Car TCO Calculator

What car TCO means

TCO (Total Cost of Ownership) for a car is the sum of every cash flow tied to owning it over a chosen horizon: not the sticker price and not the monthly payment alone. In this calculator, TCO equals: the amount for the car (cash, down payment + loan payments, or lease upfront + payments), plus energy (fuel or electricity), insurance, service, tax/fees and other costs multiplied by the number of ownership years, minus the estimated resale value at the end of the period (cash and loan only). A simplified lease does not subtract residual: the car goes back to the lessor. It is the number that answers "what will this car actually cost me", rather than "what does it cost to buy".

The calculator serves three groups: buyers comparing two specific cars (the "Compare Car A vs B" mode), owners deciding whether to keep their current car or replace it, and people weighing a gas car against an EV. Typical decisions: can I afford this car within my monthly budget, which of two options is cheaper over the full period, and whether a cheap used car is really cheap once insurance, service, and value loss are added.

What is included in this calculator's TCO

The model sums the items and subtracts one, in the order they appear on the form:

• Car cost by finance type: cash (full price upfront), loan (down payment + annuity payments with principal and interest), or lease (upfront + payments × months). Loan payments already include interest, so it is never added twice.
• Energy: ICE/hybrid: (km / 100) × L/100 km × price/L; EV: (km / 100) × kWh/100 km × energy price. Annual × years.
• Insurance: an annual amount multiplied by the ownership years.
• Service, repairs, and tires: an annual amount multiplied by the years; it does not model individual, unplanned breakdowns unless you enter them.
• Registration and other tax: registration, property tax on vehicles, or state inspection, depending on your state.
• Other: parking, car wash, tolls, EZ-Pass.
• Resale (subtracted once, cash and loan): a blank field defaults to ~40% of purchase price. On a simplified lease this field is hidden: returning the car does not credit residual to you.

The energy type changes the fields: for gasoline, diesel and hybrid you enter economy and the pump price (for a hybrid, use a blended annual figure covering both gas and electric driving); for an EV you enter energy use in the header unit (kWh/100 km or kWh/100 mi) and the electricity rate. The model does not distinguish home charging from DC fast charging: the result is a planning estimate.

How to read TCO, monthly cost, and cost per km

The calculator shows three complementary numbers, each answering a different question:

• Total cost (TCO): every amount spent and recovered over the ownership period. The right number for comparing "option A vs. option B" over the same time horizon.
• Monthly cost (average): TCO divided by the number of months. Useful for checking against a monthly budget, but it is an average: payments, insurance, and service do not fall evenly in every single month.
• Cost per km: TCO divided by total mileage over the period. The best number for comparing two cars driven different annual distances, since it neutralizes differences in distance covered.

For a household budget, monthly cost usually matters most. For judging whether the car is efficient given how you actually drive, cost per km is the better metric.

Comparing two cars with TCO (A vs B)

The mode toggle at the top of the form lets you cost one car or two side by side. In Compare Car A vs B you fill two panels, each with its own powertrain, financing, and costs. The calculator runs both through the same formula. The two cars can differ in everything: gas vs electric, loan vs cash, new vs used, different annual mileage.

The comparison result has four parts: a winner line (which car has the lower TCO and by how much), mini cards for A and B with TCO, monthly cost and cost per km, delta cards (Δ TCO, Δ monthly, Δ per km), and a decision sentence naming the category (capital, price/financing/resale, energy, or fixed costs) that explains most of the gap. A dual chart shows the A and B bars side by side for each category, so you can see instantly where the difference comes from. Two cars can reach a similar TCO for completely different reasons.

EV vs gasoline cost logic

When comparing an EV with a gas car, the energy line is usually lower for the EV: home charging per 100 miles is often cheaper than gasoline, especially at high mileage. Energy is typically not the largest TCO line. The result is more often decided by purchase price, insurance (sometimes higher for a more expensive car), and resale, which can move quickly with used-EV supply and incentives.

So an honest comparison costs both cars in full, not just fuel or charging for 100 miles. Energy use is calculated from the numbers you enter, but it does not model battery degradation, winter range loss, battery replacement, or the gap between a home rate and DC fast charging. Enter the EV trade-in yourself if you know the market: the default about 40 percent is a simplification for every powertrain. At high mileage cheaper electricity can close a price gap; at low mileage a cheaper gas car often wins on TCO.

Cash vs loan vs simplified lease

The finance type changes how the "for the car" part is calculated:

• Cash: the full purchase price is paid upfront, with no interest. If you enter a down payment smaller than the price, we still assume the rest is paid in cash right away (cost of capital = full price). TCO = price + running costs − resale.
• Loan: down payment plus a fixed annuity payment based on the interest rate and loan term. The payment total includes interest, shown separately in a note so it is not counted twice. If the ownership period is shorter than the loan, TCO includes payments made in that period and the remaining principal at sale. This matches the classic car-on-loan TCO model.
• Lease (simplified): upfront payment plus monthly payment × number of months (to the end of the lease or ownership period, whichever is shorter). Residual is not subtracted: you return the keys, and that value stays with the lessor. This is a simplified model, not a full quote: it does not include a money factor, mileage cap, excess-wear fees, or a buyout. Deliberately simple, to compare orders of magnitude: not to replace a leasing quote.

