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EV Charging Cost Calculator Guide
Charging an electric car is far cheaper than filling a tank, but the numbers depend on your electricity rate and how much you actually put in. This calculator works out the cost, time, and range added for a charging session.
Energy added = battery size × the percentage you're adding. Multiply by your electricity price, then allow about 10% for charging losses — the power that goes in but never reaches the battery.
How Much Does It Cost to Charge an EV?
Taking a 75 kWh battery from 20% to 80% adds 45 kWh. With around 10% charging loss you're billed for about 50 kWh, so at $0.15 per kWh that's roughly $7.50 for about 158 miles of range — under 5 cents a mile.
Charging Losses Are Real
Your meter always records more energy than the battery receives. Some is lost as heat in the charger, the cable, and the battery itself. Around 10% is typical for home AC charging, which is why the billed figure here is higher than the energy added — ignoring it understates your real cost.
Why 20% to 80%?
Charging speed drops sharply above 80% as the car protects the battery, so the last 20% can take as long as the first 60. Most manufacturers suggest keeping daily charging in the 20–80% band and only going to 100% before a long trip.
Home vs Public Charging
Home charging on an overnight rate is by far the cheapest way to run an EV. Public rapid chargers can cost three to four times as much per kWh — convenient on a trip, expensive as a habit. Level 1 charging from a normal household socket works but is slow enough that it only suits low daily mileage.
These results are estimates for education and planning, not financial advice. Actual returns, rates, and terms vary — check with a qualified professional before making decisions.
Related: EV Range Calculator, Fuel Cost Calculator, and Gas Mileage Calculator.
Frequently Asked Questions
How much does it cost to charge an electric car?
Take the kWh you're adding and multiply by your electricity rate, plus about 10% for losses. A 75 kWh car from 20% to 80% at $0.15/kWh costs roughly $7.50.
Why is charging only recommended to 80%?
Charging slows sharply above 80% to protect the battery, so the last stretch takes disproportionately long. Most makers suggest 20–80% for daily use.
How long does it take to charge an EV?
Divide the kWh you need by the charger's power. Adding 45 kWh on a 7.4 kW home charger takes about 6 hours; a 150 kW rapid charger does it in well under an hour.
Is charging at home cheaper than public charging?
Much cheaper. Home rates, especially overnight tariffs, are typically a third or a quarter of what public rapid chargers cost per kWh.
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