Gas to Electric CO2 Savings Calculator

Switching from a gas-powered car to an electric vehicle reduces CO₂ emissions, but the actual savings depend on where you live and how you drive — the Gas to Electric CO2 Savings Calculator puts a real number on that difference. Enter your ZIP code, annual miles driven, gas vehicle MPG, and EV efficiency, then select your electricity source to see your annual CO₂ savings. Secondary outputs include your gas vehicle's annual emissions vs. your EV's, the overall emission reduction percentage, and the equivalent number of trees that would need to be planted to offset the same amount of carbon.

Required for regional electricity emission factors

miles
mpg

Average fuel efficiency of your current gas vehicle

miles/kWh

Electric vehicle efficiency rating

Results

Annual CO₂ Savings

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Gas Vehicle Annual Emissions

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EV Annual Emissions

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Emission Reduction

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Equivalent Trees Planted

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Frequently Asked Questions

What is the difference between tailpipe and upstream emissions?

Tailpipe emissions are the greenhouse gases your car produces when driving. Upstream emissions are the GHGs associated with the production and distribution of gasoline and electricity used to power the vehicle.

Why does my ZIP code matter for EV emissions?

GHG emissions vary by region based on how electricity is produced. For example, electricity from coal results in higher emissions than electricity from renewable sources like wind or solar.

How accurate are these CO₂ savings calculations?

The calculations use EPA emission factors and regional electricity grid data to provide realistic estimates. Actual savings may vary based on driving patterns, vehicle efficiency, and local electricity sources.

What factors affect electric vehicle emissions?

EV emissions depend primarily on how the electricity is generated in your region, the efficiency of the electric vehicle, and your driving patterns. Areas with cleaner electricity grids show greater emission reductions.

How much can switching to an EV reduce my carbon footprint?

Most drivers can reduce transportation emissions by 50-80% by switching to an EV, even accounting for electricity generation. The exact reduction depends on your current vehicle's efficiency and local electricity sources.

Do electric vehicles really have zero emissions?

EVs have zero tailpipe emissions but do have upstream emissions from electricity generation. However, they typically produce significantly fewer total emissions than gas vehicles, especially as the electrical grid becomes cleaner.

What is considered a typical annual mileage for calculations?

The average American drives about 12,000 miles per year. However, you can adjust this number based on your actual driving habits for more accurate CO₂ savings estimates.

How do I find my vehicle's actual MPG?

You can find your vehicle's EPA-estimated MPG on the fuel economy sticker or by visiting fueleconomy.gov. For more accuracy, calculate your actual MPG by dividing miles driven by gallons used over several fill-ups.