Watch out for double counting: with a loan the interest is already inside the payments, and with a lease the financing cost is already inside the monthly payment: do not add it separately. For an exact payment-only comparison, use the "Leasing vs loan" calculator.

Hidden costs drivers overlook

The biggest underestimates in back-of-envelope math are usually not fuel: fuel is the most visible cost because you pay for it weekly. The costlier items tend to be the ones that show up less often or are buried inside another number:

• Value loss and resale: underestimating depreciation, or ignoring resale altogether, makes TCO look artificially low. In this calculator resale is the only item that lowers cost: understating it inflates the real ownership cost.
• Interest "hidden" inside the payment: a lower monthly payment from a longer loan term often means more total interest. The results show total interest separately in the note under the cost breakdown, so it stays visible.
• Insurance in big cities: the same car can cost 2-3× more to insure in a major city than in a rural area; it is an easy line item to misjudge from memory.
• Tires, parking, tolls, car washes: small individually, but often several hundred to a few thousand dollars per year in total.
• Cost of capital: money put into a down payment (or the full purchase price if paid in cash) is not working anywhere else. This calculator does not model that as an opportunity cost, but it is worth remembering when comparing buying vs. leasing.

How mileage changes the result

Annual mileage changes which costs dominate TCO. At low mileage (about 10,000–13,000 km a year) energy is a relatively small line: payments, insurance, registration, and depreciation still run whether the car is driven or parked. At high mileage (24,000–32,000 km a year and up) fuel or charging and distance-based service scale up and can overtake those fixed costs.

Annual mileage changes which costs dominate TCO. At low mileage (about 6,000–8,000 miles a year) energy is a relatively small line: the payment, insurance, registration, and depreciation still run whether the car is driven or parked. At high mileage (15,000–20,000 miles a year and up) gas or charging and distance-based service scale up and can overtake those fixed costs.

The practical consequence: at low mileage, a consumption gap between two cars has only a small effect on TCO: purchase price, resale, and insurance matter more. At high mileage that same gap turns into real hundreds or thousands of dollars per year, and cost per km becomes a more reliable metric than monthly cost. That is also where an EV's cheaper energy helps most.

The practical consequence: at low mileage, a consumption gap between two cars has only a small effect on TCO: purchase price, resale, and insurance matter more. At high mileage that same gap turns into real hundreds or thousands of dollars per year, and cost per mile becomes a more reliable metric than monthly cost. That is also where an EV's cheaper energy helps most.

Why value loss can matter more than fuel

The instinct "buy an efficient car to spend less" often misjudges what actually drains the most money in TCO. A new, expensive, efficient car can lose more in value over 5 years than an older, cheaper car with higher fuel use spends extra on fuel over the same period: especially at low or medium mileage.

A simple worked number: a gap of about 2 L/100 km at 19,300 km a year and a fuel price of about 0.92 per liter is a few hundred dollars a year in extra fuel. The depreciation gap between two cars with the same starting price can exceed that in year one. When you compare two cars, use both the resale field and compare mode.

A simple worked number: a 5 mpg gap at 12,000 miles a year and $3.49 a gallon is about $280 a year in extra gasoline. The depreciation gap between two cars with the same starting price can exceed that in year one. When you compare two cars, use both the resale field and compare mode.

Limits and assumptions of the model

• Fuel and electricity prices are held flat for the whole period: the calculator does not forecast price changes or inflation.
• Service and repairs are a single averaged annual amount you enter: the model does not simulate individual, irregular breakdowns; add a reserve inside "maintenance" if you want one.
• If you leave resale value blank on cash or loan, the calculator estimates it at ~40% of purchase price. A simplified lease does not subtract residual.
• There is no time discounting (NPV) and no inflation applied to running costs: every total is nominal.
• For EVs the model calculates energy use from your inputs but does not account for battery degradation, winter range loss, battery replacement cost, or the difference between home and fast charging.
• For hybrids, enter a blended annual consumption covering both driving modes: the model does not split gasoline and electric miles.
• The loan payment is a fixed annuity; the lease is simplified: no money factor, mileage cap, wear fees, or buyout.

What the result is not

The result is total cost of ownership from the numbers you enter. It is not a dealer invoice, not a lender APR, and not a used-car appraisal. Trade-in is the figure you type or the 40 percent placeholder on cash or loan. The lease path does not subtract residual, and does not use a money factor, a mileage cap, or wear fees.

The calculator does not pull live gas prices, insurance quotes, or residual-value feeds. For a running-cost year without purchase and resale, use the car running costs calculator.

Scenarios A–H

Figures below also have a metric twin. Presets convert into the units in the header.

Figures below use US gallons, miles, and mpg, matching a typical US header. The formula is miles ÷ mpg × price per gallon.

