EV Charging Cost Calculator 2026
By Aidan Jad with Axis Intelligence Research · Last updated: October 3, 2026 · Rates as of: electricity July 2026, gasoline week of September 28, 2026
Quick answer: At the U.S. average residential electricity price of 18.31¢/kWh (EIA, July 2026), an EV using 27 kWh per 100 miles costs about $5.53 per 100 miles to charge at home on Level 2, once charging losses are counted. Axis Intelligence Research estimates that is about 34% of the gas bill for a 27.2 mpg car at $4.465/gal.
What Does This EV Charging Cost Calculator Do?
It answers three questions in one screen: what a single charge costs (battery size, start and end percentage, your rate), what driving costs per mile, per month and per year, and how that compares with a gas car at regional EIA pump prices. It counts the electricity lost between the wall and the battery, splits home and public charging, and returns two Axis metrics, the Break-Even Gas Price and the Plug-to-Pump Ratio. Every default is sourced and dated. Share your exact scenario with “Copy link”.
How Much Does It Cost to Charge an Electric Car at Home?
Multiply the energy the battery takes by your rate, then divide by charging efficiency, because the meter bills what leaves the wall, not what lands in the pack.
Cost per charge = battery kWh × (end % − start %) ÷ efficiency × rate
Worked example, using the tool’s defaults: a 75 kWh pack charged from 20% to 80% takes 45 kWh. At 89.4% Level 2 efficiency the wall supplies 50.3 kWh. At 18.31¢/kWh, that charge costs $9.22 and adds about 167 miles at 27 kWh/100 mi. Roughly 5.3 kWh of the bill never reaches the battery.
Level 1 vs Level 2: does the charger change the bill?
It does, a little. A 2014 field comparison by Sears and colleagues measured average grid-to-battery efficiency of 83.8% on Level 1 (120 V) and 89.4% on Level 2 (240 V). On the same 45 kWh session, Level 1 pulls 53.7 kWh from the wall, about 3.4 kWh more than Level 2. Small per session, but it compounds over a year of 120 V charging, and losses grow in cold weather.
How Much Does an EV Cost per Mile?
EV cost per mile = (kWh/100 mi ÷ 100) ÷ efficiency × rate
At 27 kWh/100 mi (the example vehicle used by the Department of Energy’s Alternative Fuels Data Center), 89.4% efficiency and 18.31¢/kWh, home charging works out to $0.055 per mile, or $5.53 per 100 miles.
Your window sticker is the better input. The EPA label lists kWh/100 mi; a large truck or SUV can sit well above 27, a small sedan below. Replace the default with your number.
Home vs public charging
Public fast chargers bill per kWh delivered at a price set by each network, and Electrify America, for one, publishes real-time prices only in its app and on the charger screen. So the tool does not guess a national public price. Set your home share below 100% and enter your network’s price, and the blended cost per mile updates. This is where the EV advantage erodes fastest: drivers who rely on DC fast charging pay a different fuel than drivers who plug in at home overnight.
Is Charging an EV Cheaper Than Gas?
At national averages, yes, by a wide margin. EIA’s weekly survey put regular gasoline at $4.465/gal for the week of September 28, 2026, and EPA reports a record 27.2 mpg real-world average for model year 2024 new vehicles. That is $0.164 per mile.
| Scenario (11,026 mi/yr) | Cost per mile | Cost per year | Source of inputs |
|---|---|---|---|
| EV, home Level 2, 27 kWh/100 mi, 18.31¢/kWh | $0.055 | $610 | EIA; DOE AFDC; Sears et al. 2014 |
| Gas car, 27.2 mpg, $4.465/gal | $0.164 | $1,810 | EIA; EPA |
| Difference (Axis Intelligence Research estimate) | $0.109 | $1,200 | Calculated |
The 11,026 miles is FHWA’s average annual mileage for a car (Highway Statistics 2024, Table VM-1, as published by the DOE AFDC).
What is the Break-Even Gas Price?
The Break-Even Gas Price is an Axis Intelligence Research metric: the pump price at which the gas car would cost exactly as much per mile as charging the EV. Break-even = EV cost per mile × gas car mpg.
With the defaults it is $1.50/gal. Put differently, gasoline would have to fall to about a third of its September 2026 national price before the gas car caught up with home charging. The tool recomputes it for your rate, your vehicle and your share of public charging, which is the scenario where the break-even climbs.
