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EV Range Calculator

Enter your battery capacity, efficiency, and usable percentage to estimate your EV's range.

How it is calculated

The tool first works out how much energy you can really draw, then converts it to distance: usable kWh = battery × usable% ÷ 100, range (mi) = usable kWh × efficiency and range (km) = range (mi) × 1.60934. Battery is the pack capacity in kWh, efficiency is in miles per kWh (higher is better, so the wrong way round from kWh per 100 km), and usable% is the share of the pack you plan to use. If efficiency is empty the tool assumes 3.5 mi/kWh and if usable% is empty it assumes 90. Miles and kilometres are rounded to whole numbers, and usable energy to two decimals. Values are not capped, so a usable% above 100 is calculated as typed.

Worked example

A car has a 60 kWh battery, gets 3.8 mi/kWh and you plan to use 85 % of the pack. Usable energy: 60 × 85 ÷ 100 = 51.00 kWh. Range: 51 × 3.8 = 193.8, shown as 194 mi. In kilometres: 193.8 × 1.60934 = 311.9, shown as 312 km. If efficiency dropped to 3.0 mi/kWh in cold weather, the same 51 kWh would give about 153 mi.

Try this example →

Common mistakes

  • Typing efficiency as kWh per 100 km or Wh/km (for example 17 or 170); the field wants miles per kWh, so convert first or the range comes out absurdly large or small.
  • Entering the efficiency in km per kWh: the result is then treated as miles and converted again, overstating the kilometres by about 60 %.
  • Using the manufacturer's gross battery capacity and also a high usable percentage; check whether the number quoted is gross or net and set the usable% accordingly.
  • Treating the answer as guaranteed: efficiency changes with speed, temperature, load and hills, so use the efficiency you actually see on the trip, not the best case.
  • Entering the usable share as a fraction (0.85) instead of a percent (85), which gives a tiny range.

About this calculator

An electric vehicle's driving range depends on three things: how much energy the battery actually holds, how efficiently the car uses that energy per mile or kilometer, and how much of the rated battery capacity is realistically usable (automakers reserve a buffer at both ends to protect battery health, so 100% of the pack rarely means 100% usable).

This calculator multiplies battery capacity by the usable-percentage buffer, then multiplies by the car's efficiency in miles per kWh (3.5 if left blank) to estimate real-world range, shown in both miles and kilometers. EV shoppers comparing models and current owners planning a road trip use it to get a more realistic number than the optimistic figure on a window sticker, since real efficiency varies with speed, terrain, and climate control use.

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Comments (1)

  • Editorial team

    The usable percentage works as a trip-planning setting, not only a battery property. If you leave a charger at 80% and want to arrive at the next one with 10% left, enter 70. With a 75 kWh pack at 3.5 mi/kWh that gives 183.75 miles, shown as 184 mi, or 296 km. Run it a second time with your highway efficiency to see the gap. Which efficiency figure do you actually get on long drives?

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