Car Payment Calculator with 84 Months

let carPaymentSteps = “”; function calculateCarPayment(){ carPaymentSteps = “”; const loanAmount = parseFloat(document.getElementById(“loanAmount”).value); const interestRate = parseFloat(document.getElementById(“interestRate”).value) / 100; const loanTerm = 84; // Fixed loan term of 84 months if (isNaN(loanAmount) || isNaN(interestRate) || loanAmount <= 0 || interestRate < 0) { alert("Please enter valid positive values for all fields."); return; } const monthlyInterestRate = interestRate / 12; const monthlyPayment = loanAmount * (monthlyInterestRate * Math.pow(1 + monthlyInterestRate, loanTerm)) / (Math.pow(1 + monthlyInterestRate, loanTerm) – 1); const totalPayment = monthlyPayment * loanTerm; const totalInterest = totalPayment – loanAmount; document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); document.getElementById("totalPayment").value = formatCurrency(totalPayment); document.getElementById("totalInterest").value = formatCurrency(totalInterest); carPaymentSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Interest Rate: ${(interestRate * 100).toFixed(2)}%

`; carPaymentSteps += `Formulas:
Monthly Payment = Loan Amount × (Monthly Interest Rate × (1 + Monthly Interest Rate)^Loan Term) / ((1 + Monthly Interest Rate)^Loan Term – 1)
Total Payment = Monthly Payment × Loan Term
Total Interest = Total Payment – Loan Amount

`; carPaymentSteps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
Total Payment: ${formatCurrency(totalPayment)}
Total Interest: ${formatCurrency(totalInterest)}
`; if (document.getElementById(“calculationStepsCarPayment”).style.display === “block”) { document.getElementById(“calculationStepsCarPayment”).innerHTML = carPaymentSteps; } } function resetCarPayment(){ document.querySelectorAll(“#car_payment_calculator input”).forEach(el => el.value = “”); carPaymentSteps = “”; document.getElementById(“calculationStepsCarPayment”).innerHTML = “

Not calculated yet.

“; } function toggleCarPaymentSteps(){ const s = document.getElementById(“calculationStepsCarPayment”); const a = document.getElementById(“toggleArrowCarPayment”); if (s.style.display === “none” || s.style.display === “”) { s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = carPaymentSteps || “

Not calculated yet.

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