Home charging is usually cheaper per kilowatt-hour than public charging, particularly public DC fast charging—but the lowest-cost option for you depends on your utility tariff, when you charge, the station’s pricing and fees, and your car’s energy use. Compare the cost of the same amount of energy or the same driving distance, using current local prices rather than treating a national average as a quote.
Start with the comparison that answers your question
There are two useful ways to compare charging costs. Price per kilowatt-hour (kWh) shows what you pay for energy. Cost per mile estimates what you pay to drive, accounting for how efficiently your particular EV uses that energy. The first is easier to compare across charging locations; the second is more useful for budgeting.
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Keep the comparison like for like. Use the same vehicle consumption assumption for both home and public charging, and compare the same energy amount or distance. Do not compare a home off-peak price with a public peak price without identifying the timing. Treat electricity charges separately from the purchase and installation of home charging equipment.
It also helps to distinguish the price of energy from the price of a charging visit. A per-kWh rate can be converted directly into an energy cost, while a session charge or parking fee is an additional cost of using that location. For an all-in comparison, count the charges that would apply to your actual visit. For a simple energy-rate comparison, label those extra charges separately so the two figures are not confused.
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Calculate electricity cost
For a price stated per kWh, multiply the energy dispensed by the applicable price:
Charging cost = kWh charged × price per kWh
For example, if a session adds 20 kWh at a rate of $0.25 per kWh, the energy charge is $5. This calculation does not include any separate session, parking, time-based, subscription, or idle fee.
If the public station bills by time or by session rather than by kWh, the formula needs to reflect that billing method. A fixed session charge is added to the energy charge if both apply; a time-based price depends on the billed duration. Do not convert a flat visit fee into a per-kWh price without also stating how much energy was delivered, because the implied energy cost changes with the size of the session.
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Calculate cost per mile
Use the vehicle’s energy consumption to connect electricity cost to driving distance. If your car uses E kWh to travel 100 miles, then:
Energy cost per 100 miles = E × price per kWh
Energy cost per mile = (E × price per kWh) ÷ 100
Use the consumption figure that best represents your own driving rather than assuming every EV uses the same amount. If you track both charging and mileage, you can estimate your own energy cost over a consistent period. A comparison based on the amount the car actually receives is more useful than comparing session totals of different sizes.
For an all-in public cost per mile, add applicable session, parking, time, subscription, or idle charges to the energy charge, then divide by the miles associated with that energy. Keep the period and assumptions consistent: a subscription may cover several visits, for example, so account for its cost over the use you expect rather than assigning it to a single session without explanation. At home, keep one-time equipment costs distinct from the recurring electricity cost unless you are deliberately comparing total ownership costs over a defined period.
What the published U.S. benchmarks can—and cannot—tell you
A 2024 U.S. Department of Energy Alternative Fuels Data Center (AFDC) and National Renewable Energy Laboratory (NREL) technical report gives approximate charging-cost benchmarks of about $0.17/kWh for home AC Level 2, $0.20–$0.25/kWh for public AC Level 2, and $0.40–$0.60/kWh for public DC fast charging. These are dated national estimates, not live prices or a quote for a particular utility, station, or driver in 2026.
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- Indication Displays - LED display that can tell you the status as well as indicate errors while charging your electric vehicle.
The benchmark spread illustrates why it matters to distinguish public AC charging from DC fast charging. It does not establish what a local station charges, whether a fee applies, or what a household’s marginal electricity rate is. For a personal comparison, check the utility plan that applies during your charging hours and the station’s current price and terms.
| Charging option | Approximate benchmark | What to verify locally |
|---|---|---|
| Home AC Level 2 | About $0.17/kWh | Your utility’s applicable rate at the time you charge, including whether a time-of-use plan applies |
| Public AC Level 2 | $0.20–$0.25/kWh | Current station price and any session, parking, time, subscription, or idle charges |
| Public DC fast charging | $0.40–$0.60/kWh | Current station price and the fees or time rules that apply to your session |
The AFDC consumer guidance says drivers can normally expect to pay more at public stations, especially DC fast-charging stations, than for electricity used to charge at home. It also notes that some locations offer free charging. Free charging is a local offering, not a price assumption to use for a general budget.
In its Electric Vehicles for Consumers guidance, the U.S. Department of Energy’s AFDC puts the general pattern this way: “Although some locations offer free charging, drivers can normally expect to pay more when using public stations (especially DCFC stations) than for electricity costs incurred when charging at home.” The wording is a broad expectation, not a guarantee for every location or charging session.
Find the home price that actually applies
For home charging, use the marginal electricity price under your utility plan during the hours the car is plugged in. A household’s average bill divided by its total electricity use may not reflect the incremental cost of charging the car, especially when the plan changes prices by time of day or includes special EV terms.
The key is to identify the rate that applies to the additional electricity used by the vehicle—not simply to divide the household’s total bill by its total kWh. A bill may contain charges beyond a per-kWh energy rate, and a time-of-use plan can make the price depend on when energy is used. Use the utility’s current rate information and the terms that apply to your account.