What is the Plug-to-Pump Ratio?
The Plug-to-Pump Ratio is the EV’s cost per mile as a share of the gas car’s. At the defaults it is 34%: the EV driver pays roughly a third of the fuel bill. A ratio near or above 100% means your charging mix has erased the fuel saving.
Gas Prices by Region Used in the Calculator
| Region (EIA) | Regular, $/gal, week of Sep 28, 2026 |
|---|---|
| U.S. average | 4.465 |
| East Coast (PADD 1) | 4.290 |
| Midwest (PADD 2) | 4.291 |
| Gulf Coast (PADD 3) | 3.924 |
| Rocky Mountain (PADD 4) | 4.486 |
| West Coast (PADD 5) | 5.724 |
| California | 6.189 |
Source: U.S. Energy Information Administration, Gasoline and Diesel Fuel Update.
How It Works
All figures are calculated in your browser; nothing is sent to a server. Axis Intelligence Research uses these formulas:
- Battery energy added = capacity × (end % − start %)
- Energy billed = battery energy ÷ charging efficiency
- Home cost per mile = (kWh/100 mi ÷ 100) ÷ efficiency × home rate
- Public cost per mile = (kWh/100 mi ÷ 100) × public rate (billed at the charger, no extra loss applied)
- Blended cost per mile = home share × home + (1 − home share) × public
- Gas cost per mile = gas price ÷ mpg
- Break-Even Gas Price = EV cost per mile × mpg
- Plug-to-Pump Ratio = EV cost per mile ÷ gas cost per mile
| Default | Value | Source | As of |
|---|---|---|---|
| Home electricity | 18.31¢/kWh | EIA Electricity Monthly Update | July 2026 |
| Level 2 efficiency | 89.4% | Sears et al., 2014 | 2014 [older data] |
| Level 1 efficiency | 83.8% | Sears et al., 2014 | 2014 [older data] |
| Vehicle efficiency | 27 kWh/100 mi | DOE AFDC (illustrative) | retrieved Oct 3, 2026 |
| Gas car economy | 27.2 mpg | EPA Automotive Trends | MY2024 |
| Annual miles | 11,026 | FHWA via DOE AFDC | 2024 |
| Gas prices | see table above | EIA | Sep 28, 2026 |
The battery size (75 kWh) and the 20–80% window are neutral example inputs, not statistics.
Why It Matters
Most EV cost calculators multiply kWh by price and stop. That skips the charging losses you pay for and ignores where you charge. On a 45 kWh session the losses alone are worth a few kWh; across a year of Level 1 charging, or a commute fed by fast chargers, the gap between the brochure number and the bill becomes real money. The Break-Even Gas Price turns the comparison into a single number anyone can check against the next pump price.
Limitations
- The national residential average hides wide variation by state and utility. Enter your own rate from your bill, including any time-of-use off-peak rate.
- Efficiency figures come from a 2014 study; newer onboard chargers may do better, and cold weather does worse. The field is editable.
- Vehicle consumption rises in winter and at highway speed; the kWh/100 mi field is a single average.
- Fixed charges, demand charges, idle fees, membership fees and charger installation costs are not included.
- Gas prices move weekly; the comparison reflects one week.
Data Freshness
Constants last updated October 3, 2026.
FAQ
How much does it cost to fully charge an electric car?
Battery kWh ÷ efficiency × your rate. A 75 kWh pack from empty to full at 18.31¢/kWh and 89.4% efficiency is about $15.36. Most owners charge to 80%, not 100%.
What is the average cost of electricity for EV charging?
The U.S. average residential price was 18.31¢/kWh in July 2026, 4.9% higher than July 2025, according to EIA.
Is it cheaper to charge at night?
Only if your utility has a time-of-use plan with a lower off-peak rate. Enter that off-peak rate in the calculator.
How many kWh does it take to drive 100 miles?
It depends on the vehicle. DOE’s worked example uses 27 kWh per 100 miles; check the kWh/100 mi figure on your EPA window sticker.
Related Resources
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Cite this tool: Axis Intelligence Research. (2026). EV Charging Cost Calculator. https://axis-intelligence.com/ev-charging-cost-calculator/