Leasing and buying are two completely different ways to use a vehicle, yet the monthly price tag is the only number most shoppers compare. The problem is that a lease payment looks smaller partly because you are paying only for the vehicle's depreciation during the contract, not for ownership. A lease-vs-buy calculator flips that around: it totals what you actually spend over the period you plan to keep the vehicle, subtracts the equity you would own if you bought, and tells you which option leaves you financially ahead.
This calculator uses a simple net-cost model. Enter the lease payment, the money due at signing, the loan payment you would face if you financed the purchase, the down payment for buying, how many months you plan to keep the vehicle, and the expected resale equity at that point. The result card breaks out the total lease cost, the total money you would pay out buying, the net cost of buying after your equity, and the dollar gap that decides which option wins.
How to Use
- Enter the Monthly Lease Payment — the quoted lease bill, including tax on the vehicle's value. This is the headline number dealers love to advertise.
- Set Due at Lease Signing to the cash you would hand over when signing: first month, drive-off fees, and any cap-cost reduction. If you negotiated a zero-down lease, leave it at $0.
- Enter the Monthly Loan Payment you would pay if you financed the same vehicle with an auto loan. Use your actual rate and term from a lender or pre-approval.
- Set the Down Payment When Buying — cash down plus trade-in equity and rebates applied at purchase.
- Choose the Comparison Period in months. For a fair comparison, match it to the lease term you are weighing (commonly 36 months). Comparing a 36-month lease to a 60-month loan hides the fact that you would still be making payments after the lease ended.
- Enter the Estimated Equity at End — the expected resale value of the vehicle minus any remaining loan balance at the end of the comparison period. When you buy, you keep this asset; when you lease, you hand the keys back and keep nothing.
The result card computes the total cost of each path over the same horizon, then subtracts your expected equity from the purchase side. The option with the lower net cost is the cheaper choice, and the gap between them is your estimated savings.
The Net-Cost Formula
Most shoppers stop at the monthly payment, but that compares two different products. The correct way to decide is to total each path over the same number of months:
- Total lease cost = due at signing + (monthly lease payment × months)
- Total buy outlay = down payment + (monthly loan payment × months)
- Net buy cost = total buy outlay − estimated equity at the end
Here is the key idea: when the lease ends, you own nothing. When you buy, even with a loan, you walk away with an asset worth whatever the vehicle is worth at that moment, minus what you still owe. Subtracting that equity from your purchase spending shows what buying actually cost you to drive the vehicle for the period.
Worked example: a $491/month lease with $0 due at signing over 36 months costs 491 × 36 = $17,676. Buying the same vehicle means a $550/month loan plus a $3,000 down payment: 550 × 36 + 3,000 = $22,800 out of pocket. If the vehicle is worth $8,000 in equity after those 36 months, your net buy cost is 22,800 − 8,000 = $14,800. Comparing $17,676 (lease) against $14,800 (net buy), buying is the cheaper path by about $2,876 over three years. The lease payment looked lower every month, but the equity you built by owning flipped the result.
Why the Monthly Payment Lies
A lower lease payment is not the same as a lower cost. Lease payments are low because they cover only depreciation and a rent charge during a fixed term. At the end, you have no asset and you must either buy the car at its pre-set residual or start over with a new vehicle. Buyers, by contrast, keep paying even after the loan is gone — and those later payment-free years can make buying dramatically cheaper over a long hold.
Leasing wins when you want a newer vehicle every two or three years, drive fewer than the allowed miles, and stay within wear limits, because you are effectively renting the depreciation. Buying wins when you keep the vehicle well beyond the loan term, drive a lot of miles (leases charge steep per-mile penalties), or prefer to build equity you can sell or trade.
Examples
Example 1 — The classic flip. A shopper is quoted a $491/month lease over 36 months with $0 due at signing. The same car financed costs $550/month with a $3,000 down payment, and the car should be worth $8,000 in equity after three years. The lease totals $17,676, the purchase totals $22,800 out of pocket, but net of $8,000 equity the purchase costs only $14,800. Buying is ahead by about $2,876.
Example 2 — When leasing genuinely wins. A driver prefers to switch vehicles every three years and expects heavy wear and above-average mileage. The lease runs $300/month plus a $2,000 drive-off over 36 months ($12,800), while buying would require a $600/month loan and $5,000 down ($26,600 out of pocket, or $21,600 net of $5,000 equity). With no desire to keep the car past the term, leasing is the lower-cost choice by about $8,800.
Example 3 — A luxury car that holds value. A high-end vehicle at $1,200/month to lease ($5,000 drive-off) versus $1,800/month to buy with $40,000 down. After 36 months the car still has $1,000,000 of expected resale equity relative to the loan. The lease costs $48,200 with nothing to show, while buying produces a large positive equity position — buying wins by a wide margin because the asset retained so much value.
Example 4 — A shorter 24-month hold. A $389/month lease with $1,500 due at signing over 24 months costs $10,836. Financing at $480/month with $8,000 down costs $19,520, but the car holds $12,000 of equity, for a net buy cost of $7,520. Even over just two years, buying comes out ahead by about $3,316.
FAQ
Is it always cheaper to lease because the monthly payment is lower?
No. A lower monthly lease payment reflects the fact that you are paying only for depreciation during a fixed term, and you walk away with no asset at the end. When you subtract your expected resale equity from the purchase side, buying often becomes the cheaper option over the same period — even if the loan payment is larger every month.
How do I estimate the equity at the end of the comparison period?
Start with the vehicle's projected resale value at that mileage and age (use pricing guides for your make, model, and year), then subtract the remaining loan balance. For a lease, that equity figure does not apply to you because you return the car; the "Due at Signing" and monthly payments are your complete cost.
What comparison period should I use?
Match the period to the lease term you are considering, usually 36 months. Comparing a 36-month lease against a 60-month loan is misleading, because you would still owe money long after the lease ended and had to replace the vehicle. For an honest comparison, total both options over the same number of months.
Does a large down payment make buying better?
A large down payment reduces your loan balance and monthly interest, but it also puts more of your cash into a depreciating asset. The calculator includes it on the purchase side. Leases with a large drive-off charge are generally less attractive, because that cash is not protected the way an ownership down payment is when the car is totaled early.
What if I drive more than the lease mileage allowance?
Leases charge 15 to 30 cents per excess mile, which can erase the apparent monthly savings. If you expect high mileage, model the overage into your lease cost, or choose to buy — buyers pay no per-mile penalty and keep the equity regardless of mileage.
Should I lease or buy if I want a new vehicle every few years?
Leasing is often the better financial and practical fit if you enjoy switching vehicles every two to three years, drive under the mileage cap, and keep the car in good condition. It keeps payments predictable and avoids resale hassle. If you prefer to drive one vehicle for many years and build equity, buying usually wins.
Disclaimer
This lease-vs-buy calculator is provided for informational purposes only and does not constitute financial, lending, or tax advice. Estimates are based on the inputs you enter and the net-cost model described above; actual lease terms, loan rates, resale values, tax treatment, and mileage charges vary by lender, dealer, credit profile, location, and vehicle. Always confirm your final numbers directly with a licensed dealer, lender, or financial professional before committing to a lease or a loan.