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by European Commission Directorate
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Defra GreenHouse Gas (GHG) Conversion Factors

The purpose of the greenhouse gas (GHG) conversion factors is to help businesses convert existing data sources (e.g. utility bills, car mileage, refrigeration and fuel consumption) into CO2 equivalent emissions by applying relevant conversion factors (e.g. calorific values, emission factors, oxidation factors). 


Road transport emissions calculation tool and associated emission factors for the EU27, developed by the European Environment Agency (EEA), in the framework of the activities of the European Topic Centre for Air Pollution and Climate Change Mitigation.  Requires payment for access.


Finnish set of tools with emission factors developed by VTT, covering road rail air and maritime, and covering emissions forecasts out to 2031.  (Also available in english language.)


German handbook of road transport emission factors covering several European countries.  Requires payment for access.


Emission factors generated during the ARTEMIS project.  Potentially useful for non-road modes and manoeuvring at terminals.


GEMIS (Global Emissions Model for integrated Systems) is a public domain life-cycle and material flow analysis model and database that IINAS provides freely.  GEMIS consists of an analysis model to determine energy and material flows (including transports), and a database.  The analysis model calculates for processes and scenarios so-called life-cycles, i.e. it takes into account all processes from resource extraction (primary energy, raw materials) to final energy  or material use, and also includes auxiliary energy and material uses as well as materials for constructing energy, material and transport systems.  The GEMIS database offers information on: (fuel data, processes, materials, transport)GEMIS includes the total life-cycle in its calculation of impacts - i.e. fuel delivery, materials used for construction, waste treatment, and transports/auxiliaries. The GEMIS database covers for each process: (efficiency, air and GHG pollutants, solid wastes, liquid pollutants, land use) GEMIS can also analyze costs - the respective data are implemented for fuels and energy systems.  For more info see


International LCA database, based around global supply chains for many products.  The database contains international industrial life cycle inventory data on energy supply, resource extraction, material supply, chemicals, metals, agriculture, waste management services and transport services.  An example of the license costs from an example reseller can be found here.

GHG Reporting Database

The Climate Registry has launched the GHG Reporting Database, a free online tool that compares federal, regional and state greenhouse gas (GHG) reporting requirements. Funded by U.S. EPA, the database will help organizations navigate the patchwork of GHG regulations, for example the federal Greenhouse Gas Reporting Program (GHGRP), California's Mandatory Reporting Regulation (MRR), and state-by-state Regional Greenhouse Gas Initiative (RGGI) requirements.  More information can be found here.

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