EV Range Calculator
Created by: Emma Collins. Last updated:
Estimate EV distance from current usable capacity, battery-side consumption, starting charge and arrival reserve.
Estimate distance to an arrival reserve
This calculator uses current usable battery capacity and battery-side energy consumption. It estimates distance under the consumption assumption you enter; it does not predict weather or traffic.
Formula
Driving energy = usable capacity × (starting charge − arrival reserve) / 100. Range = driving energy / battery energy consumed per mile.
Example
A 75 kWh usable battery, 100% starting charge and 10% reserve provide 67.5 kWh for driving. At 300 Wh/mile, the estimate is 225 miles (362.10 km).
Choosing inputs
Gross pack capacity includes energy unavailable to the driver. Use current usable capacity, including any degradation already reflected in that value. Use observed consumption for comparable speed, weather, terrain and HVAC use. Electricity-label data includes charging losses and is not directly equivalent to battery-side consumption.
Changing units preserves the physical consumption value. The reserve is user selected; no universal safety margin guarantees reaching a charger.
Sources and measurement guidance
- EPA Automotive Trends Report, Appendix E: electricity consumption at the wall includes charging losses.
- EPA eGRID summary data: regional electricity emissions factors. Match the reporting year and CO2 or CO2e measure.
- US Department of Energy: electric vehicle charging.