# GWP-ODP Calculator

> Converts ODP and GWP values for Montreal Protocol substances. (iPhone/iPad app by United Nations Environment Programme.)

- Source: https://appshunter.io/ios/app/gwp-odp-calculator/id1288285449 (this page in markdown: same URL + `.md`)
- Developer: [United Nations Environment Programme](https://appshunter.io/developer/1106793919)
- Category: Education
- Price: Free
- Age rating: 17+
- Requires: iOS 11.0 · 28 MB
- Languages: English
- Released: 2017-09-25
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gwp-odp-calculator/id1288285449/reviews.md

## What is GWP?

The UNEP OzonAction GWP-ODP Calculator app will help you to convert between values in metric tonnes, ODP tonnes and CO2-equivalent tonnes (or kg) of substances controlled by the Montreal Protocol and their alternatives. The updated application now includes a new Kigali Amendment mode. The app can now be used in two different modes: the regular "Actual Values" mode and the "Kigali Amendment" mode. In the Kigali Amendment mode, the global warming potential (GWP) values provided are those specified in the Kigali Amendment to the Montreal Protocol, i.e. GWP values are only assigned to controlled HFCs. In this mode the GWP values used to calculate the refrigerant blends/mixtures only include GWP contributions from components that are controlled HFCs. The user can effortlessly switch between modes. The OzonAction GWP-ODP Calculator uses standard ODP values and GWP values as specified in the text of the Montreal Protocol to make the conversions; other ozone depleting potential and global warming potential values from the recent reports from the Montreal Protocol technology and scientific expert panels as well as the Intergovernmental Panel on Climate Change (IPCC) are used when appropriate, with references to sources of all values used. The app includes new refrigerant mixtures (with ASHRAE approved refrigerant designations). The app can be viewed in English, French or Spanish.

For single component substances simply select a substance from the dropdown list and enter the known value in the appropriate field (e.g. a quantity in Metric tonnes). The calculator will automatically perform the conversion between metric tonnes, ODP tonnes and/or CO2-equivalent tonnes (or kg) and display the corresponding converted values. The ODP, GWP and description of substance are also provided.

For refrigerant mixtures/blends, simply select the name of the blend and enter the quantity. The calculator will display the corresponding total ODP tonnes and CO2- equivalent tonnes for that quantity of substance. The components of the mixture and their relative proportions (metric, ODP, CO2- equivalent) are also displayed. Both these types of calculations can be carried out in both the "Actual Values" mode and the "Kigali Amendment" mode.

This application is designed primarily for use by Montreal Protocol National Ozone Units and other related stakeholders. The application was produced by UN Environment Programme (UNEP) OzonAction as a tool principally for developing countries to assist them in meeting their reporting and other commitments under the Protocol and is part of the OzonAction work programme under the Multilateral Fund for the Implementation of the Montreal Protocol.

## Key features

- Converts metric tonnes, ODP tonnes, and CO2-equivalent tonnes
- Includes Kigali Amendment mode
- Supports 'Actual Values' and 'Kigali Amendment' modes
- Displays substance ODP, GWP, and description
- Calculates for single component substances and refrigerant mixtures
- Available in English, French, and Spanish

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/gwp-odp-calculator/id1288285449/reviews.md

### 5/5 — Expert

*2018-01-16*

This is the best app EVER! Download it now! It is so helpful, I use it all the time. This is better than any other app on the AppStore, SO DOWNLOAD NOW!

## Frequently asked questions about GWP

### What is the GWP-ODP Calculator used for?

The GWP-ODP Calculator is used to convert between metric tonnes, ODP tonnes, and CO2-equivalent tonnes for substances controlled by the Montreal Protocol. It helps users understand the environmental impact of different substances.

### Does GWP-ODP Calculator have different modes?

Yes, the GWP-ODP Calculator features two distinct modes: 'Actual Values' mode, which uses standard ODP and GWP values, and 'Kigali Amendment' mode, which incorporates GWP values specific to the Kigali Amendment.

### What languages does GWP-ODP Calculator support?

The GWP-ODP Calculator is available in English, French, and Spanish, making it accessible to a wider range of international users.

### Can GWP-ODP Calculator handle refrigerant mixtures?

Yes, the app can calculate ODP tonnes and CO2-equivalent tonnes for refrigerant mixtures/blends. It also displays the components of the mixture and their relative proportions.

### Is GWP-ODP Calculator suitable for offline use?

The provided data does not specify offline functionality. However, as a calculator tool, it is likely designed to perform calculations without requiring a constant internet connection once installed.

### What is the age rating for GWP-ODP Calculator?

GWP-ODP Calculator has an age rating of 17+. This is likely due to the technical nature of the data and its intended professional audience.

### How often is GWP-ODP Calculator updated?

The latest version, 2.2.0, was released on November 6, 2020. This indicates that updates may not be very frequent, but the app is maintained.

### Does GWP-ODP Calculator have ads?

No, GWP-ODP Calculator does not contain advertisements. It is a free application developed by the United Nations Environment Programme.

## Version history (last 2 releases)

### 2.2.0 — 2020-11-06

- 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. 
- English, French and Spanish interfaces
- The latest updated ozone depleting potential and global warming potential values 
- References to sources of all values used
- New refrigerant mixtures

### 1.0.0 — 2017-09-25

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*