The sticker price is only the beginning. When you compare a brand-new car with a three- or four-year-old one, the number that actually decides who wins is not the purchase price — it is the total cost of ownership over the years you will keep the car. Depreciation, the silent cost of driving a car off the lot, destroys more value in the first year than fuel, insurance, and maintenance combined. This new vs used car calculator makes that gap visible: it compares the five-year total cost of ownership (TCO) of a new car against a used car, adding up depreciation and insurance for each and showing exactly how much money buying used saves you.
Slide the controls and the result card updates instantly. Use the default numbers first — a $35,000 new sedan versus a $22,000 used example — to see how the math plays out in a typical real-world scenario.
How to Use
- Enter the New Car Price you are actually considering. The default $35,000 represents a common midsize sedan or SUV, but type in whatever window sticker you are negotiating against.
- Set the New Car First-Year Depreciation rate. Industry studies put the one-year hit at roughly 15%–25% the moment you take delivery; 20% is the median assumption. Luxury brands and EVs often sit at the high end of that range.
- Choose the New Car Annual Depreciation for years two and beyond. After the initial drop, most vehicles lose about 8%–12% of their remaining value each year; 10% is the default.
- Enter the Used Car Price — the asking price of the 3–5-year-old alternative on your shortlist. The $22,000 default reflects a well-kept example of the same class.
- Set the Used Car Annual Depreciation. Because an older car has already absorbed its steepest losses, a flat 10% per year is usually a fair assumption.
- Pick the Ownership Period. Five years is the standard comparison window and matches how long most buyers keep a car before trading in.
- Add New Car Insurance and Used Car Insurance. Newer, more valuable cars cost more to fully cover; the defaults of $1,800 and $1,500 per year reflect that gap.
The result card then shows each car's total depreciation, insurance totaled over the period, the full total cost of ownership for both, and the dollar savings you capture by choosing used.
Why Depreciation Decides the Comparison
A brand-new car's worst financial day is delivery day. At 20% first-year depreciation, a $35,000 car is worth only $28,000 the moment you sign the paperwork — $7,000 gone before you have driven a single mile. Over the next four years at 10% per year, its value keeps eroding: by year five it is worth roughly $18,371, meaning the new car has lost about $16,629 in value.
The used car has already survived that cliff. A $22,000, three-year-old car at 10% per year loses only $2,200 in its first year under your ownership, and after five years it is still worth about $12,991 — total depreciation of just $9,009. Add insurance on top: the new car burns $1,800 a year while the used car burns $1,500. Over five years that is $9,000 versus $7,500.
Stack it together and the new car's five-year TCO is $25,629 while the used car's is $16,509. Buying used does not just cost less up front — it saves roughly $9,120 over half a decade, before you even consider that the used car likely carried a smaller loan and paid less interest.
When Buying New Still Makes Sense
Used is not always the obvious answer. New cars come with a full factory warranty, the latest safety technology, zero unknown wear, and often below-market manufacturer financing such as 0% APR. If you plan to keep a car for ten years or more, the steep early depreciation is diluted across a much longer horizon, and the peace of mind of a clean history file can be worth the premium. New cars also avoid the risk of buying someone else's deferred maintenance — a transmission nearing the end of its life, worn suspension, or a neglected timing chain. Run the numbers for your own ownership period before deciding.
Examples
Example 1 — The default five-year case. A $35,000 new car at 20% first-year and 10% ongoing depreciation, insured at $1,800 per year, versus a $22,000 used car at 10% per year, insured at $1,500 per year, held for five years. The new car depreciates $16,629 and insures for $9,000 — a $25,629 TCO. The used car depreciates $9,009 and insures for $7,500 — a $16,509 TCO. Choosing used saves $9,120.
Example 2 — A three-year short hold. If you typically replace your car every three years, the gap narrows but does not disappear. New TCO lands near $17,720 (depreciation $12,320 plus $5,400 insurance) while used TCO is about $10,462 (depreciation $5,962 plus $4,500 insurance). Used still wins by roughly $7,258 — short holds actually hurt new-car buyers more, because you sell while the steepest depreciation is still fresh.
Example 3 — A six-figure luxury comparison. On a $100,000 luxury sedan at 20% first-year and 10% ongoing depreciation, the five-year write-off is about $47,512 in depreciation, plus $9,000 of insurance — a $56,512 TCO. Buying a three-year-old example of the same model for $22,000 instead keeps TCO at $16,509, a savings of about $40,000. This is exactly why "nearly new" luxury cars are such compelling buys: someone else already absorbed the cliff.
FAQ
Is it financially better to buy a new or used car?
For most people holding a car for five years or fewer, buying used is cheaper. In the standard $35,000-new versus $22,000-used comparison, the used car's five-year total cost of ownership is about $16,509 versus $25,629 new — a difference near $9,120. The exception is when a deeply discounted new-car warranty, 0% financing, or an unusually long planned holding period (ten-plus years) offsets the early depreciation hit.
How much value does a new car lose in the first year?
A typical new car loses 15%–25% of its value in the first year; 20% is the median assumption used in this calculator. On a $35,000 car that is a $7,000 loss the moment you drive off the dealer lot. Luxury brands, large SUVs, and electric vehicles often depreciate faster in year one, while popular reliable sedans and trucks lose less.
Why does a used car depreciate so much slower?
Depreciation is front-loaded. The biggest drop happens when a car changes from "new" to "used" in the market's eyes. Once a car is three or four years old, that stigma is gone and its remaining value erodes more gradually — typically around 10% per year. That is why a $22,000 used car loses only about $2,200 in your first year of ownership, versus $7,000 on the equivalent new car.
Does insurance cost more on a new car?
Usually yes. Newer, more valuable cars cost more to insure because the insurer would have to pay more to repair or replace them after a collision. The defaults here assume $1,800 per year for the new car and $1,500 for the used car. If you drop comprehensive and collision coverage on an older paid-off car, the used-car premium can fall even further.
How many years should I keep a car to make buying new worth it?
The longer you hold a car, the more the steep first-year depreciation gets spread out. Many financial planners suggest that if you plan to keep a vehicle for ten years or more, the advantage of buying used shrinks considerably — you get the full warranty window, the latest safety equipment, and predictable maintenance, and the early hit is diluted across a long ownership period.
What else should I include in the true cost of ownership?
This calculator focuses on the two largest controllable levers — depreciation and insurance — so the comparison stays easy to reason about. A complete TCO also adds fuel or charging, maintenance and repairs, registration and sales tax, and financing interest. On a used car, maintenance is typically higher; on a financed new car, interest can be substantial. Test your own loan terms alongside these numbers.
Disclaimer
This new vs used car calculator is provided for informational purposes only and does not constitute financial, insurance, or automotive advice. All figures are estimates based on the depreciation rates, insurance premiums, and ownership period you enter; actual resale values vary by make, model, mileage, condition, region, and market demand. Always confirm insurance quotes, loan terms, and trade-in or private-party values directly with dealers, insurers, and lenders before making a purchase decision.