MYC GHG Emissions Calculator

From Communauté de la Fabrique des Mobilités

A tool to quantify urban mobility GHG emissions

Screenshot from 2023-10-31 17-24-03.png


MYC Emissions Calculator is an open source online tool that calculates GHG emissions induced by the transport activity on a given territory (city or country scale).

It relies on the excel-based calculator created by the Institute for Energy and Environmental Research in cooperation with the German and French development agencies GIZ and AFD, for the MobiliseYourCity partnership.

It helps developing countries and cities calculating transport GHG emissions for a "reference year" (when you start the calculation).

In addition, it models a "Business-as-usual scenario (BAU)" : if no actions is taken and considering the expected growth of the population and trips, what can we expect from GHG emissions about 30 years after. That scenario is to be compared with a "climate scenario" with emission reductions from mitigation measures.


FabMob is working on the transformation of the excel-based calculator into the online tool, step by step in order to make it a digital common, easy to access and easy to use for a community.

You can read our first scoping note after analyzing the excel-based tool :


An MVP has been defined during the first quarter of 2022, the web version began by focusing on:

  • Targeted at consulting firms helping cities (not countries)
  • Focused on GHG estimation for BAU (First sheet, 1A)
  • Focused on passengers (no freight)

With the following features:

  • Select country/city and reference year
  • Create used accounts to specify profile type, save and track data
  • Proper presentation of the tool
  • A welcome page, with description of the tool, its goals and its relation to MYC
  • Compute GHG emissions (using the ASIF methodology) with the following parameters:
    • Vehicules-kilometers travelled (vkt)
    • Occupancy and average trip length per vehicle type
    • Vkt per fuel type
    • Average energy consumption and energy efficiency
    • CO2 impact of electricity
  • Improve the way data is filled
    • Progress bar to track data collection journey
    • Help in the choice of category of transport
    • Guide users in their inputs
    • Add a contact email or a way of reaching the MYC team
  • Predict emissions increase based on economic and travel growth between now and 2050 if nothing is done (Business As Usual)
  • Visualize output data as graphs
  • Ease the understanding of computations


In 2023, the version MVP2 was released, complementing the scope to match the functionalities of the excel spreadsheet. The following features were included:

  • Complete rework of the Inventory & BAU steps described in the first MVP. A project is now divided in three steps
    1. An inventory, focused only on the reference year. This is where vehicles and fuels are defined
    2. A Business as Usual (BAU) scenario, built on top of the inventory
    3. One or more Climate scenarios, to be compared to the BAU
    • Each step includes a small results page, to identify potential problems in data
  • Full rework of the User Interface
  • Match the features of the latest version of the offline tool (excel)
    • This includes an update on computation methods, filling option, new types of fuels such as hydrogen and an update of default emission factors
  • Creation of an educational path based on the MYC guides and notes from the Excel tool, including:
    • Explanatory and illustrated texts of various calculation methods
      Myc 1.png
    • Description of the required data for each step
      Myc 2.png
    • Detailed tooltips for each parameter
      Myc 3.png
    • Concise formulas for intermediate calculations
      Myc 4.png
    • Guidance on how data can be filled
  • Addition of a source entry and management system for each data point
  • Addition of a note-taking field on each page, providing a space to summarize assumptions and back-of-the-envelope calculations
    Myc 5.png
  • Unlike MVP1, the tool now supports the input of climate scenarios, with or without prior calculations
    Myc 6.png
  • Addition of a page for comparing different scenarios
    • This page contains a set of configurable graphs, exportable as PNG images or CSV files
      Myc 7.png
    • It also includes a summary of the sources used in the project
    • Finally, it allows for downloading all data entered into the tool in CSV format. This export facilitates the transition from the online tool to Excel if necessary
  • Similar to MVP1, a project can be "validated", making it visible to other users
  • Unlike MVP1, population and GDP data have been removed since they are not used in emissions calculations

Version 2.1 - Community Edition

2023 also includes the release of the version 2.1 - Community Edition, built with volunteer work from various contributors

