Calculate Car Total Cost of Ownership

This calculator estimates a car’s total cost of ownership over a chosen number of years by adding its purchase price, financing interest, fuel, insurance, maintenance, repairs, fees, and estimated resale value. Enter your own cost estimates to get the net cost for the ownership period and an average monthly cost; the result is only as complete as the figures you provide.

Formula

The calculator estimates net ownership cost as the down payment plus all scheduled loan payments, running expenses, and other costs, minus the vehicle’s estimated resale value:

TCO = D + M × N + (F + I + U) × N + C − V

• TCO is estimated total cost in dollars.
• D is the down payment in dollars.
• M is the monthly loan payment in dollars.
• N is the ownership period in months: years × 12.
• F, I, and U are monthly fuel, insurance, and maintenance-and-repair estimates in dollars.
• C is the combined amount entered for other purchase and ownership costs, in dollars.
• V is the estimated resale value at the end of the period, in dollars.

The monthly payment uses the standard fixed-payment loan formula. If the amount financed is P = purchase price − down payment and monthly rate is r = APR / 1,200, then M = P × r / [1 − (1 + r)^−N]. Total interest is the rounded monthly payment multiplied by the number of payments, minus the amount financed. The calculator assumes the loan lasts for the entire ownership period; if it does not, this financing estimate will not match the actual payment schedule.

Worked Example

Using the calculator’s default inputs: purchase price $30,000, down payment $5,000, APR 8%, five years, fuel $180 per month, insurance $150 per month, upkeep $100 per month, other costs $1,000, and resale value $15,000.

1. Amount financed: $30,000 − $5,000 = $25,000. The term is 5 × 12 = 60 months, and the monthly rate is 8% ÷ 1,200 = 0.0066667.
2. Monthly payment: $25,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = $506.91, rounded to cents.
3. Loan payments over the term: $506.91 × 60 = $30,414.60. Fuel, insurance, and upkeep total $430 monthly, or $430 × 60 = $25,800. Add the $5,000 down payment and $1,000 other costs, then subtract $15,000 resale value.

Estimated total ownership cost: $5,000 + $30,414.60 + $25,800 + $1,000 − $15,000 = $47,214.60. Average net cost is $47,214.60 ÷ 60 = $786.91 per month. Estimated loan interest is $30,414.60 − $25,000 = $5,414.60.

Assumptions

• The loan has a fixed APR and equal monthly payments for the full ownership period.
• Payments are made monthly; interest is modelled monthly at APR divided by 12.
• Costs entered per month remain constant throughout the period.
• Other costs are a single combined total. Enter relevant costs such as sales or registration fees, taxes, parking, tolls, or loan charges only if they apply to your estimate.
• Resale value is a future estimate, not a guaranteed sale price. Depreciation is reflected by subtracting this value from the costs paid.
• The result does not automatically include costs you leave out, such as charging or fuel-price changes, tire replacement, deductibles, accident expenses, or the time value of money.

What Total Cost of Ownership Includes

A car’s sticker price is only one part of what it costs to own and use. Total cost of ownership (TCO) measures expenses over a defined period, then accounts for the value remaining when ownership ends. The result depends on the timeframe: a car kept for three years has a different resale estimate and maintenance history from the same car kept for ten.

Some vehicle-cost comparisons use annual mileage and a cost per mile. This calculator instead asks for monthly operating estimates, which can be convenient when you already know a household budget. To make comparisons meaningful, use the same ownership period and comparable assumptions for each car. Include a realistic resale estimate for each, rather than assuming every vehicle retains the same share of its purchase price.

How to Choose Estimates

Use amounts that reflect your expected use, location, and financing rather than relying on a generic average. Insurance quotes depend on individual and vehicle details, while fuel use depends on distance, driving conditions, and the car’s efficiency. Maintenance and repair spending can vary with age, condition, mileage, and warranty coverage.

