How the calculator works
Energy used each month is your miles multiplied by your car's kWh per 100 miles, divided by 100. That energy times your home electricity rate is the home charging cost, and times the Supercharger rate is the Supercharging cost. The gas comparison is your miles divided by the gas car's MPG, times the gas price. Savings are the gas cost minus the charging cost.
The efficiency defaults are the EPA combined ratings published on fueleconomy.gov. The EPA measures electricity drawn from the wall, so typical charging losses are already included. Expect higher use in winter, at sustained highway speeds and on larger wheels, so it is worth trying a higher kWh/100 mi number to see a worst case. For a deeper look at winter driving, see Tesla winter driving tips.
Most owners charge mainly at home and use Superchargers on road trips, so your real monthly cost will usually sit between the home and Supercharger rows. Comparing two trims? Read Model Y Performance vs Long Range.
Sources
- Efficiency (kWh/100 mi): EPA combined ratings for 170 Tesla trims (Model S and Model X 2016–2026, Model 3 2017–2026, Model Y 2020–2026, Cybertruck 2025–2026) from the fueleconomy.gov vehicle data, rounded to the whole number fueleconomy.gov displays, checked Oct 23, 2026. The link under the trim selector opens the EPA page for the trim you pick, and you can browse all of them on fueleconomy.gov.
- Home electricity rate: U.S. average residential price, 18.16 cents/kWh for August 2026 (EIA Electric Power Monthly, Table 5.6.A, released Oct 23, 2026), rounded to $0.18. EIA Table 5.6.A, checked Oct 23, 2026.
- Supercharger rate (example): $0.43/kWh is an example close to the average Tesla member rate tracked for October 2026 by DCFC Tracker ($0.434/kWh, month in progress) and the Q3 2026 average of $0.396/kWh reported by Electrek (Oct 13, 2026). Tesla sets prices per site and by time of day; see Tesla Supercharging support. Checked Oct 23, 2026.
- Gas price: AAA national average for regular, $4.29 per gallon ($4.2926) as of 10/23/26, gasprices.aaa.com.
- Gas car MPG: 28 MPG is an editable example for a typical gas car.
FAQ
Multiply the miles you drive by your car's energy use and your electricity rate. A 2026 Model Y Premium AWD is EPA-rated at 27 kWh per 100 miles, so 1,000 miles uses about 270 kWh. At the U.S. average residential rate of about $0.18 per kWh (EIA, August 2026), that is roughly $49 a month. Your own rate and driving will change the result.
Usually, yes. Supercharger prices vary by location and time of day and are shown in the car and the Tesla app before you plug in. Recent U.S. averages for Tesla drivers have been in the low 40 cents per kWh range, more than double the average home electricity rate, which is why most owners do most of their charging at home.
Yes. The EPA figures on fueleconomy.gov are based on the electricity drawn from the wall, so they already include typical charging losses. Real-world use rises in cold weather, at highway speeds and with larger wheels.
Check your utility bill for the price per kWh, including delivery charges. If you are on a time-of-use plan, use your off-peak rate if you schedule charging overnight.
No. The calculator gives estimates from the numbers you enter. Weather, speed, tire choice, preconditioning, local prices and fees all affect what you actually pay.
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