EV Range Calculators

EPA range vs real-world range

The EPA range number on a window sticker comes from a standardized test cycle that mixes city and highway driving at moderate speeds in mild weather. Real-world range almost always differs. Lots of city stop-and-go can actually beat EPA (regenerative braking recovers energy). Pure highway driving, especially at 75+ mph, falls well short — the calculator output won't survive contact with a long interstate trip without an adjustment.

The biggest range killers

• Speed. Aerodynamic drag rises with the square of speed. 75 mph uses roughly 50% more energy per mile than 55 mph.
• Temperature. Below freezing, lithium-ion batteries become physically less efficient and the cabin heater draws steady kilowatts.
• Terrain. Climbing hills drains the battery fast; descending recovers some of it back via regen.
• Wind. A 10 mph headwind can cost 5–10% range; a tailwind gives it back.
• Tire pressure. Underinflated tires can cost 3–5% efficiency on their own.

Range loss over the life of the battery

EV batteries lose some capacity over time, from two sources: calendar aging (sitting around) and cycle aging (charging and discharging). Industry-wide averages suggest about 2% per year for the first few years, slowing afterward. Most modern EVs retain 85–90% capacity at 8 years and 100,000 miles. The EV Battery Degradation Estimator gives a rough projection. Manufacturer warranties typically guarantee at least 70% capacity for 8 years or 100,000 miles.

Planning a long trip

For everyday driving, range rarely matters — most EVs cover a week of commuting on a single charge. Long trips are different. Plan around charging from roughly 10% to 80% (the fast part of the charging curve), assume highway-speed range rather than EPA, and use the Road Trip Charging Stops Calculator to estimate how many stops you'll need. For actual route planning with real charger locations and charging speeds, route planners like A Better Route Planner are excellent.