EV Charging Cost Calculator

Calculate how much it costs to charge an electric car by battery percentage or kWh, compare charging scenarios and estimate weekly, monthly and yearly cost.

Electric vehicle charging cost

Calculate how much each charging session costs

This calculator estimates the cost of a specific charging session, the cost of moving from one battery percentage to another, the cost of charging a chosen number of kWh and how the result changes across common charging scenarios.

1. Choose the calculation mode

Pick whether you want to calculate by battery percentage or by direct energy to charge.

2. Charging scenario

The selector applies a helpful starting price, but the price per kWh always stays editable.

Home0.22 €/kWh
Home off-peak tariff0.14 €/kWh
Public AC charging0.39 €/kWh
Fast DC charging0.59 €/kWh
Custom price0.30 €/kWh

3. Frequency of use

If you leave it at 0 or empty, the calculator still works for a single charging session.

Advanced options

Vehicle type is shown as an informational assumption and does not add extra complexity to the base model.

Ready to calculate

Enter your data and click Calculate to see the estimated charging cost, energy added to the battery, energy drawn from the grid, scenario comparison and recurring cost projection.

How this calculator works

The calculator can estimate a specific charging session in two ways. In battery and percentage mode it starts from total battery capacity and the difference between the current percentage and the target percentage. In energy mode it starts directly from a chosen number of kWh.

It then applies charging losses to estimate the total energy drawn from the grid. That grid energy is multiplied by the selected price per kWh to obtain the main charging cost, and the same grid energy is used to compare the standard charging scenarios.

What affects the cost of charging an electric car

The most important variables are the amount of energy you want to add, the price per kWh and charging losses. Two charging sessions may add the same battery energy but still cost different amounts if the tariff or losses are not the same.

Frequency also matters. A seemingly small charging cost can become a meaningful monthly or yearly expense when you repeat that same session several times a week.

kW vs kWh

kW is power: it tells you how fast energy can be delivered. kWh is energy: it tells you how much energy is actually transferred. This calculator uses kWh and price per kWh because those are the values that determine cost.

How to interpret the result

The main block shows the cost of the selected charging session together with energy added to the battery and energy taken from the grid. If grid energy is noticeably higher, losses are having a relevant effect on the final cost.

The comparison block helps you see whether the same charging session would be cheaper at home or more expensive on fast charging. The frequency section turns a one-off session into a weekly, monthly and yearly estimate.

FAQ about EV charging cost

Can I use this calculator if I only know the battery percentages?

Yes. The battery and percentage mode is designed exactly for that situation, for example to estimate how much it costs to go from 20% to 80% with a given battery.

What if my charger shows the kWh directly?

Then you can use the direct energy mode and enter the kWh you want to estimate without relying on total battery capacity.

Why does the price differ so much between home and fast charging?

Because each scenario usually has a different price per kWh. Fast DC charging is typically more expensive, while home charging and especially off-peak home charging are usually cheaper.

What happens if I leave frequency at 0?

The calculator still works for the one-off charging session. It simply does not project repeated weekly, monthly and yearly cost.

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