Check the tariff and charging window
- Find your current utility rate plan and identify the price per kWh for the hours you typically charge. Use the utility’s own bill or rate information, not an assumed national average.
- If the rate changes by time, match the applicable off-peak or on-peak period to your actual charging schedule. A lower off-peak rate helps only to the extent that charging can take place in that lower-priced window.
- Check whether an EV time-of-use rate applies only to the vehicle or changes the price for the whole household. Consider the household’s full bill impact, not just the EV’s charging line.
- Apply the resulting rate to the energy the car receives. Keep any separate equipment purchase or installation expense outside the ongoing electricity calculation.
Time-of-use (TOU) plans can make home charging less expensive when charging moves to a lower-priced period. But the rate design and the rest of the household’s electricity use matter. A plan advertised as cheaper for EV charging is not automatically cheaper for the household overall; check the applicable terms and compare the bill impact.
Before switching plans, look at both the EV’s charging schedule and the household’s other electricity use. A lower-priced period is only useful if the vehicle can charge during it, and a plan that changes rates for the whole household should be judged on the whole bill. The relevant comparison is not merely “EV rate versus public rate”; it is the cost under the tariff you would actually use, given your schedule and account terms.
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Compare public stations by their full pricing structure
A public station’s headline rate may not be the whole cost of a visit. Pricing can be stated per kWh, per session, by time, or through a subscription. Some stations may offer free charging, but availability is local and can change. Check the terms for the specific charger and session rather than assuming every station uses the same billing method.
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- Per kWh: Multiply the energy delivered by the station’s current rate.
- Per session: Include the session charge in the total, even if little energy is delivered.
- By time: Determine which time unit is billed and how long you expect to be connected. The total may depend on charging duration rather than just energy delivered.
- Subscription: Include a subscription cost when it applies to your use. A lower per-session or per-kWh price does not by itself show whether subscribing saves money.
Also check for parking charges, idle fees, and other time-based charges that may begin or continue under the station’s terms. A station host may set fees to recover operating costs or generate revenue. A fair comparison counts the fees that your session would incur, rather than treating an advertised energy rate as the complete visit cost.
For a subscription, compare what you expect to pay with and without it over the same period and expected number of charging sessions. Include the subscription charge as well as any remaining session or energy fees. The lower advertised rate is not enough on its own to determine which option costs less, and the answer can change with usage.
Likewise, check whether a station’s posted price is per kWh, per minute or hour, or a combination, and whether parking is billed by the property separately. The price shown for energy may not describe the entire time spent at the site. Idle charges in particular make the station’s terms and the length of your visit relevant to the total.
Compare public AC and DC fast charging separately
Public AC Level 2 and DC fast charging are distinct cases in the AFDC/NREL 2024 benchmarks, with the latter’s approximate national range higher. When estimating a trip or routine charging cost, compare the kind of public charging you expect to use. A price from a public AC station is not a substitute for the rate at a DC fast charger, and vice versa.
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For a useful estimate, identify the charging type at the location you would actually use, then apply its own current price and billing rules. A public Level 2 price may be relevant to a planned stop where that is the available option; a DC fast-charging price is the relevant one when estimating use of a fast charger. Combining them into a single public-charging average can conceal a meaningful difference in cost.
Turn the rates into an apples-to-apples example
Suppose, purely for illustration, a driver’s car uses 30 kWh to cover 100 miles. This is an assumed value for demonstrating the arithmetic, not a claim about typical EV efficiency. Applying the 2024 approximate benchmarks gives the following electricity-only estimates:
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- CONTROL FROM YOUR PHONE: A stronger built-in antenna keeps the charger online even in a garage or basement. Use the free app to start and stop charging, set the charging speed (6-48A), get reminders, and track how much energy and money each charge uses. Requires a 2.4 GHz home WiFi network.
- SAFETY-CERTIFIED & WEATHERPROOF: Independently tested and certified (UL, ETL, FCC, Energy Star). A fully sealed IP66 / NEMA 4 housing stands up to rain, snow, heat and dust indoors or out, and internal steel shielding protects the electronics for years of reliable use.
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| Charging option | Calculation for 100 miles | Illustrative energy cost |
|---|---|---|
| Home AC Level 2 at about $0.17/kWh | 30 kWh × $0.17 | $5.10 |
| Public AC Level 2 at $0.20–$0.25/kWh | 30 kWh × $0.20–$0.25 | $6.00–$7.50 |
| Public DC fast charging at $0.40–$0.60/kWh | 30 kWh × $0.40–$0.60 | $12.00–$18.00 |
These calculations apply the report’s dated approximate national rates to the stated 30-kWh example. They exclude station fees and home equipment costs, and they are not a forecast of any reader’s bill. To make the figures personal, replace both the assumed consumption and benchmark rate with your car’s energy use and local current rates. Add applicable public charges separately.
The comparison works because the same 30 kWh is used for each option. If your car uses a different amount of energy over 100 miles, substitute that figure in all three calculations. If your home rate has an off-peak and on-peak price, calculate the home result with the rate that matches the charging time; do not silently assume every session receives the cheapest rate.
