Car ownership cost calculator that adds price, interest, fuel and insurance, then subtracts resale value
Enter the vehicle price and loan terms on the left, then mileage, fuel price, insurance and registration, and the right side shows the true cost over the whole ownership period along with the cost per month and per mile and where the money goes. Below that sit the cumulative cost and resale value curves and a table of what leaves your account each year. There is no calculate button; every change recomputes immediately.
This calculator subtracts what the car will still be worth when you sell it, then adds the loan interest and the running costs you actually paid. Insurance, registration and maintenance are not estimated for you; the tool uses exactly what you type. Resale value is an estimate produced by applying your depreciation rate once per year, so it will differ from a real trade-in quote.
- Per month
- — True cost divided by years times 12
- Per day
- — True cost divided by years times 365
- Per mile
- — True cost divided by total miles driven
- Total spend
- — Price plus loan interest plus running costs
- Resale value
- — What the car is worth when you sell it
- Loan interest
- — Interest actually paid while you own the car
| Year | Cost that year | Cumulative cost | Value at year end |
|---|
ready to use.
- Visible firstKeep the input and result positions clear.
- Results firstPut the main number up front and keep the process secondary.
- Less to askNo sign-up or extra information before using the tool.
What a car actually costs to own
Most people judge a car by one number: $32,000. Yet if that car sells for $14,199 after five years, the money actually lost to the vehicle itself is $17,801, not $32,000. Over those same five years another $10,178 went into fuel, $10,000 into insurance and $6,000 into parking and tolls. The gap between the sticker-price view and the all-in view is exactly that wide.
This tool puts both views on one screen. It adds up everything that leaves your account, subtracts what comes back when you sell, and converts the remainder into a monthly figure and a cost per mile. Below, the reasons behind each number are worked out in full: why depreciation is always the largest line, why loan interest is counted only for the years you own the car, and why the fuel price sits in an editable field instead of being hidden in the code.
What you lose is the price minus the resale value, not the price
The whole calculation is three lines. Add up what leaves your account over the ownership period, subtract what the car is worth when you sell it, then divide the remainder by the months and the miles. The table below uses the on-screen defaults and matches the tool figure for figure, including the rounding.
- Total spend = vehicle price + loan interest paid while you own it + (fuel + running costs) × years
- Resale value = vehicle price × (1 − depreciation rate) raised to the number of years
- True cost of ownership = total spend − resale value
- Per month = true cost ÷ (years × 12); per mile = true cost ÷ total miles driven
| Item | Value | How it is derived |
|---|---|---|
| Monthly loan payment | $537.18 | $27,000 amortised over 60 months at 7.2% |
| Total loan interest | $5,231 | Sum of 60 payments less the $27,000 principal |
| Fuel per year | $2,036 | 13,500 mi ÷ 27 MPG × $4.071 |
| Running costs per year | $4,300 | Insurance 2,000 + registration 200 + maintenance 900 + (parking 60 + tolls 40) × 12 |
| Resale value after 5 years | $14,199 | $32,000 × (1 − 0.15) to the fifth power |
| Total spend | $68,909 | Price + interest + (fuel + running costs) × 5 years |
| True cost of ownership | $54,710 | Total spend less the resale value |
| Per month | $912 | True cost ÷ 60 months |
| Per mile | $0.81 | True cost ÷ 67,500 miles |
The order to fill things in, and which boxes are monthly
A vehicle price on its own is enough to produce a result. Empty boxes fall back to the faint example numbers, and the moment you type something the tool switches to your value. The easy mistake is the five running-cost boxes: parking and tolls are monthly, while insurance, registration and maintenance are yearly. The unit sits in brackets next to each label.
- Put the out-the-door price in, including sales tax, title, registration and dealer fees.
- Choosing cash hides the down payment, term and APR boxes.
- Years owned accepts 1 to 25. Use the number of years you actually plan to keep it.
- For yearly mileage, multiply your round-trip commute by working days and add weekend driving.
- Parking and tolls are monthly; insurance, registration and maintenance are yearly.
- Adjust the depreciation rate using the guidance further down.
Why depreciation is always the biggest line
On the default settings, $17,801 of the $54,710 spent over five years is depreciation, which is 32.5% of the total. That is larger than fuel at 18.6% and more than three times the loan interest. It never shows up as a payment, which is why it is so easy to leave out. At 15% a year, a $32,000 car is worth $27,200 after one year, $19,652 after three and $14,199 after five.
- The first year alone costs $4,800 in lost value, more than twice that year of fuel.
- Declining-balance depreciation front-loads the loss, so the early years hurt most.
- Models with strong resale hold at 12–13% a year; luxury and many EVs run 17–20%.
- Moving the rate by one percentage point shifts the five-year true cost by hundreds of dollars.
