Total Cost of Ownership Calculator
Calculate the full lifetime cost of owning a car, including depreciation and running expenses.
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What this tool does
This calculator combines depreciation with recurring running costs to estimate the total cost of ownership (TCO) for a vehicle. It applies compound annual depreciation to the purchase price, adds fuel, insurance, and servicing costs over the ownership term, and returns the aggregate cost. The depreciation model assumes a constant annual percentage rate; actual resale values vary with market conditions, mileage, and vehicle condition.
How Total Cost of Ownership Calculator works
The tool aggregates two categories: capital cost (depreciation) and recurring expenses (fuel, insurance, servicing). Depreciation is modelled as a compound percentage applied annually to the purchase price; the difference between purchase price and residual value represents the capital lost over the ownership term. Running costs are summed per year and multiplied by the number of years owned. The calculator returns the combined total and breaks out each component, including cost per year and projected residual value.
The formula
Residual value = Purchase price × (1 − r)^n
where r = depreciation rate (as a decimal) and n = ownership years.
Total depreciation = Purchase price − Residual value
Total running costs = (Fuel per year + Insurance per year + Servicing per year) × n
Total cost of ownership = Total depreciation + Total running costs
Where this method is most accurate
The compound depreciation formula approximates vehicles whose value declines by a consistent percentage each year. It does not account for step-function drops (first-year versus subsequent years), mileage adjustments, or specific make/model market premiums. Running-cost estimates assume stable annual expenditure; real-world fuel prices, insurance premiums, and servicing schedules vary. The model is most useful for comparing ownership scenarios with similar inputs rather than predicting exact resale values.
What this tool does not do
It does not incorporate financing costs (interest on loans), road tax, parking fees, annual vehicle inspection fees, or repairs outside routine servicing. The depreciation rate is an input, not calculated from market data; users must estimate or research rates for their vehicle category. The calculator does not adjust for inflation, regional cost differences, or changes in driving patterns over the ownership period.
Disclaimer
This calculator is an educational tool that performs arithmetic on user-supplied figures. It does not constitute financial advice, vehicle valuation, or a guarantee of actual costs. Real-world depreciation, fuel consumption, insurance premiums, and servicing expenses vary with market conditions, driving behaviour, vehicle condition, and maintenance history. Always verify costs with sellers, insurers, and service providers before making purchase or ownership decisions.
Questions
- Why does the calculator use compound depreciation instead of straight-line?
- Compound (or declining-balance) depreciation models the fact that cars lose a larger absolute amount in early years and smaller amounts as value approaches zero. Most vehicles follow this pattern more closely than a constant annual drop.
- What depreciation rate should I enter?
- Typical passenger cars depreciate 10–20% per year; luxury and electric vehicles may depreciate faster in early years, while rare or classic models may depreciate more slowly or even appreciate. Research historical resale data for your specific make and model.
- Does the total include finance charges?
- No. The calculator treats the purchase price as a cash outlay. If financing, use a separate loan calculator to estimate interest, then add that cost to the TCO manually.
- Can I use this for leasing?
- The tool is designed for ownership scenarios where depreciation affects the owner. For a lease, substitute total lease payments for the depreciation component and zero out the residual value if the car is returned.
- How accurate is the residual value estimate?
- The estimate assumes a constant annual depreciation rate and does not account for mileage, condition, or market shifts. Actual resale values vary; check used-car price guides and recent sales for similar vehicles to refine the depreciation input.
Sources & Methodology
The calculator applies compound annual depreciation—Residual = Purchase price × (1 − r)^n—to determine capital cost, then adds the product of annual running expenses (fuel, insurance, servicing) and ownership years. This additive TCO model is standard in fleet management and consumer automotive analysis.