How to Calculate the True Cost of Car Ownership

A car’s monthly payment is only one part of what it actually costs to own and drive.

A car can seem affordable because its purchase price or monthly loan payment fits your budget. However, owning and driving it involves several other expenses, including depreciation, insurance, fuel, maintenance, repairs, taxes, and registration fees.

To understand what a car will really cost, calculate its expenses over the period you expect to own it. Then divide the total by the number of years, months, and miles you expect to drive.

This guide teaches you to calculate the true cost of car ownership in the United States.

The Basic Formula

Total Ownership Cost = Depreciation + Loan interest + Fuel or electricity + Insurance + Maintenance and repairs + Taxes and fees + Parking and tolls

One important rule is to avoid double-counting. If you include depreciation, add only the loan interest, not the full loan payments. Depreciation already accounts for the vehicle’s purchase price and resale value.

For a cash-flow calculation, add your down payment and loan payments, then subtract the net money you receive when selling the car. Do not add depreciation separately.

Step 1: Set Your Ownership Period

Decide how long you expect to keep the car and how many miles you will drive each year.

For example, keeping a car for five years and driving 15,000 miles annually gives you:

5 × 15,000 = 75,000 total miles

Use the same period and mileage when comparing vehicles. This makes the results easier to evaluate.

Step 2: Calculate Each Expense

1. Depreciation

Depreciation is the value your car loses over time.

Depreciation = Purchase price − Expected resale value

For example, a car purchased for $30,000 and sold for $15,000 after five years loses $15,000 in value, or $3,000 annually.

Estimate resale value using listings and valuation guides for vehicles with similar age, mileage, condition, and history. Use the vehicle price before separately listed taxes and fees to avoid counting those expenses twice.

2. Loan Interest

Compare loans using their APR, term, and total interest, not just the monthly payment.

The Consumer Financial Protection Bureau gives an example of a $20,000 loan at 4.75% interest. A 36-month loan costs $1,498 in interest, while a 72-month loan costs $3,024.

A longer term reduces the monthly payment but increases total interest. If you sell the car before the loan ends, include only the interest paid during ownership.

3. Fuel or Electricity

For gasoline vehicles, use:

Annual Fuel Cost = (Annual miles ÷ MPG) × Price per gallon

For example, driving 15,000 miles in a vehicle averaging 30 MPG, with gasoline at $4.15 per gallon, costs:

• 15,000 ÷ 30 = 500 gallons.
• 500 × $4.15 = $2,075 annually.
• Five-year cost = $10,375.

For electric vehicles, use:

Annual Charging Cost = (Annual miles ÷ 100) × kWh per 100 miles × Price per kWh

At 15,000 miles, 30 kWh per 100 miles, and $0.18 per kWh, charging costs approximately $810 annually.

Use FuelEconomy.gov to check vehicle efficiency. For electric vehicles, include both home and public charging costs if you use both.

4. Insurance

Insurance premiums depend on your location, driving history, vehicle, coverage, and deductible.

Get quotes from several insurers for the exact vehicle. Compare policies with similar coverage and deductibles, then multiply the annual premium by the number of years you expect to own the car.

5. Maintenance and Repairs

Include scheduled servicing, tires, brakes, batteries, and other likely repairs. Check the manufacturer’s maintenance schedule and ask a mechanic or dealer for estimates.

For used vehicles, arrange an independent inspection and review the service history. Set aside a repair allowance, especially if the car is older or its maintenance history is unclear.

6. Taxes, Fees, and Other Expenses

Check your state or local motor vehicle agency for sales tax, title, registration, inspection, and other applicable fees.

Also include regular expenses such as parking, tolls, roadside assistance, and seasonal tire storage. Only count expenses that apply to your situation.

Step 3: Calculate the Total

After adding every expense, use these formulas:

• Annual Cost: Total ownership cost ÷ Years owned.
• Monthly Cost: Annual cost ÷ 12.
• Cost Per Mile: Total ownership cost ÷ Total miles driven.

The monthly figure is an average, not a monthly bill. Some expenses occur annually or only when repairs are needed.

Example

Suppose you buy a $30,000 car, keep it for five years, drive 15,000 miles annually, and sell it for $15,000.

The estimated cost is:

• Per year: $9,375.
• Per month: $781.25.
• Per mile: $0.625.

The example assumes you finance the full $30,000 over 60 months at about 3.8% APR. The loan interest is rounded to $3,000.

Compare Different Vehicles

Use the same ownership period and annual mileage when comparing cars. Include every major expense, not just purchase price or fuel economy.

This is particularly important when comparing gasoline, hybrid, and electric vehicles. Electric cars may save money on energy, but depreciation, insurance, and purchase price can offset those savings. Hybrids may also have lower fuel costs than comparable gasoline models.

Compare the specific vehicles you are considering using local energy prices, insurance quotes, maintenance estimates, and expected resale values.

Final Thoughts

The true cost of car ownership includes every major expense you face while using the vehicle, not just its purchase price or monthly payment.

Estimate each cost using realistic mileage, local prices, actual quotes, and expected resale value. Then compare vehicles over the same ownership period.

The best choice is not necessarily the cheapest car to buy. It is the one that meets your needs at a total cost you can comfortably afford.