMonths; loanSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Monthly Payment: ${formatCurrency(monthlyPayment)}
Annual Interest Rate: ${(annualInterestRate * 100).toFixed(2)}%

`; loanSteps += `Formulas:
Months to Pay Off = log(Monthly Payment / (Monthly Payment – Loan Amount × Monthly Interest Rate)) / log(1 + Monthly Interest Rate)

`; loanSteps += `Results:
Loan Payoff Duration: ${numberOfMonths} months
`; loanSteps += `Tip: You can adjust your monthly payment to pay off the loan faster or to reduce the interest paid over time.`; if(document.getElementById(“calculationStepsLoan”).style.display === “block”){ document.getElementById(“calculationStepsLoan”).innerHTML = loanSteps; } } function resetLoanCalculator(){ document.querySelectorAll(“#calculator input”).forEach(el => el.value = “”); loanSteps = “”; document.getElementById(“calculationStepsLoan”).innerHTML = “

Not calculated yet.

“; } function toggleLoanSteps(){ const s = document.getElementById(“calculationStepsLoan”); const a = document.getElementById(“toggleArrowLoan”); if(s.style.display === “none” || s.style.display === “”){ s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = loanSteps || “

Not calculated yet.

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