Example input set
| Category | Assumption | Value |
|---|---|---|
| Ownership | Years owned | 5 |
| Driving | Annual miles | 12,000 |
| Inflation | Annual rate | 3% |
| Tires | Set cost / life | $1,100 / 40,000 mi |
| Brakes | Service cost / life | $550 / 80,000 mi |
| Filters | Cabin filter / interval | $35 / 1 yr |
| Fluids | Brake fluid / interval | $90 / 3 yrs |
| Thermal | Coolant service / interval | $180 / 5 yrs |
| Reserve | Unexpected repairs | $150 / yr |
Formula used
C and inflation r, the nominal sum over Y years is:
SumAnnual = C × Y when r = 0
SumAnnual = C × ((1+r)^Y − 1) / r when r > 0
k×Interval. Each service cost is inflated at its occurrence year:
ServiceTotal = Σ (UnitCost × (1+r)^(t_k))
floor(TotalMiles / LifeMiles). Costs are spread across the timeline, and inflated using an estimated year for each occurrence.
How to use this calculator
- Enter how many years you plan to keep the vehicle.
- Enter your yearly mileage to estimate total miles.
- Set an inflation rate to reflect future price growth.
- Adjust tire and brake costs and their expected lifetimes.
- Set service intervals for filters, fluids, alignment, and 12V battery.
- Add an annual reserve for unexpected repairs if desired.
- Press Calculate to view totals above the form.
- Use CSV or PDF to download your results.
Annual mileage drives the service calendar
The calculator converts your plan into total miles using AnnualMiles × YearsOwned. At 12,000 miles per year for five years, the estimate is 60,000 miles. Higher mileage accelerates tire replacement, rotations, and alignment checks, and it increases the chance you reach brake and 12V battery intervals sooner.
Wear items often dominate long ownership periods
Tires usually appear as a leading cost line because the set price is high and the life threshold is easy to cross. For example, a $1,100 set lasting 40,000 miles implies at least one purchase near mid‑ownership in many plans. Regenerative braking can extend pad and rotor life, but steep terrain and heavy loads still increase wear.
Time-based services protect comfort and safety
Cabin filters and wipers are small per visit, yet they recur frequently. Setting a one‑year interval for both creates a predictable baseline cost. Brake fluid, coolant, and alignment are less frequent; however, skipping them can raise risk and may increase expensive downstream repairs.
Inflation changes the future bill, not the schedule
The model keeps your service intervals constant, then inflates the cost at the time the service occurs. Annual items use a geometric series when the inflation rate is above zero. With 3% inflation, later‑year services cost more even if your driving pattern stays stable, which makes long plans more sensitive to the rate assumption. For longer horizons, test 0%, 3%, and 6% to bracket uncertainty and set a practical planning baseline.
Reserves make the estimate more realistic
EVs have fewer moving parts than many drivetrains, yet unexpected events still happen: suspension wear, punctures, sensors, or HVAC repairs. Adding a modest yearly reserve can stabilize your budget and reduce surprises. If you rarely visit a shop, set the reserve low and track actuals over time.
Use cost per mile to compare vehicles and habits
Cost per mile is total maintenance divided by total miles. It allows consistent comparisons across ownership lengths and driving styles. If the chart shows one category dominating, adjust only the related inputs first, then recalculate. Small improvements in tire life or fewer annual miles can reduce the metric quickly. Save your exports and compare them with real invoices quarterly to keep your assumptions current.
FAQs
Does this calculator include charging electricity costs?
No. It focuses on maintenance and service items like tires, fluids, inspections, and repair reserves. Add energy costs separately for a full ownership view.
Why are brake costs sometimes low for EVs?
Regenerative braking reduces friction brake use, so pads may last longer. Driving style, climate, corrosion, and terrain can still require brake servicing.
How is inflation applied to services?
Annual items grow using a year-by-year series. Periodic services apply inflation at the year the service is assumed to happen, so later services become more expensive.
What if my tire life is uncertain?
Run scenarios. Try a conservative life estimate and an optimistic one. Compare totals and cost per mile to see how sensitive your plan is to tires.
Should I include an unexpected repairs reserve?
Yes, if you want a steadier budget. Even reliable vehicles can need suspension work, sensors, or HVAC repairs. A small annual reserve improves realism.
Can I use this for a fleet or multiple EVs?
Yes. Calculate each vehicle with its own mileage and intervals, then export CSV or PDF for records. Summing totals gives a simple fleet maintenance forecast.