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 March 2026. The US average is 18.56¢/kWh. We plan to refresh these monthly from the EIA API.

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. Defaults: 30 mpg and $3.9 per gallon (US average regular gasoline, EIA/AAA). 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.