Car Lease Calculator with Money Factor to APR

How a lease payment is calculated

A lease payment has two parts. Depreciation = (adjusted cap cost − residual value) ÷ months. That is the slice of the car's value you use up. Rent charge = (adjusted cap cost + residual value) × money factor. That is the financing cost. Add them, then add sales tax the way your state charges it.

Adjusted cap cost is the negotiated price plus fees rolled into the lease (acquisition fee, sometimes doc fees) minus your down payment and trade-in equity. Residual value is the leasing company's guess at the car's value at lease end, set as a percentage of MSRP, not of the price you negotiated. That detail matters: negotiating the price down lowers your payment, but the residual stays the same.

Money factor to APR, and back

Dealers quote lease financing as a money factor, a small decimal like 0.00250, because it looks tiny. Multiply by 2,400 to get the approximate APR: 0.00250 × 2,400 = 6.0 percent. To go the other way, divide the APR by 2,400. Type into either box above and the other updates.

Always ask for the money factor in writing, and check it against the captive lender's buy rate for your credit tier (forums for each brand post these monthly). Dealers are allowed to mark it up, often by 0.0004, which is almost 1 point of APR.

Worked example: $40,000 MSRP, 36 months

Negotiated price $37,500, $995 acquisition fee rolled in, $2,000 down. Adjusted cap cost = $37,500 + $995 − $2,000 = $36,495. Residual at 58 percent of MSRP = $23,200.

Depreciation = ($36,495 − $23,200) ÷ 36 = $369.31. Rent charge = ($36,495 + $23,200) × 0.0025 = $149.24. Base payment $518.54. With 7 percent tax on each payment ($36.30), you pay $554.84 a month.

Due at signing: $2,000 down + $500 of registration and dealer fees + the first payment = $3,054.84. Total cost over 36 months: $22,474.28. That is an effective $624.29 a month, about $70 more than the advertised payment, because the down payment is spread across the lease.

In a state that taxes the total of all payments at signing, the tax would be $1,306.73 due up front instead. In a state that taxes the full price, it would be $2,625. Same car, same deal, up to $1,300 difference in tax, which is why the calculator asks how your state handles it.

How to get a cheaper lease

Negotiate the price, not the payment. Every $1,000 off the cap cost saves about $32 a month on a 36-month lease at this money factor: $27.78 of depreciation plus $2.50 of rent charge, plus 7 percent tax.

Pick cars with high residuals. A car that keeps 60 percent of its value costs much less to lease than one that keeps 50 percent, even at the same price.

Put as little down as possible. If the car is totaled or stolen in month two, gap insurance pays the lender, but your down payment is usually gone. Paying the same money as monthly payments costs almost nothing extra and removes that risk.

Use multiple security deposits if the brand offers them. Each refundable deposit lowers the money factor, often by 0.00007 per deposit, a risk-free return.

Common mistakes

Comparing leases by monthly payment only. A $399 lease with $4,000 down costs more than a $499 lease with $0 down on 36 months. Compare the effective cost per month instead.

Ignoring mileage. Standard leases allow 10,000 to 12,000 miles a year. Overage charges run 15 to 30 cents a mile, so 3,000 extra miles a year on a 3-year lease can cost $1,350 to $2,700 at turn-in.

Using the residual as a percentage of the selling price. It is always a percentage of MSRP.

Rolling negative equity from a trade-in into the lease. It raises the cap cost, and you pay rent charge on it.