Electric Vehicle Range Calculator

The range of a battery electric vehicle is the product of two quantities: the energy actually available in the pack, in kilowatt-hours, and the consumption rate of the vehicle, in miles per kilowatt-hour. A 75 kWh pack at 90 percent state of charge holds 67.5 kWh, and at 3.5 mi/kWh that is roughly 236 miles under ideal conditions. Real driving departs from the ideal in three ways this model captures. Aerodynamic drag rises with the square of road speed, so the power needed to overcome it rises with the cube of speed, which is why efficiency falls steadily above about 55 mph. Cold weather raises the internal resistance of lithium-ion cells and reduces the charge they will release, and cabin heating pulls 1 to 5 kW directly from the pack because there is no waste engine heat to borrow. Typical modern EVs are rated between 2.5 and 4.5 mi/kWh, with small aerodynamic sedans at the top of that band and full-size electric pickups near the bottom. AAA test work published in 2019 measured roughly 41 percent combined range loss at 20 degrees F with the cabin heater running, and about 17 percent at that temperature with heating off. The limitations of this estimate are worth stating plainly: it applies fixed multipliers rather than a physical drag model, and it ignores elevation change, headwind, payload, tire rolling resistance, regenerative braking recovery in stop-and-go traffic, and pack degradation, which typically runs 1 to 2 percent of capacity per year.

Standardized electric range testing in the United States grew out of the fuel economy program created by the Energy Policy and Conservation Act of 1975. The Society of Automotive Engineers issued SAE J1634, the Battery Electric Vehicle Energy Consumption and Range Test Procedure, in the early 1990s, and the EPA adapted it as electric models reached showrooms. General Motors built the EV1 in 1996 with a lead-acid pack good for roughly 70 to 100 miles, and the 2008 Tesla Roadster was the first highway-capable lithium-ion production car, EPA-rated at 244 miles. The miles-per-kilowatt-hour and MPGe figures on window stickers date to 2010, when the EPA and the Department of Transportation issued a revised fuel economy label rule ahead of the Nissan Leaf and Chevrolet Volt. MPGe uses the equivalence of 33.7 kilowatt-hours to one gallon of gasoline, based on the lower heating value of gasoline. Europe followed a different path: the New European Driving Cycle produced range claims widely criticized as optimistic, and it was replaced by the Worldwide Harmonised Light Vehicles Test Procedure between 2017 and 2018. Temperature-corrected range guidance became common only after cold-climate owners and independent testers such as AAA and the Norwegian Automobile Federation documented winter losses that the official cycles did not represent.