EV Charging Cost Calculator
Work out what it costs to charge an electric car, how long it takes and how much range you get, including charging losses.
An estimate. Real charging losses depend on the charger, the temperature and battery heating, and fast charging slows down as the battery fills — usually above about 80 %.
About this tool
Enter the usable battery capacity, the charge level you start at and the level you want, your electricity price, the charging power and your car’s consumption. The calculator finds the energy that goes into the battery, the extra energy drawn from the grid because of charging losses, the cost, an approximate charging time and the range you add — plus the cost per 100 km.
Frequently asked questions
Energy into the battery = battery capacity × (target % − start %). Divide by (1 − charging loss) to get the energy from the grid, then multiply by your price per kWh. Example: a 75 kWh battery from 20 % to 80 % takes 45 kWh; with 10 % loss that is 50 kWh from the grid, which costs 15.00 at 0.30 per kWh.
Some energy is lost as heat in the charger, cable and battery. In tests by the German motoring club ADAC, losses were about 5–7 % on an 11 kW wallbox but 12.7–24.2 % on a household socket with a portable charger. Cold weather and battery heating can add more.
Roughly the energy from the grid divided by the charging power. 50 kWh at 11 kW takes about 4 h 33 min. The usable power is the lowest of the charger, the car’s on-board charger and your fuse — a car with a 7.4 kW on-board charger charges at 7.4 kW even on an 11 kW wallbox. Fast chargers slow down as the battery fills.
Cost per 100 km = consumption (kWh/100 km) ÷ (1 − loss) × price. At 18 kWh/100 km, 10 % loss and 0.30 per kWh: 18 ÷ 0.9 × 0.30 = 6.00 per 100 km. Your car’s trip computer shows your real consumption, which is usually higher in winter and at motorway speeds.
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