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. Because the charging-loss percentage is applied by dividing rather than subtracting — energy drawn from the outlet = energy added ÷ (1 − loss%) — its effect on cost is larger than the percentage itself suggests: a 15% loss rate actually adds about 17.6% to the energy you pay for, not 15%. If you leave the starting or target charge fields blank, the calculator doesn't show an error; it silently assumes a full 0%-to-100% charge, so it's worth double-checking those two fields reflect your actual charge window. The formula also treats every kWh added as costing the same regardless of charge level, even though real charging — especially DC fast charging — slows well below its rated speed above roughly 80% state of charge; that only affects charging time, not this cost estimate.
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 60 kWh battery from 10% to 80% at $0.13/kWh with 12% charging losses: energy added to the battery = 60 × (80 − 10) ÷ 100 = 60 × 70 ÷ 100 = 42 kWh. Because 12% of what's pulled from the outlet is lost as heat during charging, energy actually drawn from the outlet = 42 ÷ (1 − 0.12) = 42 ÷ 0.88 ≈ 47.73 kWh. Cost = 47.73 kWh × $0.13/kWh ≈ $6.20.
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.
Why does a 10% charging loss add more than 10% to my cost?+
The loss percentage is applied by division, not subtraction: energy drawn from the outlet = energy added to the battery ÷ (1 − loss%). At a 10% loss, that means dividing by 0.9, which adds about 11.1% to the energy you're billed for — not exactly 10%. The higher the loss percentage, the bigger that gap gets.
What happens if I leave the starting or target charge percentage blank?+
The calculator treats a blank starting charge as 0% and a blank target charge as 100%, so it will estimate the cost of a full charge from empty rather than showing an error. Fill in both fields with your actual charge window for an accurate estimate.
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<a href="https://everyfix.net/tools/ev-charging-cost-calculator/">EV Charging Cost Calculator</a> by <a href="https://everyfix.net">EveryFix</a>Related Tools
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