Loan interest counts only for the years you keep the car
Interest is amortised the way a real auto loan works. Borrowing $27,000 over 60 months at 7.2% gives a payment of $537.18 and $5,231 of interest in total. If you sell before the loan ends, only the interest actually paid inside your ownership window is counted; the outstanding principal is treated as settled out of the sale proceeds, which is why it nets against the resale value rather than appearing twice.
- Choosing cash sets interest to zero and removes it from the breakdown.
- A larger down payment cuts the principal, and the interest falls in the same proportion.
- At the same APR, a longer term always produces more total interest.
- APR accepts 0% to 30%. Enter 0 for a promotional zero-percent deal.
Why the fuel price sits in a field instead of the code
Pump prices move week to week. A constant buried in the source keeps producing confident answers with a stale number long after anyone could notice. So the price is a field, the reference date is printed here, and the seeded value is the EIA weekly national average for the week ending 2026-08-31: $4.071 a gallon for regular and $5.599 for on-highway diesel.
- Switching the fuel type refills both the price and the economy with that fuel’s defaults.
- Your last few receipts beat any national average, especially in California or the Rockies.
- Premium runs roughly 70 cents above regular; use the grade your car actually requires.
- If you reopen this page months later, check the price field first.
Use your observed MPG, not the window sticker
EPA combined ratings come from a standard test cycle and typically overstate what drivers see by around 15 to 20%. Cold starts, stop-and-go traffic, air conditioning, roof boxes and a heavy right foot all take a bite. The simplest fix is to read the lifetime average off the trip computer; to measure it yourself, divide the miles between two full tanks by the gallons it took to refill.
- The trip computer’s lifetime average is accurate enough for this calculation.
- To measure manually, divide miles driven by gallons added, averaged over two or three tanks.
- For mostly city driving, take 15–20% off the EPA combined figure.
- Dropping from 27 to 22 MPG adds $2,313 to the five-year fuel bill on the default settings.
For an EV the economy box becomes mi/kWh and the price box becomes $/kWh
Selecting Electric changes the economy unit to miles per kilowatt-hour and the price unit to dollars per kilowatt-hour. The hard part is that charging costs depend on whether you plug in at home overnight or use a DC fast charger on a road trip, and no verifiable national retail average exists. That is why this one value is seeded as an editable assumption rather than pulled from a survey. Read the rate off your utility bill or your charging app.
- At 3.5 mi/kWh and 13,500 miles a year you use about 3,857 kWh.
- At $0.17/kWh that is $656 a year; at $0.40 on public fast charging it is $1,543.
- Home charging on an off-peak rate is usually the cheapest number you can enter here.
- EVs often carry a separate annual registration surcharge; put it in the registration box.
Insurance and registration are inputs because they are not national numbers
Insurance is the second-largest line on the default settings at $10,000 over five years, or 18.3% of the total, and it varies more by driver and ZIP code than by car. Registration is worse: some states charge a flat plate fee under $100, while Virginia, Connecticut and several others levy an annual personal property tax that runs into the hundreds on a newer vehicle. Neither can be estimated honestly from a single national figure, so both stay in your hands.
- Use the premium on your renewal declaration page, not a rough guess.
- Adding a driver under 25 can double the premium on the same vehicle.
- Check whether your state charges a flat fee or an annual value-based tax.
- EV and hybrid surcharges, emissions testing and county wheel taxes all belong in the registration box.
Parking and tolls decide more outcomes than people expect
On the defaults, parking and tolls together come to $6,000 over five years, 11% of the total. That is with a modest $60 a month. A reserved space in a dense city at $300 a month turns the same line into $18,000 and moves the monthly cost of ownership by $200. If you are deciding whether to own a car at all rather than which car to buy, this box often settles it.
- If you park free at home and at work, set this to zero and recalculate.
- Add employer parking, residential permits and airport parking you pay regularly.
- Going from $60 to $300 a month adds $14,400 over five years.
- Toll transponder statements give you a reliable monthly figure.
The year-by-year table tells you when to sell
The last column is the car’s value at the end of that year and the third column is everything spent up to that point. Read them together and the exit point becomes visible. On the defaults the monthly cost is $991 if you sell after three years, $912 after five, $849 after seven and $786 after ten. It falls because the steep early depreciation is already behind you.
- Year one costs $12,928 against $9,086 in year five, a 42% difference.
- This is the arithmetic behind buying a two or three year old car instead of new.
- Longer ownership does raise maintenance, so raise that box before trusting the ten-year figure.
- The final row of the table is always the year you sell.
What this calculation does not answer
The maths projects the conditions you typed into the future. Real ownership is bumpier than that. In the situations below the result will drift from what you actually pay.
- Leasing — the monthly payment bundles depreciation and often maintenance, so the line items do not line up with this tool.
- Business use — depreciation schedules and mileage deductions change the after-tax number entirely.
- Accidents — deductibles and premium increases after a claim cannot be projected; leave headroom in maintenance.
