EV charging cost calculator

How this is calculated

Energy added is the battery capacity times the share of the battery you fill, which is the end percentage minus the start percentage. The cost of a session is that energy times your price per kWh. If you enter miles per kWh, range added is the energy times that figure and cost per mile is the price divided by it. The monthly cost is the session cost times the number of sessions.

session cost = capacity × (end % − start %) ÷ 100 × price per kWh

The method, the constants and the limits are written out in how fuel cost is calculated.

Home charging and public charging

Home charging is billed at your electricity rate, which may change with the time of day if your plan works that way. Public chargers set their own prices, and some charge by the kWh while others charge by the minute or add a session fee. Because there is no single price to assume, this page does not preset one. Type the figure that applies to the charge you are planning.

Energy from the wall and energy in the battery

Some energy is lost as heat between the outlet and the battery, so the energy you are billed for can be a little higher than the energy that ends up stored. This calculator does not add a loss factor, because the right figure depends on the car and the charger. If you know your billed kWh for a typical charge, you can enter an electricity price that already reflects it, or compare the result with what your bill shows.

For the efficiency figure of a specific model, fueleconomy.gov lists energy use for electric vehicles: see fueleconomy.gov, which gives it in kWh per 100 miles. Divide 100 by that number to get miles per kWh. To compare running costs against a gas car, use the EV vs gas cost calculator. For the all-in cost of any car per mile, try the cost per mile calculator. Petrol and diesel trips are on the fuel cost calculator.