EV Battery Degradation Calculator — Range Loss Over Time
Calculate how much range your EV battery will lose over 5, 10 and 15 years. Enter battery size and annual mileage to see degradation projections by model.
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How to use this calculator
- Enter your EV battery capacity in kWh (find this in your vehicle spec sheet or owner's manual).
- Enter your current EPA-rated range in miles.
- Adjust annual mileage — higher mileage accelerates degradation due to more charge cycles.
- Select your typical charging pattern (mostly home Level 2, or frequent DC fast charging).
- Year-by-year range projections appear for up to 15 years.
Understanding your results
Battery degradation refers to the gradual loss of a lithium-ion battery’s capacity over time and charge cycles. Most EV manufacturers quote 70% capacity retention after 8 years or 100,000 miles as a warranty threshold.
Degradation rate varies significantly: Tesla Model 3 and Y have shown real-world degradation of 8–12% over 100,000 miles. Nissan Leaf (older air-cooled battery) degrades faster at 20–30% over the same distance. Newer thermal management systems significantly reduce degradation.
DC fast charging frequency matters. Using DC fast chargers daily significantly accelerates degradation compared to overnight Level 2 home charging. Limiting fast charging to occasional road trips is the most effective way to preserve battery health.
State of charge habits also affect longevity. Keeping a battery between 20–80% state of charge for daily use, and only charging to 100% for long trips, can extend battery life by 20–40%.