Estimate how much usable capacity an electric vehicle battery may have lost based on age, distance driven, charging throughput, heat exposure, and DC fast-charging use. The result combines transparent user-adjustable assumptions rather than diagnosing the battery. Use the remaining-capacity and estimated-range outputs to compare scenarios, plan an inspection, or understand how operating conditions can influence long-term battery health.
Base loss % = age × annual fade + (miles ÷ 25,000) × mileage fade
Adjusted loss % = base loss × [1 + 0.15 × heat share + 0.10 × fast-charge share]
The main result is estimated capacity loss. Remaining capacity and range scale the original figures by the estimated capacity retained.
This scenario model is not a diagnostic result or warranty determination. Manufacturer battery-management buffers can also affect displayed capacity.
For a 75 kWh, 300-mile battery aged 5 years with 60,000 miles, 1.5% annual fade, 1% per 25,000 miles, 20% heat exposure, and 25% fast charging, the base loss is 9.9%. The stress-adjusted estimate is 10.44%, leaving about 67.17 kWh and 268.69 miles.
Yes. This model adds calendar-related fade and mileage-related fade because both time and use can affect an EV battery.
The calculator applies a modest user-visible stress adjustment to the base estimate as the fast-charging share increases.
Yes. Enter an approximate share of the battery’s life spent in persistently hot operating or parking conditions.
No. It is a planning estimate and cannot replace vehicle diagnostics or a measured usable-capacity test.
Speed, weather, elevation, tires, HVAC use, payload, and battery temperature can all change real-world range.
| Variable | Role |
|---|---|
| Calendar fade | Annual capacity-loss assumption |
| Mileage fade | Loss per 25,000 miles |
| Heat share | Raises base loss by up to 15% |
| Fast-charge share | Raises base loss by up to 10% |