  • Redesign of the tool's introduction page, now more visually appealing
    Myc 8.png
  • Addition of new illustrations, icons, and a typeface in line with the MYC graphic design
    Myc 9.png
  • Significant work has been done to standardize all interface pages, accompanied by various visual enhancements
    • For example, uniform cell sizes in tables and improved handling of text and number overflows have been implemented
      Myc 10.png
  • These improvements affect all visible pages, as well as dynamic elements like tooltips and popups
    Myc 11.png
  • In addition to numerous interface changes, a few bugs have been fixed:
    • Added support for HTTPS for a more secure browsing experience
    • Fixed a bug that prevented project creation under certain conditions
    • Corrected an incorrect vkt calculation based on the order of inventory filling in "fleet" mode
    • Fixed project deletion

Organizations using or interested in using the resource: AFD, Cetud

Contributor(s): Alex Bourreau, Adrien Bihorel, Ferdinand Barbier

Tags: international, GHG, cities, countries, Collectivité, FabMob2022, FabMob2023

Categories: Logiciel, Données, Connaissance, Communauté

Theme: Urbanisme et ville, Logiciel Libre, Collectivité, Africa

Referent: Alex Bourreau

Challenge: Accompagner une collectivité à ouvrir un maximum de ressources et construire un kit d'aide à l'innovation, Faciliter le partage la gestion la maintenance la comptabilité des émissions polluantes et de GES des véhicules

Key people to solicit:

Other related common:

Wealth sought:

Required skills:

Community of interest: Communauté des acteurs en Afrique

License: CC BY-NC-SA 4.0, MIT Licence

Terms of Service (TOS):

Level of development: POC et 1er client

Link to my actions board:

Link to my cloud, wiki, drive…:


Next step:

Documentation of the experimentations:

Other informations

List of the actors using or willing of using this common: aucun pour le moment

List of the workshop reports related to this common:

Complementary information on the project[edit | edit source]

1. GHG emissions calculator[edit | edit source]

The excel-based tool is built around 12 tabs :

  1. Introducing the tool
    • Get started
  2. Filling out the inputs and visualizing the results
    • 1A. Input base and BAU
      Tab 1A Input Base and BAU
    • 1B Top-Down Validation
    • 2A Input Climate Scenario for Passengers
    • 2B Input Climate Scenario for Freight
    • 3. Overview of results
  3. Tabs for intern calculation
    • 4A. Calculation BAU
    • 4B. Calculation Climate Scenario
  4. Complementary data
    • 5. Defaults values
    • 6 Defaults parameters
  5. Sources and abbreviations
  6. Referencing

2. MobiliseYourCity partnership & GHG emissions calculation methodology[edit | edit source]

MobiliseYourCity is an international partnership whose main activity is the development of Sustainable Urban Mobility Plans (SUMP) and National Urban Mobility Policy/Investment Programmes (NUMP). Its methodology is characterised by its very operational aspect (these plans serve as project preparation to raise funds for implementation) and the focus is on data collection, scenario modelling and quantification of impacts on the Sustainable Development Goals.

In the frame of climate-related initiatives funded by donors internationally, one of the main issues is to measure GHG emissions to be able to account for the mitigation impact of the projects. It is the case for instance in many urban mobility-related programmes and projects, of which the MobiliseYourCity (MYC) initiative is an example, where GHG emissions are a major indicator developed according to the MRV (Measure-Report-Verify) approach.

There are several ways to calculate GHG from urban mobility. The ASIF methodology seems to be the most appropriate within the MYC context (where GHG emissions are one key element of the Sustainable Urban Mobility Plan), requiring Vehicles Kilometres Travelled (VKT) and average fuel economy (FE) of each vehicle type.

The ASIF methodology: the most common way to reach MRV for the transport sector[edit | edit source]

The ASIF approach is widely used by many stakeholders to quantify energy use and GHG emissions from the transport sector. The main components are traffic activity (VKT) and GHG emission factors (blue squares in the figure below).

