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).
These greenhouse gas conversion factors should be used alongside guidance on how to measure and report your greenhouse gas emissions to help you measure and report on the greenhouse emissions that your organisation is responsible for.
Please note that the 2009 Defra / DECC Greenhouse Gas (GHG) Conversion Factors for Company Reporting were updated on the 30th of September, 2009 to take account of responses from consultees during the consultation on ‘draft guidance on how to measure and report your greenhouse gas emissions’. This includes amendments to Annex 3, Annex 9, and the addition of Annex 13.
Current GHG conversion factors - updated September 2009
- Guidelines to Defra / DECC’s Greenhouse Gas Conversion Factors for Company Reporting (Excel 830 KB)
- Guidelines to Defra / DECC’s Greenhouse Gas Conversion Factors for Company Reporting (PDF 100 KB)
Older GHG conversion factors
Greenhouse Gas (GHG) conversion factor methodology papers
- For further explanation on how these emission factors have been derived, please refer to the GHG conversion factor methodology papers
Page last modified: 30 September 2009