Use comparable units
The "100 distance units" can be 100 km or 100 miles, as long as the vehicle consumption and trip distance use the same distance system.
Example
At 18 kWh per 100 km, $0.20 per kWh, 300 km and 90% charging efficiency, grid energy is about 60 kWh and trip cost is about $12.
Common mistakes
Do not mix miles with kWh per 100 km, or home electricity prices with public fast-charging prices unless that is the scenario you want.
What the result includes
The estimate includes charging efficiency so the electricity bought from the grid can be higher than the energy shown as vehicle consumption. It does not include parking fees, charger session fees, battery preconditioning or route-specific terrain and temperature effects.
Last reviewed: 2026-05-17