The ASIF framework to calculate GHG emissions from the transport sector (MYC, 2017)

There are three main ways for getting the average fuel economy of the vehicle fleets in cities:

  • Performing a survey towards vehicle users to require their declared fuel economy; such declared values need quite a large sample for each vehicle type considered to get an accurate value;
  • Using an emissions inventory harmonized tool that derives average FE (Fuel Economy) from laboratory measurements on typical driving conditions for each vehicle type;
  • Producing data with specific app like GECO Air or devices.

Each methodological approach have their own advantages and drawbacks (Table 1).

CO2 emission factors from : Pros Cons
Fuel Economy Survey - More realistic value matching local context

- Getting technical information about vehicle fleet simultaneously

- Declared values

- Large sample needed for each vehicle type to get good accuracy

- Timescale to get results

- Surveys are expensive

Emission Inventory Tool - Real CO2 measurements

- Robust "MRV-compatible" methodology

- Allows for future projections for certain tools

- Incentive for all MYC countries/cities to collect the same information

- Pollutants also included

- Comparability across MYC countries/cities

- Requires the technical specifications of the vehicle fleet

- Cost of using the tool when it comes with proprietary rights

- Need of additional information about average speeds or level of congestion

Table 1 : Pros and cons of surveys and IT tool to get CO2 emission factors

This note focuses on the pros and cons of getting fuel economy information by using an emission inventory tool.

Why a harmonized tool ?[edit | edit source]

Using an emission inventory tool to convert VKT into CO2 brings several benefits compared with getting fuel economy values from a survey (see table 1).

There would be a need to be able to gauge and compare the efforts made by each country/city, check the transparency of each results put forward and assess the quality of the efforts made to mitigate GHG emissions.

For example, if a country states 100 MtCO2 saved and another 300 MtCO2 saved, a robust approach requires that the country saving 300 MtCO2 really saved 3 times more than the other country. A harmonized methodological approach would make sure this is possible. If each country develops its own inventory tool to quantify national GHG emissions from the urban transport sector, there is a high risk that the results obtained will not be comparable with the results from other tools. The essence of MRV procedure, making sure that results are harmonized and comparable, would then be missed.

By having a harmonized GHG quantification tool, one would make sure that methodologies and results would be more transparent and more easily comparable. It would also provide a strong incentive to collect the same information in all countries/cities engaged in clean urban transportation strategies and projects, which will be useful to characterize the urban transport sector and calculate GHG emissions.

Hence the recommendation to either adapting an existing tool or creating one adapted to developing countries context. Training would be provided by the tool editor and detailed user guide would be available

Are other tools available?[edit | edit source]

As detailed in ADEME’s report on MRV-GHG strategies for Morocco, a short list of potential tools has been put forward that would fit for these purposes. Such a harmonized GHG tool should build on on the most adequate tools that are widely used across Europe to perform transport emission inventories:

Other institutes like IFEU (Institut für Energie- und Umweltforschung), could also be considered.

GIZ has already delivered a version of HBEFA to perform GHG emission inventories in Chinese cities. A slightly modified version of this tool would potentially be usable within other geographies.

As per COPERT, it is widely used by many stakeholders at the national and local levels, as it is freely available and all emission factors calculation equations are publically available.

Being widely used for emission inventories, such tools would qualify for MRV compatible strategies.

Abbreviations[edit | edit source]

ADEME Agence de l’Environnement et de la Maîtrise de l’Énergie
ASIF Activity Structure Intensity Fuel
CO2 Carbon dioxyde
FE Fuel Economy
GHG Greenhouse gas
MRV Measurement, Reporting and Verification
MRV-GHG Measurement, Reporting and Verification for greenhouse gas
MYC MobiliseYourCity
NAMA Nationally Appropriate Mitigation Action
NUMP National Urban Mobility Planning
SUMP Sustainable Urban Mobility Plan (PDU)
VKT Vehicle kilometres travelled