You can also begin with a target distance. First estimate the energy needed for that distance using your vehicle’s own consumption, then multiply that energy by the applicable rate. For a public station, add the charges imposed by that session. This keeps the comparison grounded in the same distance even when the two options use different prices or billing methods.
Keep home equipment costs separate from the electricity bill
The cost of electricity is only one part of home charging. A Level 1 cordset is commonly supplied with an EV, according to AFDC consumer guidance. Level 2 home charging equipment and its installation are separate costs; their price is not included in a per-kWh comparison of ongoing electricity.
Ask the vehicle maker or dealer which equipment is suitable for the car, and have the installation needs for your home evaluated. Do not assume that a charger is compatible or that installation is straightforward based only on an energy-price comparison. If you are deciding whether to install Level 2 equipment, first separate the one-time equipment and installation expense from the recurring electricity savings you expect. The information here does not establish an individualized installation cost or a payback period.
When comparing an existing home setup with public charging, the electricity calculation is the recurring-cost comparison. When deciding whether to buy and install Level 2 equipment, treat the equipment and installation as a separate decision and obtain information specific to your vehicle and home. Mixing a one-time purchase into one option while leaving the other as a per-kWh rate produces an unclear comparison.
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- Use your actual utility plan and the rate that applies during the hours you charge.
- Check whether an EV TOU plan affects only the vehicle or the household’s full electricity bill.
- Record the current price for the public station and charging type you actually expect to use.
- Read the station terms for session, time-based, parking, subscription, and idle charges.
- Use the same vehicle energy-consumption figure for the home and public calculations.
- Compare electricity-only costs separately from equipment and installation costs.
- Treat dated national benchmarks as context, then verify local utility tariffs and station prices before making a decision.
A quick worksheet can make the comparison reproducible: write down the charging type, price basis, applicable rate, kWh or billed time, and extra charges for each option. Then note the vehicle consumption assumption and the distance or energy being compared. This makes it easier to spot a hidden mismatch, such as one option including a session charge while the other shows energy only.
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- [Smart WIFI APP, You can Set the Charging Period]: By APP, you can wirelessly check the charging cost, history, fully-charged notification, track the charging status, during off-peak period, etc. [Wi-Fi Reset/Factory Reset Function, Add New Device Quickly]: If you can't find your device or you have replaced a new phone, just pull out the charging latches, simultaneously long press the Ⓐ button and time adjustment button on the product screen until it shows "Factory Reset", then wait 3-5 seconds and re-start your device.
Which option is cheaper for your use?
Home charging is a useful lower-cost baseline, but the answer for a particular driver comes from the actual rates and schedule. If your home’s applicable rate is below the public station’s all-in cost for the same delivered energy, home charging costs less for that energy. If you rely on public charging, calculate the full charge under its billing rules rather than comparing only its per-kWh figure. For a distance comparison, apply the same vehicle consumption to each price and include relevant station fees.
Because utility tariffs, station rates, fees, and free-charging availability are local and can change, recheck them when your charging pattern or provider terms change. The 2024 AFDC/NREL ranges are useful orientation, not an individualized answer.
Frequently Asked Questions
Is it cheaper to charge an EV at home or at a public charger?
Home charging is generally cheaper per kWh, especially compared with public DC fast charging. Your actual result depends on your utility rate and charging hours, the public station’s current price and fees, and the vehicle’s energy use. Compare the same energy or distance using local prices.
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For a per-kWh price, multiply the kWh added by that rate. Add any separate session, time, parking, subscription, or idle charges that apply. For a cost-per-mile estimate, use your own vehicle’s kWh consumption over a stated distance and divide the resulting energy cost by that distance.
Are public Level 2 and DC fast charging costs the same?
No. They are separate charging types and should be compared separately. AFDC/NREL’s approximate 2024 U.S. benchmarks were $0.20–$0.25/kWh for public AC Level 2 and $0.40–$0.60/kWh for public DC fast charging. Check current local prices and station terms.
Can a time-of-use electricity plan lower home charging costs?
It can if the car charges during a lower-priced period, but the plan’s design matters. Check whether EV-specific terms apply only to the vehicle or affect the whole household, and consider the full bill impact.
Does a public charger’s posted rate include parking or idle fees?
Not necessarily. Check the specific station’s terms for session charges, time-based pricing, parking, subscription costs, and idle fees. Include the charges your visit would incur when comparing all-in costs.
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No. Equipment purchase and installation are separate from the ongoing electricity price. AFDC consumer guidance says a Level 1 cordset is commonly supplied with an EV; ask the vehicle maker or dealer about suitable Level 2 equipment and have your home’s installation needs evaluated.
The Bottom Line
For a fair comparison, use the utility rate that applies when you charge, the current price and fees for the public charger you would actually use, and your vehicle’s own energy consumption. Home charging is generally the lower-cost baseline, while public DC fast charging can cost more; the result for you depends on local rates, timing, billing rules, and fees. Keep equipment and installation costs separate from ongoing electricity costs.
Quick Recap
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