Category
Automotive
EV Charging Cost Calculator
Estimate EV charging cost from kWh used, electricity rate, and charging frequency
Estimated time
1 min
EV Charging Inputs
Estimate charging cost from usable kWh per session, electricity rate, charging frequency, and charging losses.
Energy added to the battery per charging session (kWh), before charging losses are applied.
kWh
$
Estimated charging inefficiency as a percentage of energy drawn from the grid.
%
Formula Summary
Grid kWh/charge = battery kWh / (1 - charging loss%)
Cost per charge = grid kWh/charge x $/kWh
Monthly charging cost = cost per charge x sessions per month
Annual charging cost = monthly charging cost x 12
Cost per mile = $/kWh / (miles per kWh x (1 - charging loss%))
How It Works
This calculator estimates both per-session and monthly charging cost using billed grid energy rather than battery energy alone.
It also calculates effective energy cost per mile using your vehicle efficiency assumption.
- Grid kWh/charge = battery kWh per charge / (1 - charging loss%).
- Cost per charge = grid kWh/charge x electricity rate.
- Monthly cost = cost per charge x sessions per month.
- Annual cost = monthly cost x 12.
- Cost per mile = electricity rate / (miles per kWh x (1 - charging loss%)).
Example Calculations
Home charging baseline
52 kWh/session, $0.17/kWh, 10 sessions/month, 12% loss, 3.4 miles/kWh
$10.05/charge, $100.50/month, about $0.057/mile
Home charging can stay low-cost per mile when rates are moderate and efficiency is strong.
Higher utility rate area
52 kWh/session, $0.29/kWh, 10 sessions/month, 12% loss, 3.4 miles/kWh
$17.14/charge, $171.40/month, about $0.097/mile
Utility rate differences have a direct and significant effect on EV running cost.
More frequent charging
45 kWh/session, $0.19/kWh, 16 sessions/month, 10% loss, 3.0 miles/kWh
Monthly cost rises with session count despite smaller per-session energy
Monthly total is strongly driven by both session size and charging frequency.
Frequently Asked Questions
Why include charging loss?
You pay for grid energy delivered to the charger, which is typically higher than battery energy stored.
What miles per kWh should I use?
Use your real driving average from vehicle telemetry or trip history. Efficiency varies by speed, weather, and tires.
Can I model public charging rates?
Yes. Enter your effective public charging $/kWh rate to compare against home charging scenarios.
Does this include charging network fees?
No. Add any fixed session fees separately if your provider charges them.
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