Native tool · INT.04 Drive · runs on this page
Charging Cost per 100 km
The number the forums compute by hand: what a hundred kilometres cost on your tariffs, with the off-peak share, the public-charger share and the losses all counted. Every price is yours; nothing is baked in.
Cost per 100 km · v1.0
Consumption × losses × blended tariffHome charging
Public charging
Losses, mileage, comparison
Blended: 20 % public, the rest at home
cost per 100 km = consumption × (1 + losses) × [ (1 − public share) × home blend + public share × public price ], where home blend = peak × (1 − off-peak share) + off-peak × off-peak share. Standing charges, subscriptions and idle fees are excluded and said so here.
Why the blend is the only honest number
Nobody charges at one price. An owner with a night tariff and a wallbox does most charging cheap, some at the day rate when the plan slips, and a slice on the motorway at three or four times the price. Quote any one of those and you are arguing, not calculating. The tool weights them by the shares you enter and prints each line beside the blend, so the argument is at least about the right figure.
Losses belong in the price. A car that shows 18 kWh/100 km on its display draws more than that from the wall; the onboard charger, the cable and the car's electronics take their cut before the battery sees a watt. Ten percent is the model default for home AC. It is editable because measured wallboxes disagree by a few points, and because DC-heavy drivers lose less on their side of the plug.
Reading the petrol-equivalent price
The comparison line asks a single question: how cheap would petrol have to be for the car you name to match your EV per 100 km? A blended 5.23 per 100 km against a 6.5 l/100 km car gives 0.80 per litre. Pump prices above that favour the EV on energy alone. It deliberately ignores purchase price, tax, insurance and depreciation; the EV vs ICE Breakeven tool takes this number and adds all of those.
| 18 kWh/100 km, 10 % losses | Price per kWh | Per 100 km | Per mile |
|---|---|---|---|
| Home off-peak | 0.15 | 2.97 | 0.048 |
| Home peak | 0.30 | 5.94 | 0.096 |
| Public rapid | 0.60 | 11.88 | 0.191 |
| Petrol car, 6.5 l/100 km at 1.75 | — | 11.38 | 0.183 |
FAQ
Divide 62.137 by the miles-per-kWh figure. 3.5 mi/kWh is 17.75 kWh/100 km; 4 mi/kWh is 15.5. The tool switches units for you and shows the cost per mile as well.
Because the meter counts what leaves the wall, not what reaches the battery. With 10 % losses, a car that uses 18 kWh per 100 km draws 19.8 kWh from the grid for those 100 km, and that is what you pay for.
The fuel price at which the petrol car you enter would cost the same per 100 km as your blended EV cost. If the tool says 0.80 per litre and the pump says 1.75, the EV is cheaper to run by that margin. Standing charges, tax and depreciation are left to the EV vs ICE tool.