EV Cost Per Mile Calculator

How it is calculated

The tool needs the car's energy use in kWh per 100 miles and your electricity price per kWh. First it converts consumption to one mile: kWh per mile = kWh per 100 mi ÷ 100. Then cost per mile = kWh per mile × price and cost per 100 miles = cost per mile × 100. Both money values are shown in dollars rounded to the cent. The 100-mile figure is calculated from the unrounded per-mile cost, so it is more precise than 100 times the displayed per-mile value. Both inputs must be above zero. The cost covers electricity only. It uses the energy figure that you enter, so charging losses are included only if your kWh figure measures energy drawn from the wall.

Common mistakes

• Entering miles per kWh instead of kWh per 100 miles. A car that does 3.5 miles per kWh uses about 28.6 kWh per 100 miles, and typing 3.5 would give a cost about eight times too low.
• Typing the price in cents, such as 17 instead of 0.17. The tool takes your number as it is, so the per-mile cost comes out 100 times too high.
• Using the home rate for a public fast charger. Prices differ, so run the tool once for each rate you really pay.
• Multiplying the displayed per-mile cost by the distance. It is rounded to the cent, so use the per-100-mile result for longer trips.
• Using the battery size as the consumption. A 60 kWh battery is capacity, not the energy used per 100 miles.