EV charging cost calculator
Cost to charge from battery size and rate.
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How it's calculated
The energy the battery takes on is its size times the share of it you are adding: 60% of a 75 kWh pack is 45 kWh. Charging is not perfectly efficient, so divide by one minus the loss to get what the meter actually counts, about 50 kWh at a 10% loss. Multiply by your rate for the cost. A full charge from empty divided by the range gives the cost of each mile, which is how an EV compares with a petrol car.
How much does it cost to charge an EV at home?
At the US average of about 17¢ per kWh, a 75 kWh battery costs roughly $14 to fill from empty with typical losses, and a 20–80% top-up about $8.50. On an off-peak EV tariff of 10¢ the full charge is nearer $8. That is 3–5¢ a mile against 10–15¢ for petrol.
Why does charging use more electricity than the battery holds?
Converting AC from the wall to DC in the battery, running the battery cooling and the car's electronics while charging all take energy. Expect 10–15% extra on a Level 2 home charger and up to 20% on a slow 120 V outlet, where the overhead runs for many more hours.
Is public fast charging more expensive?
Usually three to four times home rates: 40–60¢ per kWh, sometimes billed by the minute. Enter that rate and a 5–10% loss to see a fast-charge cost. Most owners do the bulk of their charging at home and use fast chargers only on trips.
Results are estimates for informational purposes only and are not financial, medical or legal advice.