METHOD
Formula and method
Grid energy = capacity × charge change / efficiency.
Electric car charging cost, grid energy and time
Estimate grid energy, charging cost and charging time.
01
Your inputs
Starting values are an example. Replace them with your own.
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02
Your result
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About this result
Informational calculations. Check assumptions, dates and jurisdiction before making a decision.
Full disclaimerHow much electricity does an EV charge use?
The calculator multiplies usable battery capacity by the change in charge level and divides by charging efficiency to get the energy drawn from the grid. Charging a 60 kWh battery from 20% to 80% at 90% efficiency takes 40 kWh, which at 0.30 KM per kWh costs 12 KM and takes about 5.6 hours at 7.2 kW. Add any session fee yourself, and allow for slower charging at high charge levels in the average power you enter.
TRACEABLE
Sources and validity
Basic arithmetic or geometry using the formula shown. Uses only your inputs.
How we maintain data