.lease-calc-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e1e1e1;
border-radius: 12px;
background-color: #ffffff;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.lease-calc-header {
text-align: center;
margin-bottom: 30px;
}
.lease-calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.lease-calc-grid { grid-template-columns: 1fr; }
}
.lease-input-group {
margin-bottom: 15px;
}
.lease-input-group label {
display: block;
font-weight: 600;
margin-bottom: 8px;
color: #333;
}
.lease-input-group input {
width: 100%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
box-sizing: border-box;
font-size: 16px;
}
.lease-calc-btn {
width: 100%;
background-color: #0073aa;
color: white;
padding: 15px;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
margin-top: 10px;
transition: background-color 0.3s;
}
.lease-calc-btn:hover {
background-color: #005177;
}
.lease-result-box {
margin-top: 30px;
padding: 20px;
background-color: #f9f9f9;
border-radius: 8px;
border-left: 5px solid #0073aa;
display: none;
}
.lease-result-item {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
font-size: 17px;
}
.lease-total-payment {
font-size: 24px;
font-weight: bold;
color: #0073aa;
border-top: 1px solid #ddd;
padding-top: 10px;
margin-top: 10px;
}
.lease-article {
margin-top: 40px;
line-height: 1.6;
color: #444;
}
.lease-article h2 { color: #222; margin-top: 25px; }
MSRP (Vehicle Price) ($)
Down Payment ($)
Trade-in Allowance ($)
Lease Term (Months)
Residual Value (%)
Money Factor
Sales Tax (%)
Calculate Monthly Payment
Gross Capitalized Cost:
Residual Value:
Monthly Depreciation:
Monthly Rent Charge:
Total Monthly Payment:
Understanding How Car Leases Are Calculated
Leasing a car is different from traditional financing. When you lease, you are essentially paying for the depreciation of the vehicle over the time you use it, plus interest (known as the money factor) and taxes.
Key Leasing Terms Explained
MSRP: The Manufacturer's Suggested Retail Price. This is the starting point for negotiations.Residual Value: This is the estimated value of the car at the end of the lease term. A higher residual value usually results in a lower monthly payment because you are paying for less depreciation.Money Factor: This is the interest rate on a lease. To convert this to a standard APR, multiply the money factor by 2,400. For example, a money factor of 0.00125 equals a 3% APR.Cap Cost Reductions: This includes your down payment, trade-in value, and any manufacturer rebates that reduce the amount being financed.
The Lease Payment Formula
The math behind a lease payment involves three main components:
Depreciation Fee: (Net Capitalized Cost – Residual Value) / Lease TermFinance Fee (Rent Charge): (Net Capitalized Cost + Residual Value) × Money FactorSales Tax: Usually applied to the sum of the Depreciation and Finance fees.
Example Calculation
If you lease a car for $40,000 with a 60% residual after 36 months and a 0.0015 money factor :
Residual Value: $24,000
Total Depreciation: $16,000 / 36 = $444.44/mo
Rent Charge: ($40,000 + $24,000) * 0.0015 = $96.00/mo
Pre-tax Payment: $540.44/mo
function calculateCarLease() {
// Get Input Values
var msrp = parseFloat(document.getElementById("msrpValue").value);
var down = parseFloat(document.getElementById("downPayment").value) || 0;
var trade = parseFloat(document.getElementById("tradeIn").value) || 0;
var term = parseFloat(document.getElementById("leaseTerm").value);
var residualPercent = parseFloat(document.getElementById("residualValue").value);
var mf = parseFloat(document.getElementById("moneyFactor").value);
var taxRate = parseFloat(document.getElementById("salesTax").value) || 0;
// Validate inputs
if (isNaN(msrp) || isNaN(term) || isNaN(residualPercent) || isNaN(mf) || msrp <= 0 || term <= 0) {
alert("Please enter valid positive numbers for the MSRP, Term, Residual, and Money Factor.");
return;
}
// 1. Calculate Gross Cap Cost (Simplified)
var capCost = msrp – down – trade;
if (capCost < 0) capCost = 0;
// 2. Calculate Residual Value Amount
var residualAmount = msrp * (residualPercent / 100);
// 3. Monthly Depreciation
var monthlyDepreciation = (capCost – residualAmount) / term;
if (monthlyDepreciation < 0) monthlyDepreciation = 0;
// 4. Monthly Rent Charge (Finance Fee)
// Formula: (Net Cap Cost + Residual) * Money Factor
var monthlyRent = (capCost + residualAmount) * mf;
// 5. Pre-tax Subtotal
var preTaxSubtotal = monthlyDepreciation + monthlyRent;
// 6. Tax Calculation
var monthlyTax = preTaxSubtotal * (taxRate / 100);
// 7. Total Payment
var totalMonthly = preTaxSubtotal + monthlyTax;
// Format Currency
function formatCurrency(num) {
return "$" + num.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
}
// Display Results
document.getElementById("resCapCost").innerHTML = formatCurrency(capCost);
document.getElementById("resResidual").innerHTML = formatCurrency(residualAmount);
document.getElementById("resDepreciation").innerHTML = formatCurrency(monthlyDepreciation);
document.getElementById("resRentCharge").innerHTML = formatCurrency(monthlyRent);
document.getElementById("resTotalPayment").innerHTML = formatCurrency(totalMonthly);
// Show result box
document.getElementById("leaseResult").style.display = "block";
}