Applicable scope: Global; US calculator example; verify your exact vehicle and local requirements.
The price written on a public charging screen is not necessarily the complete cost per kilometre, and the price on a home electricity bill is not a universal cost per kWh. EV running costs depend on energy consumed from the wall, electricity tariff, charging losses, taxes and fees, and how far the driver actually travels. A sound calculation uses measured billing and consumption data for the specific ownership situation rather than a manufacturer’s advertised maximum range.
Build the charging ledger
Start with electricity bought over a consistent period and distance driven over that same period. Use your bills or charging receipts, keeping currency, tariff period, parking or idle fees and any subscription costs separate. Divide all charging-related spending by distance driven for a practical cost per kilometre. If consumption is shown in kWh/100 km, the energy-only calculation is that number multiplied by your effective currency-per-kWh rate, divided by 100. The effective price should include applicable charging charges.
Home and public charging are not interchangeable
The US DOE’s Alternative Fuels Data Center distinguishes home charging equipment and public charging options. Household installation may add up-front electrical work, equipment and permits; public fast charging may carry different per-session or time-based fees. Do not compare a subsidised home tariff with a public price while concealing the difference. Owners without dependable home charging should explicitly model the mix they expect to use.
Record uncertainty
Energy consumed varies with speed, temperature, tires, HVAC, hills, preconditioning and battery condition. Some vehicle displays show energy used by the car, which may not equal energy paid for at the meter. Compare vehicles using the same reporting boundary. For an imported EV, first confirm local charge-port compatibility and support. A single cheap charging stop is not evidence of low annual ownership cost; include insurance, depreciation, tires and servicing separately before claiming EV ownership is economically superior.
Safety and verification
This is ownership information, not a vehicle-specific diagnosis, repair authorization or parts compatibility determination. Confirm the exact model, market, service publication and current local rules. For brakes, steering, structural damage, airbags, high-voltage equipment or other safety-critical concerns, use qualified professionals and follow manufacturer emergency instructions.