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How Much Does It Cost to Charge an EV at Home?

One formula, no mystery: kWh times your price per kWh. Here's the math worked out for different battery sizes — plus a calculator to plug in your own rate and car.

By Stephen V.Last updated How we pick

This is the number almost nobody in the charger business will show you, and it’s genuinely simple. The cost of a charge is the energy you add, times what you pay for energy: kWh × price per kWh. Everything else — cost per mile, cost per month, savings versus gas — falls out of that one line. Below we work it for a few battery sizes at a typical rate, then hand you a calculator to use your own numbers.

Your two inputs

You need exactly two things. Your battery’s usable capacityin kWh, which is on your car’s spec sheet (small EVs are around 40–60 kWh, larger ones 75–100+). And your electricity priceper kWh, which is on your utility bill — US residential rates commonly run 12 to 20 cents. Put those together and you have the cost of a full charge. That’s it.

Worked examples at 15¢/kWh

Using a mid-range 15 cents per kWh and a typical efficiency of about 3.5 miles per kWh, here’s what a full charge looks like across battery sizes. (Real-world charging draws a little more than the usable battery figure because of charging losses, roughly 10% — a rounding-level effect at these prices.)

Battery sizeFull charge costApprox. rangeCost per mile
40 kWh (compact EV)$6.00~140 mi~4.3¢
60 kWh (mainstream EV)$9.00~210 mi~4.3¢
80 kWh (large EV / SUV)$12.00~280 mi~4.3¢
100 kWh (big battery)$15.00~350 mi~4.3¢

Notice the cost per mile is the same across every row — it doesn’t depend on battery size, only on your rate and your car’s efficiency. A bigger battery costs more to fill simply because it holds more energy and goes further. What you pay per mile is set by price per kWh ÷ miles per kWh.

Run your own numbers

Swap in your actual battery size, your real electric rate, and your car’s efficiency to get your figure. Nothing here is hidden — it’s the same arithmetic as the table.

Cost-to-charge calculator

Drop in your battery size, your electric rate and your car’s efficiency. The math is kWh × price per kWh— nothing hidden.

$9.00

a full charge

210 mi

range from full

4.3¢

per mile

$4.29

per 100 miles

A rough real-world charge draws a little more than the battery’s usable kWh because of charging losses (about 10%). Use your own utility rate — US residential rates are commonly 12–20¢/kWh.

How to pay even less

Two moves cut the number further. If your utility offers a time-of-use rate, schedule charging for the cheap overnight window — a smart chargeror your car’s own app can do this automatically, and off-peak rates can be a fraction of the daytime price. And because you’re charging at home rather than at a public fast charger, you’re already paying a fraction of public rates. Put next to gas, the gap is usually stark — which is exactly what our EV-vs-gas comparison works out.

Frequently asked questions

How much does it cost to charge an EV at home?

Multiply your battery's usable kWh by your price per kWh. At about 15 cents per kWh, filling a 60 kWh battery costs roughly $9 for around 250 miles — about 3.6 cents per mile. Your exact figure depends on your local electricity rate, usually 12-20 cents per kWh.

How do I calculate my own cost to charge?

Take your battery size in kWh (from the spec sheet), multiply by your electricity price per kWh (from your utility bill), and that's the cost of a full charge. For cost per mile, divide your price per kWh by your car's efficiency in miles per kWh. Our calculator does it for you.

Does charging at home add much to my electric bill?

For an average driver, charging typically adds roughly $30-$60 a month to a home electric bill — far less than a monthly gas budget for the same miles. The exact amount scales with how much you drive and your rate.

Is overnight charging cheaper?

It can be significantly cheaper if your utility offers a time-of-use rate with lower overnight prices. Scheduling your charger (or your car) to charge in those off-peak hours is one of the easiest ways to cut the cost further.

Sources

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