EV Range Calculator

It starts from the core relationship range equals usable battery capacity in kWh times efficiency in miles per kWh. So a 75 kWh pack at 3.5 mi/kWh gives an ideal range of about 262 miles. The calculator then scales that down with three factors: a speed factor for aerodynamic drag, a climate factor for heating and cooling, and your usable charge window (starting charge minus the reserve you keep).

Aerodynamic drag rises with the square of speed, so the energy needed to push the car through the air climbs steeply above about 55 mph. A steady 75 mph cruise can use 25 percent more energy per mile than mixed city driving, which is why the calculator applies a lower factor for sustained highway speeds. City and stop-and-go driving is the best case because regenerative braking recovers energy.

A lot. The AAA 2019 study measured roughly a 41 percent range loss at 20 F with the cabin heater running, because heating the cabin draws directly from the battery and a cold pack accepts and delivers energy less efficiently. Hot weather costs less, around 17 percent at 95 F with the air conditioner on. Pick the climate option that matches your conditions to see the effect.

Use your car's rated or observed efficiency. Sedans typically run 3.5 to 4.5 mi/kWh, while trucks and large SUVs drop to 2.0 to 2.5 mi/kWh. If your dashboard or window sticker shows Wh per mile instead, switch the unit selector: 250 Wh/mi equals 4.0 mi/kWh, since 1 kWh is 1000 Wh.

It is the charge you want left when you arrive, so you are not planning to run the pack to zero. If you start at 100 percent and set a 10 percent reserve, the calculator only counts the 90 percent window you actually intend to drive. Keeping a buffer is good practice for finding a charger and for long battery health.

No. It is a planning estimate, not a guarantee. Real range also depends on terrain, elevation gain, payload, towing, tire pressure, wind, and battery age, none of which this tool models directly. Treat the EPA-style ideal range as a ceiling and the adjusted figure as a realistic working number, then leave margin for the unexpected.