EV Range Calculator
This EV range calculator estimates the driving distance available from an electric vehicle based on usable battery capacity, energy consumption rate (miles per kWh), and current state of charge. It also applies a temperature adjustment factor based on Department of Energy and AAA research showing that cold and hot temperatures significantly reduce range compared to the EPA-rated figure measured at ideal conditions. Understanding real-world range is essential for trip planning and charging stop decisions.
EV range formula
Available Energy (kWh) = Usable Capacity * SoC% / 100 Range (miles) = Available Energy * mi/kWh * Temperature Factor
Temperature factors from DOE/AAA research: 20 F = 0.59, 32 F = 0.80, 50 F = 0.92, 70 F = 1.00, 95 F = 0.83. Set the factor to 1.00 for ideal conditions (EPA-rated range estimate).
Maximizing EV range
- Pre-condition the cabin while still plugged in so the HVAC does not drain the battery during the drive.
- Use regenerative braking: coast to slow down rather than using friction brakes to recover energy.
- Keep to legal highway speed limits: aerodynamic drag at 75 mph is dramatically higher than at 60 mph.
- Park in a garage in winter: a warmer starting battery has more available capacity and charges faster.
- Reduce cargo weight: every 200 lb reduces range by approximately 1-3% depending on the vehicle.
Frequently asked questions
How does temperature affect EV range?
Cold temperatures reduce lithium-ion battery capacity and increase internal resistance. At 20 degrees F (-7 C), EV range is reduced by about 41% according to AAA research. At 95 degrees F (35 C), range reduces by about 17% due to HVAC cooling load. Optimal range occurs at around 70-75 degrees F.
What is energy consumption (miles per kWh)?
Miles per kWh (mi/kWh) is the EV equivalent of MPG. A typical compact EV achieves 3.5-4.5 mi/kWh. SUVs and trucks achieve 2.0-3.0 mi/kWh. The EPA rates EVs in MPGe for comparability with gasoline vehicles.
What is usable battery capacity?
EV manufacturers reserve a buffer at the top and bottom of the battery to extend battery longevity. Usable capacity is always less than total capacity. For example, a vehicle with a 82 kWh total battery may have only 75 kWh usable.
How much range is lost at highway speed?
Aerodynamic drag increases with the square of speed. Driving at 75 mph instead of 60 mph increases energy consumption by roughly 25-35%, directly reducing range by the same proportion. Most EV range ratings are tested at a blended city/highway cycle.
How do I find my actual miles per kWh?
Most EVs display this in the instrument cluster or companion app. Divide miles driven between charges by kWh consumed (visible on the charging session summary from your EVSE or vehicle app). Use a rolling 50-100 mile average for accuracy.
Official sources
- US DOE Alternative Fuels Data Center: afdc.energy.gov - EV range and efficiency data.
- US DOE Fuel Economy: fueleconomy.gov - official EV efficiency ratings.
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.