These examples use the same formula as the form. Click a scenario button above, then Calculate. Amounts are in the currency from the header; the scenarios are built for a US dollar budget.

• A. City, compact, low mileage (gas, loan): price 28,000, down 5,000, loan at 6.9% for 5 years, 8,000 miles/year, 32 mpg, $3.49/gal, insurance 1,600/year, service 800/year, registration 350/year, other 500/year, 5-year period, trade-in 11,000. Loan payments about 27,260 (about 4,260 interest). TCO ≈ 41,870, monthly ≈ 698, cost per mile ≈ 1.05. Takeaway: at low mileage, the loan and depreciation outweigh gasoline by itself.
• B. Family SUV, higher mileage (gas, loan): price 42,000, down 7,000, loan at 7.2% for 5 years, 15,000 miles/year, 24 mpg, $3.49/gal, insurance 2,000, service 1,200, registration 450, other 700, 5 years, trade-in 18,000. Loan payments about 41,780 (about 6,780 interest); fuel about 10,910. TCO ≈ 63,440, monthly ≈ 1,057, cost per mile ≈ 0.85. Takeaway: at 15,000 miles a year fuel grows, but a solid trade-in keeps cost per mile in check.
• C. Used, cash, pricier service: price 14,000, cash, 10,000 miles/year, 26 mpg, $3.49/gal, insurance 1,800, service 2,200, registration 280, other 400, 4 years, trade-in 6,000. TCO ≈ 32,090, monthly ≈ 669, cost per mile ≈ 0.80. Takeaway: a low price and no interest still lose if repairs run high.
• D. EV, city, cash: price 39,900, cash, 10,000 miles/year, 28 kWh/100 mi, electricity 0.16/kWh, insurance 1,800, service 450, registration 350, other 400, 5 years, trade-in 16,000. Energy about 2,240. TCO ≈ 41,140, monthly ≈ 686, cost per mile ≈ 0.82. Takeaway: cheap charging helps, but the sticker and value loss still dominate.
• E. Compare: gas vs EV: use Compare: gas vs EV. At 12,000 miles a year a 30,000 gas compact on a loan vs a 42,000 EV paid in cash: the EV can win on TCO here (about 43,340 vs 46,860) because charging is cheap and there is no interest. Raise mileage and that gap usually grows. Click the preset and Calculate to see the Δ cards.
• F. Compact, simplified lease: price 32,000, due at signing 2,500, payment 429 for 3 years, 12,000 miles/year, 31 mpg, $3.49/gal, insurance 1,500, service 600, registration 300, other 400, 3-year period. Lease payments total 15,444. Residual is not subtracted (the car is returned). TCO ≈ 30,400, monthly ≈ 844, cost per mile ≈ 0.84. Takeaway: this lease is cash out of pocket, not a money-factor quote and not a residual gift.
• G. Hybrid, cash, blended mpg: price 32,000, cash, 12,000 miles/year, 48 mpg, $3.49/gal, insurance 1,700, service 700, registration 320, other 450, 5 years, trade-in 14,000. Energy about 4,360. TCO ≈ 38,210, monthly ≈ 637, cost per mile ≈ 0.64. Takeaway: high mpg keeps the fuel line down; cash and depreciation still weigh.
• H. Pickup, loan, high mileage: price 45,000, down 8,000, loan at 7.1% for 5 years, 18,000 miles/year, 20 mpg, $3.49/gal, insurance 1,700, service 1,100, registration 400, other 600, 5 years, trade-in 20,000. Loan payments about 44,060 (about 7,060 interest); fuel about 15,710. TCO ≈ 66,770, monthly ≈ 1,113, cost per mile ≈ 0.74. Takeaway: at 18,000 miles a year fuel is large, but cost per mile still drops because of the distance.

• A. City, compact, low mileage (gas, loan): price 28,000, down 5,000, 6.9% for 5 years, 12,875 km/year, 7.35 L/100 km, 0.92/L, same fixed costs as the US list. TCO ≈ 41,870.
• B. Family SUV: 42,000, 15,000 miles equivalent (24,140 km), 9.8 L/100 km. TCO ≈ 63,440.
• C–H: same dollar amounts as the US list; switch the header to US units to see mpg and gallons, or keep metric and enter the liter figures above.

Model assumptions (at a glance)

• Fuel and electricity prices: held flat for the whole period, with no inflation.
• Resale: on cash or loan a blank field defaults to ~40% of purchase price. A simplified lease does not subtract residual.
• Loan: fixed annuity; interest is already in the payment total: never add it again. If ownership is shorter than the loan, TCO includes payments in that period plus remaining principal. Lease: payments × months + upfront; residual is not subtracted.
• Cash: the full price is paid upfront, cost of capital = full price.
• EV: energy computed directly from kWh per 100 distance units and electricity price; no battery degradation, winter range loss, or replacement cost.
• Hybrid: one blended annual consumption covering combustion and electric driving.
• No time discounting (NPV) and no inflation: the result is a nominal total.