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EV charging cost calculator

Work out what a full charge, and every trip, actually costs an electric car.

Input
90
Output
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EV charging cost calculator
Paste a list of trips and this tool prices each one on electricity, using your car's real consumption and charging losses — then shows the total cost of a charging session and, if you want it, what the same trips would have cost in a petrol or diesel car.
Set the battery capacity in kWh and consumption in kWh per 100 km from your car's spec sheet, and a charging efficiency around 90% to account for the energy lost as heat between the wall socket and the battery — a real number, not the battery's nameplate capacity, is what actually gets paid for. Choose the electricity price for home or public-station charging, and the charge range you plan to use, such as the common 20% to 80% that keeps most batteries in their healthiest zone. To compare against a combustion car, turn on the petrol or diesel comparison and enter its consumption in litres per 100 km and the local fuel price; the tool then shows the saving, or the extra cost, trip by trip and in total.
Trips go one per line, either "label;distance" — for example "Commute;40" — or a bare distance in kilometres when a label isn't needed. Lines that don't parse are skipped and counted rather than silently dropped, so a stray note in the list never breaks the calculation. The live tally under the output tracks the number of trips, the total cost and the cost per 100 km as you type.
Everything runs on your device: your trips, prices and battery details are never uploaded anywhere. Copy the breakdown, download it as a .txt file, or send it straight into another tool to keep working with the numbers.
FAQ
Why does the tool ask for charging efficiency, not just battery capacity?
A charger loses some energy as heat before it reaches the battery, typically around 10%. Pricing the electricity actually drawn from the wall, not the battery capacity alone, gives a realistic cost.
What does the charge range option mean?
It sets the start and end percentage of the charging session, such as 20% to 80%. Only that span of the battery is priced, which matches how most EV owners actually charge day to day.
Can I compare against a diesel car instead of petrol?
Yes. Set "Compare with" to diesel car and enter its consumption in litres per 100 km and the local diesel price; the comparison switches automatically.
What format should the trip list use?
One trip per line, either "label;distance" (for example "Commute;40") or a plain distance in kilometres. Lines that don't match either form are skipped and counted, not silently ignored.
Is my trip and price data uploaded anywhere?
No. The calculation runs entirely in your browser using JavaScript — nothing you type is sent to a server.