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EV Charging Cost Calculator
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This EV Charging Cost Calculator estimates how much it costs to charge an electric vehicle, based on the battery's capacity, the charge range you're adding (e.g. 20% to 100%), your electricity rate, and the charger's efficiency — since some energy is lost as heat during charging, not all electricity drawn from the wall reaches the battery. Enter your vehicle's battery size in kWh, the charge percentages, and your local electricity rate, and get an instant cost estimate along with the actual energy drawn from the wall. It's useful for budgeting home charging costs or comparing them against fuel costs. Everything runs locally in your browser. Scroll down to enter your details.
Features
- Calculates charging cost from battery %, capacity, and rate
- Accounts for charger efficiency losses
- Shows both energy added to the battery and energy drawn from the wall
- Instant recalculation as you adjust inputs
Why use this ev charging cost calculator?
- More accurate than assuming 100% charging efficiency
- Useful for comparing EV running costs to fuel costs
- Fully private — nothing uploaded
- Free with unlimited use
Frequently asked questions
Why isn't charger efficiency 100%?
Some energy is lost as heat during AC-to-DC conversion and battery management, so the electricity drawn from the wall is always somewhat more than what actually reaches the battery — typically 85-95% efficient for home charging.
Where do I find my battery's capacity?
Check your vehicle's manual or manufacturer specifications, usually listed in kWh (e.g. a common mid-size EV might have a 60-75 kWh battery).
What electricity rate should I use?
Use your actual per-kWh rate from your electricity bill; if you're on a time-of-use plan, calculate separately for off-peak vs. peak charging rates.
How does this compare to gasoline cost?
Use this tool's result alongside the site's Fuel Cost Calculator for the same trip distance to compare running costs between an EV and a gas vehicle.
Does this include public fast-charging fees?
No, it assumes a flat per-kWh electricity rate; public fast chargers often bill differently (per-minute or with session fees) — adjust the rate field to approximate that if needed.