EV charging cost calculator
Enter your battery size, the charge level you start and finish at, and your electricity price. The calculator shows what a charge costs, the energy drawn from the socket, and the cost per 100 km — the number to compare against a tank of fuel.
You pay for the energy drawn from the socket, which is more than the energy that reaches the battery because of charging losses.
Cost per 100 km at different electricity prices
Assumes 90% charging efficiency. Find your consumption row and your price column; the figure is what 100 km of driving costs in electricity.
| Consumption | €0.15/kWh | €0.25/kWh | €0.35/kWh | €0.45/kWh |
|---|---|---|---|---|
| 15 kWh/100 km | €2.50 | €4.17 | €5.83 | €7.50 |
| 18 kWh/100 km | €3.00 | €5.00 | €7.00 | €9.00 |
| 22 kWh/100 km | €3.67 | €6.11 | €8.56 | €11.00 |
How this is calculated
Energy from the socket = battery capacity × (target % − start %) ÷ 100 ÷ efficiency. Charging a 60 kWh battery from 20 to 80% puts 36 kWh into the battery, which is 40 kWh drawn from the socket at 90% efficiency.
Cost of the charge = energy from the socket × your price per kWh. 40 kWh at 0.25 per kWh is 10.00.
Cost per 100 km = consumption ÷ efficiency × price. At 18 kWh per 100 km, 90% efficiency and 0.25 per kWh, that is 5.00 per 100 km.
Compare that with fuel: a petrol car using 6.5 litres per 100 km at 1.70 per litre costs about 11.05 for the same distance.
Assumptions and limits
- The calculation uses the electricity price you enter. Public charging can use different tariffs, session fees or time-based charges, so enter the applicable total price when comparing it.
- The default efficiency is an estimate, not a fixed loss rate. Adjust it when you have a measured or vehicle-specific figure.
- Prices are whatever you enter — the tool holds no country price data, so it stays correct wherever you are and whenever tariffs change.
- Currency is shown as euro for display; the arithmetic is identical in any currency.
Frequently asked questions
How much does it cost to charge an electric car at home?
For a 60 kWh battery charged from 20 to 80%, you add 36 kWh to the battery and draw about 40 kWh from the socket at 90% efficiency. At 0.25 per kWh that is about 10.00 for roughly 200 km of range at 18 kWh per 100 km, or around 5 per 100 km.
Is home charging cheaper than public charging?
It depends on your home tariff, the public operator's price and any session or time fees. Compare the total prices that apply to you rather than relying on a general price range.
Why do I pay for more energy than my battery holds?
Some energy is used by charging electronics, battery conditioning and other systems. The share varies. At the calculator's 90% example, adding 36 kWh to the battery requires about 40 kWh from the socket.
Does a cheaper night tariff make a big difference?
It can if your supplier offers one. At 15,000 km a year and 18 kWh per 100 km, the battery uses about 2,700 kWh before charging losses, so use the calculator with your actual day and night prices to compare.
