EV Range and Charging Time Calculator
Estimate how far your electric vehicle can travel on a full charge and how long it will take to charge from a given state of charge to your target level.
Battery & Vehicle
Charging
Formulas Used
Full-Charge Range
Range = Usable Capacity (kWh) × Efficiency (dist / kWh)
Range at Current SOC
Range_now = Usable Capacity × (SOC_start / 100) × Efficiency
Energy Required from Grid
ΔEnergy_battery = Usable Capacity × (SOC_target − SOC_start) / 100 Energy_grid = ΔEnergy_battery / (Charger Efficiency / 100)
Charging Time
Time (hours) = Energy_grid (kWh) / Charger Power (kW) Time (minutes) = Time (hours) × 60
Range Added
Range_added = ΔEnergy_battery × Efficiency
Assumptions & References
- Efficiency (miles/kWh or km/kWh) is assumed constant; real-world efficiency varies with speed, temperature, HVAC use, and driving style.
- Charger efficiency accounts for AC→DC conversion losses (typically 85–95% for Level 2 chargers; DC fast chargers are closer to 95–98%).
- The model assumes a constant charge rate up to the target SOC. In practice, most EVs taper the charge rate above ~80% SOC to protect battery health.
- Usable capacity is the net capacity available to the driver (gross capacity minus the buffer reserved by the BMS).
- Typical Level 1 charger: 1.4–1.9 kW; Level 2: 3.3–22 kW; DC Fast Charger: 50–350 kW.
- References: SAE J1772 charging standards; U.S. DOE Alternative Fuels Data Center (afdc.energy.gov); EPA EV efficiency ratings (fueleconomy.gov).