How to Calculate Flat Interest Rate

Car Lease Payment Calculator

24 Months 36 Months 48 Months 60 Months
Or APR ÷ 2400

Estimated Monthly Payment

Gross Capitalized Cost:

Residual Value:

Monthly Depreciation:

Monthly Rent Charge:

Monthly Tax:

Understanding Your Car Lease Calculation

Leasing a vehicle is often more complex than a standard car loan because you are essentially paying for the vehicle's depreciation during the time you drive it, rather than the full purchase price. To get the most out of this calculator, it's important to understand the key variables involved.

Key Leasing Terms Explained

  • Gross Capitalized Cost: This is the negotiated price of the vehicle. Just like buying a car, you should always negotiate the "Cap Cost" rather than just looking at the monthly payment.
  • Residual Value: This is the estimated value of the car at the end of the lease term. It is set by the leasing company. A higher residual value results in a lower monthly payment because you are paying for less depreciation.
  • Money Factor: This is the interest rate of the lease. To convert a Money Factor to a standard APR, multiply it by 2400. For example, a money factor of 0.00125 is equivalent to a 3% APR.
  • Capitalized Cost Reduction: This includes your down payment, trade-in value, and any manufacturer rebates. These amounts reduce the initial balance used to calculate depreciation.

The Lease Formula

The monthly lease payment is actually the sum of three distinct parts:

  1. Depreciation Fee: (Net Cap Cost – Residual Value) ÷ Term in Months
  2. Finance Fee (Rent Charge): (Net Cap Cost + Residual Value) × Money Factor
  3. Sales Tax: (Depreciation + Finance Fee) × Local Tax Rate

Example Calculation

If you lease a car worth $35,000 with a $3,000 down payment, a 55% residual value ($19,250), and a money factor of 0.00125 over 36 months:

  • Monthly Depreciation: ($32,000 – $19,250) / 36 = $354.17
  • Monthly Rent Charge: ($32,000 + $19,250) * 0.00125 = $64.06
  • Subtotal: $418.23
  • With 7.5% Tax: $449.59 per month
function calculateLease() { var carPrice = parseFloat(document.getElementById("carPrice").value); var downPayment = parseFloat(document.getElementById("downPayment").value); var tradeIn = parseFloat(document.getElementById("tradeIn").value); var leaseTerm = parseFloat(document.getElementById("leaseTerm").value); var moneyFactor = parseFloat(document.getElementById("moneyFactor").value); var residualPercent = parseFloat(document.getElementById("residualValue").value); var taxRate = parseFloat(document.getElementById("taxRate").value); if (isNaN(carPrice) || isNaN(downPayment) || isNaN(moneyFactor) || isNaN(residualPercent)) { alert("Please enter valid numerical values."); return; } // 1. Calculate Adjusted Capitalized Cost var adjCapCost = carPrice – downPayment – tradeIn; // 2. Calculate Residual Value var residualValue = carPrice * (residualPercent / 100); // 3. Monthly Depreciation var monthlyDepreciation = (adjCapCost – residualValue) / leaseTerm; // 4. Monthly Rent Charge (Finance Fee) // Formula: (Adj Cap Cost + Residual) * Money Factor var monthlyRentCharge = (adjCapCost + residualValue) * moneyFactor; // 5. Monthly Subtotal var subtotal = monthlyDepreciation + monthlyRentCharge; // 6. Tax var monthlyTax = subtotal * (taxRate / 100); // 7. Total Payment var totalPayment = subtotal + monthlyTax; // Display Results document.getElementById("leaseResult").style.display = "block"; document.getElementById("monthlyPaymentOutput").innerText = "$" + totalPayment.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("outCapCost").innerText = "$" + adjCapCost.toLocaleString(); document.getElementById("outResidualValue").innerText = "$" + residualValue.toLocaleString(); document.getElementById("outDepreciation").innerText = "$" + monthlyDepreciation.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("outRentCharge").innerText = "$" + monthlyRentCharge.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("outTax").innerText = "$" + monthlyTax.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); // Scroll to result document.getElementById("leaseResult").scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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