How to Calculate a Car Lease Payment (Step by Step)

To calculate a monthly car lease payment, enter the capitalized cost, the residual value, the term in months and the money factor into the ByteTools Lease Calculator — it returns the payment split into its depreciation and finance portions. That split is the key to understanding why one deal costs more than another.

This tutorial walks through each input, shows how the math works, and explains how to read the result so you can compare lease offers with confidence. All of it runs locally in your browser, so your negotiated numbers stay private.

The four inputs you need

Step-by-step

1. Pick your currency and enter the capitalized cost — the price you actually negotiated, not the sticker MSRP.
2. Enter the residual value in the same currency. If you only have a percentage, multiply it by the MSRP first.
3. Enter the term in months, such as 36.
4. Enter the money factor as a small decimal like 0.00125. If the dealer quoted an APR instead, divide it by 2400 — a 3% APR is a 0.00125 money factor.
5. Read the result. The tool shows the monthly payment and breaks it into the depreciation portion and the finance portion.

How the math works

A lease payment has two parts. Depreciation is the value the car loses during your term: capitalized cost minus residual, divided by the number of months. The finance charge is interest on the money tied up: cap cost plus residual, multiplied by the money factor. Adding them gives the base monthly payment.

For example, a 30,000 car with an 18,000 residual over 36 months at a 0.00125 money factor: depreciation is (30,000 − 18,000) ÷ 36 = 333.33; finance is (30,000 + 18,000) × 0.00125 = 60. The base payment is about 393 before tax and fees. Seeing the 333 depreciation and 60 finance separately makes it obvious that negotiating the price down helps far more than shaving the money factor here.

What the estimate leaves out

This is a clear approximation of the base payment. It excludes sales tax, acquisition and disposition fees, any down payment or trade-in, and mileage penalties, so your dealer quote will be higher. Use it to compare offers on an apples-to-apples basis and to sanity-check a payment before you sign. It is for planning, not financial advice.

Try the Lease Calculator — free and 100% in your browser.

FAQ

What if the dealer only gave me an APR, not a money factor?

Divide the APR by 2400 to get the money factor. A 6% APR becomes 0.0025, and a 3% APR becomes 0.00125. Enter that decimal in the money factor field and the payment is calculated the same way.

Do I use MSRP or the negotiated price as capitalized cost?

Use the negotiated price you actually agreed to, since that is what depreciation and the finance charge are based on. Using MSRP will overstate your payment. Any down payment or trade-in that reduces the amount financed lowers the effective cap cost further.

Why does the calculator show depreciation and finance separately?

Because the two respond to different levers. Depreciation falls when you lower the price or the residual gap; the finance charge falls when you secure a lower money factor. Seeing both helps you focus your negotiation where it moves the payment most.

Are my lease figures uploaded anywhere?

No. Every calculation runs in your browser and nothing is sent to a server or stored, so the prices and terms you enter stay completely private.

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