- Used cars — depreciation is slower but repairs are heavier. Lower the rate and raise maintenance.
- Fuel and rate volatility — the price and APR you enter are assumed to hold for the whole period.
- Incentives — federal or state EV credits should be reflected in the price you enter, not added later.
Six things to check before you sign
Running the numbers is only useful if the inputs are honest. This short pass catches the mistakes that show up most often.
- Does the price include tax, title, registration and dealer fees? Leaving them out understates the result by a few thousand dollars.
- Is the fuel price close to your last receipt? The national average is not the price in your county.
- Can you actually cover the monthly figure? If it reads $912 and your room is $600, the answer is a cheaper car, not a longer loan.
- Have you priced insurance for this specific vehicle? Quotes on the same driver vary by hundreds between models.
- Is parking solved? An empty parking box hides a real recurring cost.
- Is the ownership period realistic? If you trade every three years, the five-year figure flatters the deal.
Sources and reference dates
Content reference date for this page is 2026-09-05. The fuel prices seeded on screen come from the U.S. Energy Information Administration weekly retail survey for the week ending 2026-08-31: regular gasoline $4.071 per gallon and on-highway diesel $5.599 per gallon. Registration and vehicle taxes vary by state, so they stay user inputs. The electricity price is an editable starting value because no national average retail charging price is published in a form that can be verified.
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Car ownership cost questions
How much does it really cost to own a car per month?
It depends entirely on whether depreciation is included, and that changes the answer by about 40%. On the default settings, a $32,000 car kept five years costs $912 a month once the loss in value is counted. Strip the car itself out and the running costs alone — fuel, insurance, registration, maintenance, parking — come to $528 a month. When people say "it only costs me $500 a month", they usually mean the second number, while the first is what actually leaves the account.
There is no calculate button. When does it update?
The moment you change anything. Type a vehicle price and the results, the breakdown, the year-by-year chart and the table all refresh together. The same happens when you switch fuel type or payment method. Money fields add thousands separators while you type, so you only need to press the digits.
What is the difference between total spend and true cost of ownership?
Total spend is every dollar that left your account. True cost of ownership subtracts what comes back when you sell. On the defaults that is $68,909 spent, $14,199 recovered and $54,710 of true cost. The second number is the one to compare between cars, and the seven items in the breakdown add up to exactly that figure.
Where does the 15% depreciation rate come from?
It is a widely used rule of thumb, not an official rate, which is why it is an editable field rather than a hidden constant. Trucks and models with strong resale hold nearer 12–13% a year; luxury sedans and many electric vehicles fall faster at 17–20%. For a specific model, look up listings of the same year and mileage, divide the asking price by the original price and solve for the annual rate.
Is it better to pay cash or finance?
In this tool, financing adds the interest to your true cost — $5,231 on the default settings. Paying cash removes that line but ties up $32,000 that could be earning elsewhere. At a 7.2% APR you would need a reliable after-tax return above 7.2% for financing to come out ahead, which is a high bar for money you might need. Run both and compare the true cost figures directly.
Do electric cars actually cost less to own?
Fuel and maintenance are cheaper; the purchase price and the depreciation are usually not. At 3.5 mi/kWh and $0.17/kWh, 13,500 miles a year costs $656 against $2,036 for a 27 MPG gasoline car — a saving of $1,380 a year. But a $45,000 EV depreciating at 18% loses far more value than a $32,000 car at 15%, and many states add an annual EV registration surcharge. Press the two presets in turn and compare the true cost figures.
What should I put in the registration and taxes box?
Whatever your state actually bills you each year. Some states charge a flat renewal fee under $100. Others, including Virginia and Connecticut, levy an annual personal property tax based on the vehicle’s assessed value, which can exceed $500 on a newer car and then falls each year. Many states now add an EV or hybrid surcharge on top. Your last renewal notice is the reliable source.
How much should I budget for insurance?
Use the premium on your renewal declaration page for the specific vehicle. Without a quote, the drivers are age, ZIP code, coverage limits and the car itself. A clean record in a low-cost state with liability-only coverage can be under $1,000 a year; full coverage on a new car with a driver under 25 in a dense metro can pass $4,000. Because the spread is that wide, the tool never guesses for you.
Can I use this for a used car?
Yes, with two adjustments. Lower the depreciation rate, because the steepest part of the curve has already happened; 10–12% a year is realistic for a three-year-old vehicle. Then raise maintenance, because the factory warranty is gone and wear items come due together. Budgeting 1.5 to 2 times the new-car maintenance figure is a safer starting point. Put the purchase price plus tax and title in the price box.
How do I compare this against leasing?
Take the monthly true cost from this tool and set it next to the lease payment, but check what each number covers first. A lease payment covers depreciation and financing and sometimes maintenance, while insurance, fuel and registration stay yours. So keep the ownership figure whole and add the lease-side items that are not in the payment. Include the disposition fee and any mileage overage you expect at the end.