A car lease calculator estimates a monthly payment from a vehicle price, the lease-end residual value, a money factor, and the lease term. It separates the estimated payment into depreciation, a finance charge, and any sales tax rate you enter.
Use the result to understand the arithmetic in a quote, not as a lease offer or a promise of what a dealer or leasing company will charge. Contract terms, taxes, and fees vary.
Note on the displayed total: the total lease cost shown in the tool currently counts the acquisition fee twice — it is added to the capitalized cost and again to the upfront amount. Use the monthly payment, not the total, for comparisons until that calculation is reviewed.
How a lease payment is estimated
The calculator models three monthly components:
- Depreciation: The difference between the modeled capitalized cost and residual value, divided across the term.
- Finance charge: The sum of capitalized cost and residual value multiplied by the money factor.
- Sales tax: The pre-tax monthly payment multiplied by the tax percentage entered in the calculator.
The model's formulas are:
Capitalized cost = vehicle price - down payment + acquisition fee
Residual value = vehicle price x residual percentage
Monthly depreciation = (capitalized cost - residual value) / lease term
Monthly finance charge = (capitalized cost + residual value) x money factor
Monthly payment = (monthly depreciation + monthly finance charge) x (1 + entered tax rate)
Inputs and assumptions
- Vehicle price: The calculator uses the entered amount as the basis for the residual value. It does not have a separate field for MSRP, negotiated selling price, or additional capitalized costs.
- Residual percentage: Enter a percentage from 1% to 99%. The tool multiplies it by the entered vehicle price; it does not forecast the car's resale value.
- Money factor: Enter the decimal from a quote, between 0.00001 and 0.01. Do not enter an APR in this field.
- Term: Select 24, 36, or 48 months.
- Down payment: The entered amount reduces the capitalized cost used in the monthly calculation.
- Acquisition fee: The tool adds this fee to the capitalized cost. It accepts amounts from $0 to $5,000.
- Sales tax rate: The entered percentage is applied to the modeled monthly depreciation and finance charge. Leaving it blank is treated as 0%.
Tax rules differ by location and contract. This calculator applies the tax rate to each monthly pre-tax payment; it does not determine whether that is how tax is assessed for a particular lease.
Where a real quote diverges from this model
The tool applies one vehicle price to both sides of the calculation. A real contract often sets the residual as a percentage of the manufacturer's MSRP while the capitalized cost reflects a negotiated selling price, so no single input reproduces both numbers. Enter the MSRP if you want the residual to match the contract, and remember that the payment then assumes you paid sticker. Enter the negotiated price if you want the cap cost to match, and accept that the residual will be understated.
The money factor is also a quoted number rather than a market rate: a leasing company sets a base rate, and a dealer may present a higher one. The money-factor section below shows what that spread costs on the worked examples.
Money factor and equivalent rate
A money factor is a decimal used in the lease finance-charge formula. The calculator converts it to an equivalent annual rate by multiplying by 2,400:
Equivalent annual rate (%) = money factor x 2,400
For example, a money factor of 0.00125 corresponds to 3.00% using this conversion, while 0.00250 corresponds to 6.00%. This is a comparison aid, not a substitute for the financing terms and disclosures in a signed lease.
In practice, the money factor is rarely printed as such. On most lease worksheets it appears as "MF" or is folded into a "lease charge" line, and you can reverse it: divide the monthly lease charge by the sum of the capitalized cost and the residual value. In Example A below, $66.18 ÷ ($33,695 + $19,250) ≈ 0.00125. If the quotient implies an annual rate well above the buy rate your bank or credit union would charge, the markup is in the factor.
The size of that markup is worth negotiating. Holding the Example B inputs fixed, a quoted money factor of 0.00250 produces a $777.29 monthly payment; at a buy rate of 0.00200 — an illustrative gap, not a market claim — the payment falls to $738.95. That is $38.34 a month and $1,380.14 over the 36-month term for asking one question: what is the buy rate? Asking for the base rate and comparing it with the quote is a normal part of negotiation, and the quote should be checked against your own financing pre-approval before signing.
Worked examples
These examples use the calculator's stated assumptions. Actual quotes may use different prices, residuals, fees, tax treatment, or rounding.
| Input or result | Example A | Example B |
|---|---|---|
| Vehicle price | $35,000 | $45,000 |
| Residual percentage / value | 55% / $19,250 | 58% / $26,100 |
| Money factor / equivalent annual rate | 0.00125 / 3.00% | 0.00250 / 6.00% |
| Term and down payment | 36 months / $2,000 | 36 months / $0 |
| Acquisition fee / entered tax | $695 / 7% | $895 / 6.5% |
| Capitalized cost | $33,695 | $45,895 |
| Monthly depreciation | $401.25 | $549.86 |
| Monthly finance charge | $66.18 | $179.99 |
| Monthly tax | $32.72 | $47.44 |
| Estimated monthly payment | $500.15 | $777.29 |
Limits of this estimate
The calculator does not determine the residual offered by a leasing company, whether a down payment is appropriate, or the tax treatment for a particular state or locality. It does not include registration, documentation, disposition, excess-mileage, wear-and-tear, insurance, maintenance, or other fees unless represented by the fields described above. A vehicle's condition, mileage, and end-of-term options can also affect what you owe.
The displayed lease-cost and buy comparison are simplified estimates, not a full lease-versus-own analysis: they do not value the vehicle you would own after buying or account for all ongoing ownership costs and contract charges — and, as noted in the intro above, the displayed total lease cost currently counts the acquisition fee twice. Check a written quote for the exact amount due at signing, whether fees are paid or capitalized, and the end-of-lease obligations. A down payment reduces this calculator's modeled capitalized cost, but the calculator cannot determine how a down payment would be treated after a theft or total loss; review the lease and insurance terms.
Mileage overage: what it costs when the calculator does not model it
The calculator has no mileage fields, but the contract charge is easy to size by hand: multiply the excess miles by the per-mile charge in your lease. A 36-month lease with a 12,000-mile annual allowance permits 36,000 miles; driving 15,000 a year puts you at 45,000, or 9,000 miles over. At $0.25 a mile that is $2,250 due at turn-in, equivalent to $62.50 a month across the term. To compare a mileage overage against buying instead, enter the same figures in the Car Lease vs Buy Calculator, which does estimate it.
For a consumer overview of lease terms, charges, and end-of-lease choices, see the Federal Trade Commission's guide to leasing a car. Your signed agreement controls the specific terms.
For a broader comparison, use the Car Lease vs Buy Calculator, estimate the cost to purchase a leased vehicle with the Car Lease Buyout Calculator, or compare a lease estimate with an auto-loan payment using the Auto Loan Calculator.
Last verified: October 2026. Calculator figures are outputs for the inputs entered; they are not live quotes, current rates, or an offer.