Method
How to calculate estimated charging cost
The battery energy added is increased for charging losses, then multiplied by the entered tariff.
FORMULAGrid energy = battery capacity × charge added ÷ charging efficiency
Worked example
EV charging-cost calculator example
Adding 60% to a 75 kWh battery stores 45 kWh; at 90% efficiency the grid supplies about 50 kWh.
Change one assumption at a time to see what drives the result. The output is an estimate, not a quote, forecast or recommendation.
FAQ
EV charging-cost calculator FAQ
Why include charging efficiency?
Some grid energy becomes heat or powers charging systems instead of reaching the battery.
Should I use home or public tariff?
Use the rate for the charging session being modeled, including time-of-use pricing where relevant.
Does this include charger membership fees?
No. Add session, parking or subscription fees separately.