EV calculator
What will it really cost to drive?
Compare electric, plug-in hybrid, and gas cars on yearly running cost and CO2 — adjusted for how your state's climate affects battery range and how clean its power grid is.
Vehicles to compare
Search 2,398 model year 2025–2026 cars, SUVs, and trucks from the EPA.
Running cost by month
Batteries lose range in the cold, so EVs cost more to run in winter. Gas costs stay flat.
How far will an EV go through the year?
Enter an EV's EPA-rated range to see what to expect each month in .
Average dayDaytime highOvernight low
Month-by-month table
How this is calculated
- Climate. Each month's range is taken as a share of the EPA rating at that month's normal temperature. The curve comes from real-world Nissan LEAF data: range falls in the cold (cabin heating, battery chemistry) and on very hot days (air conditioning). Energy use per mile rises in proportion.
- Electric cars. kWh per mile comes from the EPA combined MPGe (33.7 kWh = 1 gallon equivalent). EPA figures are measured at the wall, so charging losses are included.
- Plug-in hybrids split your miles between electric and gas driving using the share you set. Electric efficiency is derived from EPA composite MPGe; gas driving uses EPA gas-only MPG and 8,887 g of CO2 per gallon.
- Gas cars use EPA combined MPG and tailpipe CO2. Temperature isn't applied.
- Grid CO2 is your state's 2024 average. Emissions from building the car and its battery aren't included.
- Prices default to your state's average residential electricity rate and regular gas price. Enter your own utility rate (or public charging price) and local gas price for a closer estimate.
Data sources
- Vehicles: U.S. DOE / EPA, fueleconomy.gov model year 2025 and 2026 data.
- Temperatures: NOAA NCEI 1991–2020 monthly normals for one representative city per state.
- Electricity prices: U.S. EIA Electric Power Monthly, average residential price, January–June 2026.
- Gas prices: AAA state averages for regular unleaded, 9/22/26.
- Grid emissions: U.S. EIA state electricity profiles, 2024.
- Range vs. temperature: The Chart Nissan LEAF average range as a function temperature/Data from Fleet Carma via “Effects of Regional Temperature on Electric Vehicle Efficiency, Range, and Emissions in the United States” from the article by David Reichmuth “Do Electric Cars Work in Cold Weather? Get the Facts…”, February 16, 2016, The Equation, Union of Concerned Scientists, https://blog.ucs.org/dave-reichmuth/electric-cars-cold-weather-temperatures/
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