Car Lease Calculator

Car Lease Calculator

Two numbers drive a lease: what the car loses, and what the money costs.

× 2400 ≈ APR. A 0.00275 factor is about 6.6% APR.

Estimate only. Drive-off costs — acquisition fee, doc fee, registration and the first payment — are excluded and vary by lender and state.

A lease payment is two payments stapled together

Every lease monthly payment is the sum of a depreciation charge and a finance charge, plus tax. The depreciation charge is the part of the car's value you actually use up: capitalized cost minus residual value, spread over the term. The finance charge — dealers call it the rent charge — is interest on the money the bank has tied up, and it is calculated on the capitalized cost plus the residual, because the bank is financing the whole car the entire time, not just the part you consume.

That second formula surprises people. It is why a lease with a huge residual still carries real interest, and why a low money factor matters even on a short term. Understanding it is the difference between negotiating a lease and being sold one.

Worked example: the default numbers in the calculator

Take a car with a $35,000 MSRP that you negotiate to $33,000, a 58% residual, a 0.00275 money factor, 36 months, $2,000 down and 7% tax on the payment.

The APR equivalent is 0.00275 × 2400 = 6.60%. Notice the split: 68% of the payment is depreciation, 32% is interest. On a car with a weak residual that ratio skews further toward depreciation, and no amount of rate shopping will fix it.

What a down payment really buys you

Run the same deal with $0 down and the payment rises to $534.31, with a total outlay of 9,235. So paying $2,000 up front saved $352 over three years — the rent charge on $2,000 for 36 months, plus the tax on it. That is a real saving, but it is small, and it comes with a catch: if the car is stolen or totaled in month four, the insurer pays the leasing bank the car's value and your $2,000 is gone. Gap coverage protects the bank, not your cap cost reduction. Most experienced lessees put as little down as the deal allows.

Shop the money factor, not the payment

Money factors are quoted to five decimals and dealers can mark them up, typically by 0.0004 (about 1% APR) as backend profit. In our example, cutting the factor from 0.00275 to 0.00125 drops the finance charge from 41.07 to $64.13 — roughly $2,960 less over the lease, and the payment falls to $386.64. Ask for the buy rate, the residual percentage and the capitalized cost in writing before you talk about monthly payments. If a salesperson answers "what payment do you want?", they are telling you they intend to reach that number by moving the term or the down payment rather than the price.

Lease versus buy: where the lines cross

Leasing is cheapest per month, always, because you only fund the depreciation. Buying is cheapest per mile if you keep the car past the loan. The crossover for most mainstream cars is around year six or seven of ownership: by then a purchased car is paid off and its remaining value is yours, while a serial lessee has made 84 straight payments and owns nothing. Leasing wins when you genuinely want a new car every three years, when you drive predictable low mileage, when the residual is unusually strong, or when a business deduction changes the math. It loses badly if you break the contract early — early termination often costs the remaining payments minus a discounted resale value.

Mileage, wear and the fees this calculator ignores

Leases quote 10,000, 12,000 or 15,000 miles per year. Exceeding the cap costs $0.15 to $0.25 per mile, so 6,000 extra miles on a 36-month lease is $900 to ,500 at turn-in. Buying extra miles up front is usually cheaper than paying the penalty later, but unused prepaid miles are not refunded. Excess wear — kerbed alloys, a cracked windscreen, tyres below the tread minimum — is billed at lease end too.

Two limitations to keep in mind. First, this tool leaves out drive-off costs: an acquisition fee of roughly $595 to ,095, documentation and registration fees, and the first month's payment due at signing. Second, it applies tax to each monthly payment, which is how most US states and the UK treat lease rentals — but a handful tax the full selling price up front, and some tax the capitalized cost reduction as well. Use the payment here as your negotiating benchmark, then reconcile the dealer's worksheet line by line against it.

Sources & further reading

Frequently asked questions

How do I turn a money factor into an APR?

Multiply the money factor by 2400. A money factor of 0.00275 is roughly a 6.6% APR, and 0.00125 is about 3%. The 2400 comes from 2 x 1200 — the doubling accounts for the fact that lease interest is charged on the average of what you owe now and the residual you will still owe at the end.

Who sets the residual value, and can I change it?

The leasing bank sets it, usually from an ALG or Black Book forecast of what the car will be worth at lease end. You cannot negotiate it. A high residual is good for you: less of the car's value is consumed during the lease, so your depreciation charge drops.

Should I negotiate the monthly payment or the price?

Always negotiate the selling price, then check the payment. A dealer can hit any monthly target by stretching the term or rolling in a down payment, and neither saves you money. Agree the capitalized cost first, ask for the money factor and residual in writing, then run the numbers yourself.

Why is my quoted payment higher than this result?

This tool prices the lease itself. Quotes usually add an acquisition fee of $595 to $1,095, a documentation fee, registration and sometimes a security deposit. Some states also tax the full selling price rather than each payment, which changes the tax line substantially.