09 May 2020
The new updated OzonAction GWP-ODP Calculator Application

Data are extremely important for the Montreal Protocol community, and the data reporting formats for both A7 and CP* have changed recently, to a large degree triggered by the Kigali Amendment. HFCs, blends, CO2-equivalent values, etc. now have to be addressed much more frequently by Ozone Officers during their daily work. Sometimes the terminology and values are complex and can be confusing, and it helps to have  all the official facts and figures in one place. Conversion formulas need to be applied to calculate CO2-eq values from both ozone depleting potential (ODP) and metric tonne values.





This free app from OzonAction is a practical tool for Ozone Officers to help demystify some of this process and put frequently-needed information at their fingertips.

  • If you already have this application, ensure you have the updated version (the update should happen automatically)
  • If you have never used it before, please download it and give it a try.
  • If you speak French or Spanish, we have now made a version in your own language.





What’s new in the app:

  • An updated more user-friendly interface
  • Multilingual interface: English, French and Spanish
  • A new Kigali Amendment mode – in this mode the GWP values used to calculate the refrigerant blends/mixtures only include GWP contributions from components that are controlled HFCs
  • Latest updated ODP and GWP values from the recent reports from the Montreal Protocol technology and scientific expert panels as well as the Intergovernmental Panel on Climate Change (IPCC) reports
  • References added for sources of all values
  • New refrigerant mixtures (with ASHRAE -approved refrigerant designations)


The new and updated UNEP OzonAction GWP-ODP Calculator application will help you to convert between values in metric tonnes, ODP tonnes and CO2-equivalent tonnes of substances controlled by the Montreal Protocol and their alternatives.

This application, available at no cost, is particularly useful for National Ozone Officers to assist with understanding and calculating quantities of controlled substances, both pure substances and mixtures, for quota assignment, reporting requirements, etc. Other stakeholders interested in ODP and global warming potential (GWP values of controlled substances and their alternatives will also find this tool useful.

Operation of the application is very simple — just select a substance from the dropdown list and enter the known value in the appropriate field; the calculator will automatically perform the conversion between metric tonnes, ODP tonnes and/or CO2-equivalent tonnes and display the corresponding converted values. The ODP, GWP and information about the substance is provided. For mixtures, the components of the mixture and their relative proportions (metric, ODP, CO2– equivalent tonnes) are also calculated.


Watch the new short introductory tutorial video on GWP-ODP Calculator – available now on YouTube:




Smartphone Application: Just search for “GWP-ODP Calculator” or UNEP in the Google Play store or use the QR code – free to download!  (iOS version coming soon)




Desktop Application: GWP-ODP Calculator is also available online on the OzonAction website at: https://www.unenvironment.org/ozonaction/resources/gwp-odp-calculator/gwp-odp-calculator


For more information: https://www.unenvironment.org/ozonaction/resources/factsheet/gwp-odp-calculator-updated-and-improved

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