Savings Interest Calculator

.car-lease-container { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; max-width: 800px; margin: 20px auto; padding: 25px; border: 1px solid #e1e4e8; border-radius: 12px; background-color: #ffffff; box-shadow: 0 4px 6px rgba(0,0,0,0.05); color: #333; } .car-lease-container h2 { color: #1a73e8; text-align: center; margin-bottom: 25px; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; } @media (max-width: 600px) { .calc-grid { grid-template-columns: 1fr; } } .input-group { display: flex; flex-direction: column; } .input-group label { font-weight: 600; margin-bottom: 8px; font-size: 14px; } .input-group input { padding: 12px; border: 1px solid #ccc; border-radius: 6px; font-size: 16px; } .calc-btn { grid-column: 1 / -1; background-color: #1a73e8; color: white; padding: 15px; border: none; border-radius: 6px; font-size: 18px; font-weight: bold; cursor: pointer; transition: background 0.3s; } .calc-btn:hover { background-color: #1557b0; } #lease-result { margin-top: 25px; padding: 20px; background-color: #f8f9fa; border-radius: 8px; display: none; } .result-item { display: flex; justify-content: space-between; margin-bottom: 10px; padding-bottom: 5px; border-bottom: 1px dashed #ddd; } .result-total { font-size: 24px; font-weight: bold; color: #2e7d32; text-align: center; margin-top: 15px; } .lease-article { margin-top: 40px; line-height: 1.6; } .lease-article h3 { color: #333; border-left: 4px solid #1a73e8; padding-left: 10px; margin-top: 25px; }

Car Lease Monthly Payment Calculator

Gross Capitalized Cost: $0.00
Residual Value: $0.00
Monthly Depreciation: $0.00
Monthly Rent Charge: $0.00
Estimated Monthly Payment: $0.00

Understanding How Car Lease Payments Are Calculated

Leasing a car is different from buying one because you are only paying for the vehicle's depreciation during the time you drive it, plus interest and taxes. To get the most accurate estimate, you need to understand three core components: the Capitalized Cost, the Residual Value, and the Money Factor.

1. Capitalized Cost (Cap Cost)

This is essentially the "sale price" of the car. Just like buying a car, you can negotiate the MSRP down. Your "Net Cap Cost" is the negotiated price minus any down payment, trade-in credit, or dealer rebates. The lower your Cap Cost, the lower your monthly payment.

2. Residual Value

The residual value is what the leasing company estimates the car will be worth at the end of your lease term. It is usually expressed as a percentage of the original MSRP. For example, if a $40,000 car has a 60% residual value after 36 months, its residual value is $24,000. You are only responsible for paying the $16,000 difference (the depreciation).

3. Money Factor

The money factor is the lease version of an interest rate. It is written as a small decimal (e.g., 0.00125). To convert the money factor to a standard APR interest rate, multiply it by 2400. A money factor of 0.00125 is equivalent to a 3% APR.

Lease Calculation Example

Imagine you lease a car with the following terms:

  • MSRP: $30,000
  • Down Payment: $2,000
  • Term: 36 Months
  • Residual: 50% ($15,000)
  • Money Factor: 0.0015

Your monthly depreciation would be ($28,000 – $15,000) / 36 = $361.11. Your monthly rent charge would be ($28,000 + $15,000) * 0.0015 = $64.50. Adding these together (plus tax) gives you your final monthly payment.

function calculateLease() { var msrp = parseFloat(document.getElementById("msrp").value); var downPayment = parseFloat(document.getElementById("downPayment").value) || 0; var tradeIn = parseFloat(document.getElementById("tradeIn").value) || 0; var term = parseFloat(document.getElementById("leaseTerm").value); var mf = parseFloat(document.getElementById("moneyFactor").value); var residualPct = parseFloat(document.getElementById("residualPercent").value); var taxRate = parseFloat(document.getElementById("salesTax").value) || 0; if (isNaN(msrp) || isNaN(term) || isNaN(mf) || isNaN(residualPct) || term <= 0) { alert("Please enter valid numbers for all required fields."); return; } // 1. Calculate Net Capitalized Cost var capCost = msrp – downPayment – tradeIn; // 2. Calculate Residual Value var residualVal = msrp * (residualPct / 100); // 3. Monthly Depreciation Fee // (Net Cap Cost – Residual Value) / Term var depreciationFee = (capCost – residualVal) / term; if (depreciationFee < 0) depreciationFee = 0; // 4. Monthly Rent Charge (Finance Fee) // (Net Cap Cost + Residual Value) * Money Factor var rentCharge = (capCost + residualVal) * mf; // 5. Total Base Monthly Payment var basePayment = depreciationFee + rentCharge; // 6. Monthly Payment with Tax var taxAmount = basePayment * (taxRate / 100); var totalMonthly = basePayment + taxAmount; // Update Display document.getElementById("res-cap-cost").innerText = "$" + capCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("res-residual-val").innerText = "$" + residualVal.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("res-depreciation").innerText = "$" + depreciationFee.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("res-rent").innerText = "$" + rentCharge.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("res-total").innerText = "$" + totalMonthly.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("lease-result").style.display = "block"; }

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