EV Charging Cost Calculator
The EV Charging Cost Calculator estimates the cost of charging your electric vehicle's battery based on its capacity, your electricity price, and typical charging losses.
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How This Tool Works
Enter your EV's battery capacity, your electricity price per kWh, and your starting and target charge percentages to estimate the cost of a charge.
Formula & Method
Energy added = battery capacity × (charge-to % − charge-from %) ÷ 100. Energy drawn from the outlet = energy added ÷ (1 − charging loss %). Cost = energy drawn × price per kWh.
Example Calculation
Charging a 75 kWh battery from 20% to 90% at $0.15/kWh with 10% charging losses costs about $8.75.
Frequently Asked Questions
Why is there a "charging loss" percentage?+
Not all electricity drawn from the wall makes it into the battery — some is lost as heat during the AC-to-DC conversion process, typically 8–15% depending on charger type.
Does DC fast charging cost more?+
Public DC fast chargers often charge a premium price per kWh compared to home charging, and may have slightly higher losses — check your charging network's rates.
How does this compare to gas costs?+
Use our Gas vs. EV Cost Calculator to directly compare your per-mile costs between a gas vehicle and an EV.
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