EV Charging Cost Calculator
Estimate how much an electric-car charging session costs at home or at a public charger, including charging losses.
Currency selection changes the unit label, not an exchange rate. Enter every price in the selected currency.
How to choose the inputs
Use the battery capacity accessible to the driver, not a pack label whose usable capacity is unknown. Enter driving consumption measured at the battery: this tool adds charging losses once. Use the final variable price per kWh from your contract.
Formula and measurement boundary
Three worked scenarios
These are fixed hypothetical examples, not live tariffs or verified product data. They use EUR and kilometres where applicable and do not change with the form settings. Only the table input changes.
Unchanged inputs
- Usable battery capacity: 60 kWh
- Start charge: 20 %
- Target charge: 80 %
- Charging efficiency: 90 %
- Energy consumption: 20 kWh/100 km
| Electricity price | Estimated result |
|---|---|
| 0.15 EUR/kWh | €6.00 |
| 0.25 EUR/kWh | €10.00 |
| 0.5 EUR/kWh | €20.00 |
The same session stores 36 kWh and draws 40 kWh in all three examples. Only the tariff changes. If your measured consumption already includes charging losses, do not apply those losses again.
What this result does not establish
- Session, parking and subscription fees are excluded.
- Efficiency is a user assumption, not a measured property of the selected vehicle.
- Added range assumes constant driving consumption; it is not a range guarantee.
Compare the meter with the battery, not with the dashboard range
The following are additional hypothetical decision examples. Separately discussed fees, reserve allowances or running costs are not automatically added to the form result.
A charging receipt measures electricity at a billing boundary; the battery percentage measures a different boundary. Suppose a 60 kWh usable pack rises from 20% to 80%. The model stores 36 kWh. A dedicated charger meter recording 42 kWh would imply 36 ÷ 42 = 85.7% session efficiency, not a 6 kWh error in the receipt. Percentage readings are rounded and usable capacity is uncertain, so this is an estimate rather than a laboratory efficiency test.
For that session at €0.25/kWh, the energy charge is €10.50. A €1.50 session fee makes the receipt €12.00. The calculator excludes that fee: add it separately. For short top-ups, dividing the fee by the purchased kWh helps reveal why a cheap headline tariff can produce an expensive session.
Record start and finish percentages, metered kWh, the exact tariff and all fees. Use several comparable sessions; include preheating only if it belongs in the cost you want to compare. If your consumption was calculated from wall-meter kWh divided by distance, it already includes charging losses. Enter 100% efficiency for that per-distance comparison instead of adding the same losses twice.
Sources and their scope
- EIA: measuring electricity — Power and energy units only; not equipment performance.
These reference pages were accessed on 21 September 2026. The equations and examples are the site’s own model; these sources do not certify its defaults or results.
Frequently asked questions
Does the cost per 100 km include losses?
Yes, through the entered efficiency. The session and per-distance results use the same tariff.
Are the default prices current market prices?
No. Defaults and the examples below are illustrative inputs, not live prices.
Read the model and verification limits