⚡ EV Charging Cost Calculator

+15% losses
Charge Percentage
70%
10% → 80%
Energy Required
52.50 kWh
(75 kWh × 0.70)
Price (No Losses)
393.75 CZK
52.50 kWh × 7.5 CZK
💰 Final Price (with Efficiency)
452.81 CZK
393.75 CZK × 1.15
ℹ️ Tip:
Charger efficiency typically ranges from 10–20% losses. A value of 15% is a good average for standard chargers.
Vehicle data from gaia-charge/evdb, licensed under CC BY-SA 4.0. Battery capacities are usable kWh; verify for your specific trim.

How EV charging costs are calculated

Working out what it costs to charge an electric vehicle comes down to three numbers: how big the battery is, how much of it you want to refill, and what you pay for a kilowatt-hour of electricity. Multiply them together and you have the cost of the energy that goes into the car.

The formula is straightforward: cost = battery capacity (kWh) × charge added (%) × price per kWh. If you charge a 75 kWh battery from 10% to 80%, you add 70% of its capacity, which is 52.5 kWh. At a price of 7.50 per kWh that comes to roughly 394 in your local currency, before charging losses are taken into account.

Why charging losses matter

Not all the electricity you pay for reaches the battery. Some is lost as heat in the cables, the on-board charger and the battery itself. These losses are usually between 10% and 20%, and tend to be higher when charging slowly at home or in cold conditions. That is why the number on your electricity bill is often higher than a naive calculation suggests. This calculator includes an efficiency setting so you can add a realistic loss factor and see the true cost of a charging session.

Home charging versus public charging

The single biggest factor in your charging cost is where you plug in. Charging at home uses your household electricity rate, which is typically the cheapest option available. Public fast chargers trade a higher price per kWh for much faster charging speeds, which is convenient on long journeys but more expensive per kilometre. Because the calculator lets you set any price per kWh and pick from a wide range of currencies, you can compare home and public charging side by side, or work out the cost of a trip across different countries.

Frequently asked questions

Multiply the energy you add to the battery by the price per kWh. The energy added is your battery capacity multiplied by the charge percentage you gain. For example, adding 70% to a 75 kWh battery means 52.5 kWh; at 7.50 CZK per kWh that is roughly 394 CZK before charging losses.