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EV Charging Cost Calculator

Estimate what it costs to charge your EV, losses included.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter your battery capacity in kWh and your electricity rate per kWh in your own currency.
  2. 2.Set your starting charge percent and your target charge percent — the target defaults to 80%.
  3. 3.Adjust the charging efficiency if needed (AC home charging is about 85-90%) and read the total cost instantly below.

About EV Charging Cost Calculator

This EV charging cost calculator shows what a charge actually costs the moment you enter your numbers. Type your battery capacity in kWh, your starting and target charge percentages, your electricity rate per kWh, and your charging efficiency, and it returns the total cost along with the energy added to the battery, the energy pulled from the grid, and how much is lost to charging. There is no button to press and nothing is uploaded, so it is fast and private.

The math is deliberately not a single multiplication, because a naive estimate understates the bill. First it finds the energy that has to reach the battery: capacity multiplied by the gap between your target and starting charge. Charging from 20% to 80% on a 60 kWh battery, for example, means 60 x (80 - 20) / 100 = 36 kWh into the battery. It then divides that by your charging efficiency to get the energy actually drawn from the grid, because some energy is always lost as heat in the cable, the onboard charger, and the battery. At 90% efficiency, 36 kWh into the battery needs 40 kWh from the wall. Finally it multiplies the grid energy by your rate, so 40 kWh x 0.30 = 12.00 in your currency.

Why charging losses matter: you pay for the energy leaving the meter, not the energy that lands in the battery. Alternating-current (AC) home and workplace charging typically loses roughly 10 to 15% of the energy, an efficiency of about 85 to 90%, which is why 90% is used as the sensible default. Direct-current (DC) rapid charging is usually a little more efficient at the connector because it bypasses the car's onboard AC converter, but it almost always costs far more per kWh, so a fast charge on the road usually works out dearer than a slow charge at home even though less energy is wasted. Ignoring efficiency makes every estimate look cheaper than the real bill.

How to pay less: charge at home on an off-peak or overnight tariff, where the per-kWh rate can be a fraction of the public network price, and put that lowest rate into the rate field to see the difference. Charging on a proper 240-volt Level 2 unit is slightly more efficient than trickle-charging from a standard wall socket, so more of what you pay reaches the battery. Routinely stopping at 80% rather than 100% is easier on the battery and skips the slow, less efficient top-up phase near a full charge.

Everything runs in your browser, so your numbers never leave your device. The currency is neutral: whatever unit you use for the rate is the unit of the answer, so it works for dollars, euros, pounds, or any other currency. To convert kWh into other energy units, use an energy converter; for quick arithmetic on a monthly bill, reach for a basic or average calculator.

Frequently asked questions

How much does it cost to charge an EV?
It depends on how much energy you add, your charging efficiency, and your electricity rate. Charging a 60 kWh battery from 20% to 80% adds 36 kWh; at 90% efficiency that draws 40 kWh from the grid, so at 0.30 per kWh the charge costs 12.00 in your currency.
Why is the energy drawn from the grid higher than the energy added to the battery?
Charging is never 100% efficient. Energy is lost as heat in the cable, the onboard charger, and the battery, so the grid always supplies more than lands in the battery. AC home charging typically loses about 10 to 15%, and you pay for that lost energy too.
What charging efficiency should I enter?
For AC home or Level 2 charging, about 85 to 90% is typical, so 90% is a safe default. DC rapid charging is usually a little more efficient at the connector, but it costs more per kWh. If you know your car or charger's figure, enter it for a more accurate result.
Is charging at home cheaper than using a fast charger?
Usually yes. Home and especially off-peak overnight tariffs often charge a fraction of the per-kWh price of public rapid chargers, so a slow home charge normally works out cheaper overall even though a small amount more energy is lost to AC charging.
Does this calculator work in my currency?
Yes. It is currency-neutral: the answer comes out in whatever currency you use for the electricity rate. Enter your rate in dollars, euros, pounds, or any other currency and the total cost is shown in that same currency.

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