EV Range and Trip Planner Calculator
Estimate your electric vehicle's range and determine how many charging stops you'll need for a trip based on battery capacity, efficiency, and driving conditions.
Formulas Used
Usable Energy (kWh):
Usable Energy = Battery Capacity × ((SOC_start − SOC_reserve) / 100)
Combined Efficiency Factor:
Combined Factor = Temperature Factor × HVAC Factor × Speed Factor
Adjusted Efficiency (distance/kWh):
Adjusted Efficiency = Rated Efficiency × Combined Factor
Estimated Range:
Range = Usable Energy × Adjusted Efficiency
Energy Consumption per Unit Distance:
kWh/unit = 1 / Adjusted Efficiency
Charging Stops (Trip Planner):
If Trip Distance > Range:
Remaining = Trip Distance − Range
Charge Range = Battery × ((80% − Reserve%) / 100) × Adjusted Efficiency
Stops = ⌈Remaining / Charge Range⌉
Assumptions & References
- Rated efficiency is the manufacturer's stated or real-world measured value under ideal conditions.
- Temperature efficiency losses are based on studies by AAA and Recurrent Auto: cold weather (0°C/32°F) reduces range by ~20%, very cold (below 0°C) by ~35%, warm weather has a minor ~5% reduction.
- HVAC (heating/cooling) draws 1–5 kW continuously, reducing effective range by 5–20% depending on intensity (U.S. DOE data).
- Highway speed factors reflect aerodynamic drag: energy consumption increases roughly with the square of speed. At 75 mph vs. 55 mph, range drops ~25% (EPA/NREL research).
- En-route charging stops assume DC fast charging to 80% SOC (standard recommendation to preserve battery health and maximize charge speed).
- Reserve SOC (default 10%) protects battery longevity and provides a safety buffer against unexpected range loss.
- Factors are multiplicative and independent; real-world interactions may vary slightly.
- References: U.S. DOE Alternative Fuels Data Center, EPA EV Range Testing, AAA Electric Vehicle Range Testing (2019–2023), Recurrent Auto Range Report (2022).