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Greenhouse Gas Equivalencies Calculator

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Last Updated: March 2021

Did you ever wonder what reducing carbon dioxide (CO2) emissions by 1 million metric tons means in everyday terms? The greenhouse gas equivalencies calculator can help you understand just that, translating abstract measurements into concrete terms you can understand, such as the annual emissions from cars, households, or power plants.

This calculator may be useful in communicating your greenhouse gas reduction strategy, reduction targets, or other initiatives aimed at reducing greenhouse gas emissions.

Please note that these estimates are approximate and intended for communication purposes. They should not be used for emission inventories, formal carbon footprints, or formal emissions analysis. See Other Resources for additional tools that EPA maintains for emissions analysis and Other Calculators for additional calculators that EPA maintains.

Enter Your Data

There are two options for entering data into this calculator to develop greenhouse gas equivalencies. When you enter energy data, the calculator converts your entered values to carbon dioxide-equivalent greenhouse gas emissions based on emission factors for energy consumption or electricity reductions. It then displays equivalent ways to express those emissions. When you enter emissions data, the calculator displays equivalent ways to express those emissions. For additional information, see the equations and sources used for this calculator on the Calculations and References page.

Print Your Results

? Click Here for Calculations and References

Amount Unit Gas
CO2 - Carbon Dioxide or CO2 Equivalent*
Carbon or Carbon Equivalent
CH4 - Methane
N2O - Nitrous Oxide
- Hydrofluorocarbon gases 
- Perfluorocarbon gases
SF6 - Sulfur Hexafluoride

*If your estimated emissions of methane, nitrous oxide, or other non-CO2 gases are already expressed in CO2 equivalent or carbon equivalent, please enter your figures in the row for CO2 or carbon equivalent.

**This calculator uses an eGRID non-baseload national average emissions rate when calculating “kilowatt-hours of electricity” to “carbon dioxide equivalent.”

Other Calculators

There are other EPA calculators that can estimate greenhouse gas emission reductions for

For basic information and details on greenhouse gas emissions, visit the Emissions section of EPA’s climate change site.