Methodology

Every figure here is transparent and adjustable. Here is where the numbers come from.

Electricity prices

Average residential electricity price by state, from US Energy Information Administration, Electric Power Monthly, Table 5.6.A, data for July 2026. The US average is 18.31¢/kWh. Prices are pulled from the EIA Open Data API and refresh automatically every 14 days; the EIA publishes each month's figures about two months later.

Charging cost

Annual home-charging cost = miles per year × (kWh per 100 miles ÷ 100) × electricity price. Defaults: 13,600 miles a year (about the FHWA US average) and 30 kWh per 100 miles (a typical EV; the EPA range is roughly 25 to 35). This reflects home charging; public DC fast charging costs more.

Cost per 100 miles and gas-equivalent price

Cost per 100 miles = (kWh per 100 miles ÷ 100) × electricity price, so it does not depend on how much you drive. The gas-equivalent price (a revival of the US Department of Energy's retired “eGallon”) is what a gallon of driving costs on electricity: the energy to travel as far as one gallon of gas carries the comparison car, that is, cost per 100 miles × (MPG ÷ 100). Compare it directly to the pump price to see the real gap. Both refresh monthly with the EIA data.

Gas comparison

Annual gasoline cost = miles ÷ MPG × price per gallon, with a default of 30mpg. The price is the latest EIA weekly retail price for regular gasoline: the state's own figure for the 9 states the EIA publishes (CA, CO, FL, MA, MN, NY, OH, TX, WA), otherwise the EIA regional average for the state's PADD region (West Coast outside California for Arizona, Nevada and Oregon), and the US average for Alaska and Hawaii, which the EIA does not publish weekly. The latest US average is $4.47 a gallon (week of September 28, 2026). Source: US EIA, Weekly Retail Gasoline and Diesel Prices. Change any of these in the calculator for your own numbers.

Estimates for typical US driving, not a guarantee of your costs. Independent project, not affiliated with the EIA or any automaker.