About the True Cost of Ownership Calculator
A dealer will tell you the monthly payment. Nobody volunteers the other number: what the car costs you over five years once depreciation, fuel, maintenance, insurance and tax are added together. On a typical new car the value quietly lost exceeds everything else combined — and you never see a bill for it, which is precisely why it gets left out.
The fuel line is genuinely measured. It uses the EPA’s rating for the exact engine you pick, not a model average, because a 2019 Accord is 31 mpg as a 1.5 turbo and something else as a 2.0. That is priced at the live EIA retail figure for your state. One honest limitation, surfaced rather than buried: EIA publishes a weekly price for only nine states, so everywhere else gets the agency’s own regional figure and the tool says which you are looking at.
Everything else is labelled for what it is. Depreciation is modelled from a segment-adjusted curve — real in shape, not a valuation of your specific car. Insurance and registration are yours: pre-filled with segment-typical placeholders purely so the sum runs, and worth ten seconds to replace with your renewal notice. Every panel is colour-coded by which of the three it is, because a total assembled from measured and invented numbers should never pretend they carry equal weight.
Add the car currently on screen to the comparison, then pick another and add that too. Everything else — your mileage, state, insurance and hold period — is held constant, so the difference is the car.
The question a spreadsheet answers badly: is the efficient car worth the extra money, and at what mileage does that flip?
Every line for every year, with the provenance label on each, as a spreadsheet you can take to a dealer or a spouse.
How to Use the True Cost of Ownership Calculator
Work down the four vehicle selectors — year, make, model, then engine. That last one is not a formality: the EPA rates fuel economy per configuration, so the 1.5-litre and 2.0-litre versions of the same car are different vehicles as far as running costs are concerned. Enter the price you would actually pay rather than the sticker, set your state and annual mileage, then spend ten seconds replacing the insurance placeholder with your real premium. The headline is the total, but the number to remember is cost per mile, because it is the only figure that makes a hatchback and a pickup genuinely comparable.
The Cost You Never Get a Bill For
Ask most people what their car costs and they will tell you the payment, maybe the fuel. Almost nobody says depreciation, and on a new car it is usually the largest line by a wide margin — often more than fuel, servicing and insurance combined. The reason it stays invisible is structural: every other cost arrives as a transaction you can see, while depreciation is a slow subtraction from an asset you still have. You meet the whole bill on one day, years later, when you find out what somebody will actually pay for it.
The shape is well understood even if the exact figure is not. The steepest fall is in the first year, and the curve flattens afterwards, which is the entire financial argument for buying a two or three-year-old car: somebody else has already absorbed the worst of it. Segment matters enormously too. Body-on-frame trucks and popular SUVs hold value markedly better than large and luxury saloons, which is why the curve here is chosen by the EPA vehicle class rather than applied flat.
Why the Engine Choice Changes the Answer
Fuel is the one running cost this tool can state with real precision, and that precision comes from picking the exact configuration. The EPA tests and publishes economy per powertrain, so within a single model line you can find a spread of five to ten combined mpg between engines. Over 12,000 miles a year for five years, a five-mpg difference on a mid-thirties car is comfortably four figures — roughly the same order as the options package people agonise over at the dealer and considerably more than the accessories.
The other half is what fuel costs where you live, which the tool takes from the US Energy Information Administration weekly retail series. Here is a limitation worth stating plainly, because most calculators quietly paper over it: EIA publishes a weekly price for only nine states — California, Colorado, Florida, Massachusetts, Minnesota, New York, Ohio, Texas and Washington. Everywhere else, this tool uses that state’s EIA regional figure, which is the agency’s own grouping and the closest published number available, and it labels the result so you know which of the two you have. The gap is not trivial either: the West Coast region and the Gulf Coast region routinely differ by well over a dollar a gallon.
Measured, Modelled, or Yours
A total is only as honest as its weakest input, so this calculator sorts every line into three categories and colour-codes them rather than presenting six numbers as if they were equally solid.
- Measured — fuel economy from EPA testing for your exact trim, and the fuel price from EIA. These are published government figures.
- Modelled — depreciation and maintenance. The shape and the segment differences are real and well documented; the exact figure for your specific car on your specific sale date is unknowable in advance, and anyone claiming otherwise is guessing with more confidence.
- Yours — insurance, registration and loan interest. These depend on you far more than on the vehicle, so the tool supplies a placeholder to make the sum run and expects you to replace it.
Where the Real Savings Are
Once the costs are laid out by size, the useful decisions become obvious — and they are rarely the ones buyers spend their energy on.
- Buy slightly used. Letting the first owner take the year-one drop is worth more than almost any negotiation you will ever conduct on a new car.
- Keep it longer. Depreciation per year falls sharply as the car ages while maintenance rises gently, so the total cost per mile usually keeps improving well past the point most people trade in.
- Shop the insurance, not the accessories. A twenty per cent premium difference across a five-year hold typically outweighs every dealer-fitted extra combined.
- Only chase mpg if you drive. At 6,000 miles a year, fuel economy barely moves the total; at 25,000 it dominates. The break-even tool works out exactly where that flips for the two cars you are actually choosing between.
Comparing running costs for a car you already own? The MPG Calculator works out what you are really getting against the sticker, and the Car Depreciation Calculator covers the value curve on its own. Browse every Auto & Vehicle tool for more.
Frequently Asked Questions
What is the biggest cost of owning a car?
Depreciation, and it is not close. On a typical new car the value lost over five years exceeds everything spent on fuel, maintenance and insurance combined. It is invisible because you never write a cheque for it — you only meet it on the day you sell. That is exactly why it belongs at the top of a cost calculation rather than being left out of one.
Why do I have to pick the engine and not just the model?
Because the EPA rates fuel economy per configuration, not per model. A 2019 Honda Accord is rated 31 mpg combined with the 1.5-litre turbo and materially lower with the 2.0-litre, and the same split exists across most model ranges. Averaging them would produce a number that describes no car anybody actually owns.
Where does the fuel price come from?
The US Energy Information Administration weekly retail series. There is a real limitation worth knowing: EIA publishes a weekly price for only nine states. For the other forty-one this tool uses that state's EIA regional figure — the agency's own grouping — and tells you which of the two you are looking at, rather than presenting a regional number as if it were local.
How accurate is the depreciation figure?
It is a model, not a quote, and the tool labels it that way. The curve follows the well-established shape — steepest in year one, flattening after — adjusted by vehicle segment, because trucks and SUVs genuinely hold value better than large and luxury saloons. Actual resale depends on mileage, condition, colour, options and the used market on the day you sell, none of which any calculator can know in advance.
Why is my insurance estimate so far off?
Because insurance is priced on you, not on the car: your age, postcode, claims history, credit and mileage can move a premium by a factor of three for identical vehicles. The figure here is a segment-typical placeholder so the calculation runs. Replace it with the number on your actual renewal and the total becomes meaningful.
