EV Charging Cost Calculator
Estimate the grid energy and electricity cost required to add a chosen amount of energy to an EV battery.
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How this calculator works
Grid energy = battery energy added ÷ charging efficiency. Cost = grid energy × electricity rate + session fee.
Worked example
Adding 50 kWh at 90% efficiency requires about 55.56 kWh from the grid and costs about $8.89 at $0.16/kWh.
Sources & assumptions
Grid energy is battery energy divided by charging efficiency. The U.S. Department of Energy notes that charging involves energy loss; actual efficiency varies by charger, vehicle, temperature, and battery conditioning. See DOE charging-loss data.
Frequently asked questions
Why is grid energy higher than battery energy?
Charging loses some energy as heat and through power conversion, battery conditioning, and vehicle systems.
Where do I find my electricity rate?
Use the energy charge from your utility bill and account for time-of-use pricing or public-charger fees when applicable.