What Is a Car Lease Calculator?
A car lease calculator estimates the monthly payment you'll make when leasing a vehicle instead of buying it. Leasing essentially means paying for the vehicle's depreciation over the lease term plus a finance charge (called the "rent charge"). This tool breaks your payment into those two components and shows the total cost over the lease.
How to Use It
Enter the capitalized cost (the negotiated price of the car plus any added fees), the residual value (the car's predicted worth at lease end, often a percentage of MSRP), the lease term in months, and the money factor from your dealer. Add an optional down payment (cap cost reduction) and sales tax rate to refine the estimate. The calculator instantly shows the depreciation portion, finance charge, base payment, tax, and total lease cost.
The Formula Explained
The standard lease payment formula is: \(\text{Monthly} = (\text{Cap Cost} - \text{Residual}) \div \text{Term} + (\text{Cap Cost} + \text{Residual}) \times \text{Money Factor}\).
$$M = (D + F)\left(1 + \frac{\text{Tax \%}}{100}\right) \\[1.5em] \text{where}\quad \left\{ \begin{aligned} A &= \text{Cap Cost} - \text{Down} \\ D &= \dfrac{A - \text{Residual}}{\text{Term}} \\ F &= (A + \text{Residual})\cdot\text{Money Factor} \end{aligned} \right.$$The first term spreads the vehicle's depreciation evenly across each month. The second term is the finance charge — the money factor (e.g. \(0.0025\)) multiplied by the sum of cap cost and residual. To convert a money factor to an approximate APR, multiply it by 2400 (\(0.0025 \times 2400 = 6\%\) APR).
Worked Example
Suppose a car has a $30,000 cap cost, an $18,000 residual, a 36-month term, and a 0.0025 money factor, with no down payment and no tax. Depreciation = \((30{,}000 - 18{,}000) \div 36 = \$333.33/\text{mo}\). Finance charge = \((30{,}000 + 18{,}000) \times 0.0025 = \$120/\text{mo}\). Monthly payment = \(333.33 + 120 =\) $453.33.
FAQ
What is a money factor? It's the lease equivalent of an interest rate, shown as a small decimal. Multiply by 2400 to get the approximate APR.
Does a down payment lower my payment? Yes — a cap cost reduction lowers the financed amount, reducing both depreciation and finance portions.
Is sales tax included? In most US states, tax is applied to the monthly payment. Enter your local rate to include it; leave it at 0 to see the pre-tax payment.
