EV Cold Weather Range Calculator (Winter Range Loss)
Estimate how much range an electric car loses in cold (or hot) weather from the outside temperature, average speed and heat pump or resistive heater — winter range, kWh/100 km and a range-by-temperature table.
How it works
mild-weather use (kWh/100 km) = battery ÷ range × 100 · cold battery and drivetrain: + 0.5% per °C below 20 °C · heat needed ≈ 0.12 kW per °C below 20 °C (max 7 kW); heat pump divides it by a COP of 3 at 7 °C falling to 1.5 at −8 °C and below; A/C above 22 °C ≈ 0.08 kW per °C · heating kWh/100 km = kW ÷ speed × 100 · range = battery ÷ total use × 100
Cold hurts EV range in two ways: a cold battery and thicker lubricants waste more energy, and heating the cabin takes power that would otherwise move the car. Heating is a fixed power draw, so it costs the most range on slow, short winter trips and the least at highway speed. This model is calibrated to AAA's 2019 tests (about 12% loss at −7 °C with the heater off and around 40% with it on) and to fleet data showing heat-pump cars lose noticeably less. Preheating while plugged in, seat and steering-wheel heaters and a garage all reduce the loss.
Worked example
An EV with 400 km of mild-weather range and a 75 kWh battery uses 18.75 kWh/100 km. At −10 °C and 50 km/h average with a heat pump, the cold drivetrain adds 15% (21.6 kWh/100 km) and the heat pump draws about 2.4 kW, another 4.8 kWh/100 km. Total use is 26.4 kWh/100 km, so the range is 75 ÷ 26.4 × 100 = 284 km — 29% less than in mild weather.
Sources: AAA — Cold weather reduces electric vehicle range (2019 research) · US DOE fueleconomy.gov — Fuel economy in cold weather (electric vehicles)
Frequently asked questions
How much range does an EV lose in winter?
Typically 20–30% in freezing weather with a heat pump and 30–40% or more with a resistive heater on short, slow trips. AAA measured a 41% average loss at −7 °C (20 °F) with the heater running in city driving.
Does a heat pump really help?
Yes. A heat pump moves heat from outside air and delivers 1.5–3 kWh of heat per kWh of electricity, so it uses about half the energy of a resistive heater in moderate cold. Below about −15 °C its advantage shrinks.
How can I reduce winter range loss?
Precondition the cabin and battery while plugged in, use seat and steering-wheel heaters with a lower cabin temperature, park in a garage, keep tyres at the right pressure and drive a little slower on the highway.
Does heat also reduce EV range?
Less than cold. Air conditioning at 35 °C (95 °F) cuts range by roughly 10–20% in city driving, mostly from the A/C compressor.
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This calculator is for educational purposes. Double-check important results before acting on them.