How it works
The calculator starts with the Capitalized cost (cap cost), which is essentially the “selling price” of the vehicle for lease purposes, including any capitalized taxes or add‑ons that are rolled into the lease instead of paid upfront.
The Residual value is the expected value of the car at the end of the lease term, set by the leasing company (usually as a percentage of MSRP). You typically cannot negotiate the residual directly.
Depreciation is the portion of the vehicle’s value you are using up during the lease. The calculator computes a monthly Depreciation charge as Depreciation ≈ (Cap cost − Residual value) ÷ Term months. This spreads the total depreciation evenly over the lease term.
The Money factor is the lease finance rate, analogous to an interest rate but expressed differently. You can approximate APR as Money factor × 2400. The calculator uses the standard lease approximation for the monthly Finance charge: Finance ≈ (Cap cost + Residual value) × Money factor. This treats the average of the starting and ending balances as the financed amount.
The Base monthly payment is then the sum of monthly depreciation and the monthly finance charge: Base monthly payment ≈ Depreciation charge + Finance charge.
Due at signing typically includes a combination of down payment (cap cost reduction), taxes, first month’s payment, and registration or dealer fees. For simplicity, this calculator treats Due at signing as a lump amount you enter directly, separate from recurring payments.
Lease fees (acquisition, disposition, documentation, and similar charges) are entered as a separate lump sum. These fees are added to your total cost for a more complete picture.
Total lease cost over the term is then estimated as Total lease cost ≈ Base monthly payment × Term months + Due at signing + Lease fees. This includes what you pay at signing, all monthly payments, and specified fees, but not mileage penalties or excess wear and tear.