• Fuel: Estimate monthly distance divided by expected efficiency, multiplied by the fuel price you want to assume. For an electric car, enter charging expense in this field.
• Insurance: Use a quote or your own expected premium for the vehicle and coverage you are modelling.
• Maintenance and repairs: Include routine servicing and a reasonable repair allowance. Do not count the same item again under other costs.
• Other costs: Add one-time and recurring costs not already represented. Since the field is a single total, calculate and combine them before entering it.
• Resale: Estimate the likely sale or trade-in value at the end of the period. Condition, mileage, demand, and market changes can affect it.

For a cash purchase, the calculator’s loan inputs need special care: the displayed financing formula assumes a positive amount financed and a loan. This tool requires a nonzero APR and computes a payment from purchase price minus down payment. It does not model a cash purchase with no loan; for that case, use the purchase price as a direct cost in a separate budget calculation rather than treating a loan payment as actual.

Limitations and Common Mistakes

The estimate is not an accounting of every possible cost. It does not discount future dollars, model changing prices, or adjust maintenance and resale estimates over time. It also assumes the chosen APR applies to the entire financed amount, without separately modelling fees or a changing balance. Get actual loan terms and costs from the lender or relevant service provider, then enter applicable figures carefully.

A frequent mistake is adding the full purchase price and all loan payments together. The calculator avoids that double count: it adds the down payment and scheduled payments, which together represent the amount paid toward the purchase plus financing interest. Another is forgetting that a trade-in or resale value is subtracted only once, at the end of the ownership period. Check that your other-cost total does not duplicate fuel, insurance, or upkeep.

Figures are rounded to cents for the payment and displayed totals. Real lender schedules may differ because of payment dates, fees, rounding conventions, or a term that does not match the ownership period. If you sell the car while a loan balance remains, the net proceeds may differ from the resale estimate used here.

Frequently Asked Questions

How do I calculate the total cost of owning a car?
Choose an ownership period, add the down payment and loan payments plus fuel, insurance, maintenance, and other costs, then subtract estimated resale value. Use consistent time periods and avoid counting any cost twice.

Is car depreciation included in total cost of ownership?
Yes, when you subtract the estimated resale value from the amounts paid. The difference between purchase-related spending and the vehicle’s value at sale represents depreciation within this simplified estimate.

Should I include a down payment and monthly payments?
Yes. Together they represent the cash paid toward the vehicle and its financing. Do not also add the full purchase price, because that would count the financed principal twice.

What is a good ownership period for a comparison?
Use the period you genuinely expect to keep the car, or choose the same period for every vehicle in a comparison. Resale value and likely maintenance costs change with time and mileage.

Does this calculator include taxes and fees?
Only if you include applicable amounts in the “Other purchase and ownership costs” input. It does not look up taxes, registration charges, parking, or any other local or vehicle-specific cost.

This result is an estimate for educational purposes, and the lender’s disclosure gives the exact figures.

Related

• Loan Payment Schedule With Amortization Explained
• Loan Payment Schedule Calculator: Free Monthly Breakdown
• Student Loan Repayment Start: When Payments Begin

in price | Purchase price | $ | 30000 | 0 | 100000000
in down | Down payment | $ | 5000 | 0 | 100000000
in apr | Loan APR | % | 8 | 0.01 | 100
in yrs | Ownership period | years | 5 | 0.0833 | 50
in fuel | Fuel cost per month | $ | 180 | 0 | 1000000
in ins | Insurance per month | $ | 150 | 0 | 1000000
in upkeep | Maintenance and repairs per month | $ | 100 | 0 | 1000000
in fees | Other purchase and ownership costs | $ | 1000 | 0 | 100000000
in resale | Estimated resale value | $ | 15000 | 0 | 100000000
out total | Estimated total ownership cost | $ | down + pmt * yrs * 12 + fuel * yrs * 12 + ins * yrs * 12 + upkeep * yrs * 12 + fees - resale | 2
out pmt | Estimated monthly loan payment | $ | (price - down) * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out monthly | Average net cost per month | $ | total / (yrs * 12) | 2
out interest | Total loan interest | $ | pmt * yrs * 12 - (price - down) | 2