A lease is a loan on the part of the car you use up. Instead of paying off the whole price, you pay for the drop in value over the lease term plus a finance charge on the money the leasing company has tied up in the vehicle. This calculator follows the same arithmetic that leasing companies use, so you can check a dealer’s quote line by line before you sign.
How to use the car lease calculator
- Enter the MSRP from the window sticker and the negotiated price you agreed on.
- Add any fees rolled into the lease (acquisition and documentation fees are common), then your cash down and any trade-in equity or rebates.
- Choose the lease term and enter the residual value as a percentage of MSRP.
- Enter the rate as a money factor (for example 0.00250) or switch to APR if that is what you were quoted.
- Add your sales tax rate and pick how your state taxes leases.
- Optionally enter your mileage allowance, the miles you expect to drive and the per-mile overage charge to see a likely end-of-lease bill.
The lease payment formula
Here n is the number of months. The rent charge uses the sum of the cap cost and the residual because it is a shortcut for interest on the average balance over the lease: the balance starts near the cap cost and ends at the residual. Multiplying that sum by the money factor gives the same result as charging APR ÷ 12 on the average of the two — which is exactly why APR ≈ money factor × 2,400.
Worked example
A car stickers at $40,000 and you negotiate it to $38,000. The acquisition fee is $995, you put $2,000 down, and the 36-month lease has a 58% residual and a money factor of 0.0025 (about 6% APR). Sales tax is 7% on each payment.
Adjusted cap cost = 38,000 + 995 − 2,000 = $36,995
Residual = 40,000 × 58% = $23,200
Depreciation fee = (36,995 − 23,200) ÷ 36 = $383.19
Rent charge = (36,995 + 23,200) × 0.0025 = $150.49
Payment = (383.19 + 150.49) × 1.07 = $571.04 a month
Over 36 months you pay $20,557.43 in payments plus the $2,000 down, for a total of $22,557.43 — roughly $627 a month for the use of the car.
What moves the payment most
| Change (same example) | New payment | Why |
|---|---|---|
| Negotiate $1,000 more off the price | about $539 | Lower cap cost cuts both depreciation and rent |
| Residual rises from 58% to 62% | about $528 | Less value to pay for |
| Money factor drops to 0.0015 | about $507 | Rent charge falls by about $60 a month |
| Term stretches to 48 months (same residual) | about $469 | Only valid if the residual for 48 months is really that high |
The last row is a trap: a longer lease almost always comes with a lower residual, so the real saving is smaller than it looks. Always plug in the residual the leasing company publishes for the term you choose.
How states tax leases
Most states charge sales tax on each monthly payment, which is the default here. A few collect tax on the total of all payments at signing, and some tax the full vehicle price as if you had bought it. Down payments and rebates may also be taxable as part of the cap cost reduction. Choose the option that matches your state, and check the dealer’s worksheet for the exact treatment.
Before you sign
- Ask for the buy rate money factor. Dealers can mark it up, and a few ten-thousandths add up to hundreds of dollars.
- Compare the deal with buying: the lease vs. buy calculator puts both on the same footing, and the car loan calculator prices the financing side.
- Budget for the end: disposition fees, excess wear and mileage charges come due when you return the car.
These figures are estimates for planning, not financial advice. The lease agreement and the leasing company's disclosures are the authoritative numbers for any specific contract.
Frequently asked questions
How is a car lease payment calculated?
A lease payment has two parts. The depreciation fee is the adjusted capitalized cost minus the residual value, divided by the number of months. The rent charge is the adjusted capitalized cost plus the residual, multiplied by the money factor. Most states then add sales tax to each payment.
How do I convert a money factor to an APR?
Multiply the money factor by 2,400. A money factor of 0.0025 is about 6% APR, and 0.00175 is about 4.2%. To go the other way, divide the APR by 2,400.
Does a bigger down payment lower the total cost of a lease?
It lowers the monthly payment and trims the rent charge slightly, but most of the cash simply prepays depreciation. If the car is totaled or stolen early in the lease, gap coverage pays the leasing company, not you, so large cap cost reductions carry real risk.
What is a good residual value?
Higher is better for the lessee, because you pay only for the value the car loses. Residuals are set by the leasing company for each model, term and mileage allowance; a 36-month lease often lands somewhere between the mid-40s and low-60s as a percentage of MSRP.
Why is the residual based on MSRP rather than my negotiated price?
Leasing companies publish residual percentages against the sticker price so the same table works for every dealer. That is why negotiating the selling price down is so effective: it reduces the capitalized cost while the residual stays the same.