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Government emission conversion factors for greenhouse gas company reporting

The government conversion factors for greenhouse gas reporting are suitable for use by UK based organisations of all sizes, and for international organisations reporting on UK operations.

In order to report the greenhouse gas emissions associated with an organisation’s activities, users must convert ‘activity data’ such as distance travelled, litres of fuel used or tonnes of waste disposed into carbon emissions. These conversion factors spreadsheets provide the values that should be used for such conversions and provide step by step guidance on how to use the factors.

We produce a new set of conversion factors each year and the factors can be downloaded in 3 separate formats. These formats are described here and we recommend the condensed set for most users:

  • Condensed set: This set of factors contains those most frequently requested by users, and is recommended for most users. It provides an abridged version of the full set of factors, designed to reduce the volume of information users need to navigate through to find the factors they want.

  • Full set: This set of factors contains all of the available factors for the selected year and is recommended for advanced users due to the volume of information presented. This set is available for all years from 2002, however 2002-2011 contain only electricity and heat & steam conversion factors; 2012 sets onward contain all emissions sources.

  • Flat file set: This contains the same information as the full set, but arranged for automated processes. It is only available from 2014 onwards. Not recommended for most users.

We also provide a methodology paper each year from 2012 onwards, explaining how the conversion factors are derived.

For new users of the conversion factors, we recommend that you should download the condensed set of conversion factors from the latest available year and read the guidance in the introductory sheet. Then follow the informative text at the top of each conversion factor tab in the output files. We also recommend reading guidance on emissions reporting such as Defra’s Environmental reporting guidelines. Then download the latest version of the condensed factor set.

For repeat users of the conversion factors we suggest that you download your preferred factor set and read the ‘what’s new’ sheet before using the conversion factors. This sheet highlights the most significant changes to the conversion factors made in this update. Following the ‘what’s new’ guidance will ensure that reporting is consistent and comparable year-on-year.

Conversion factors 2018

  1. Greenhouse gas reporting: conversion factors 2018

Conversion factors 2017

  1. Greenhouse gas reporting: conversion factors 2017

Conversion factors 2016

  1. Greenhouse gas reporting - Conversion factors 2016

Conversion factors 2015

  1. Greenhouse gas reporting - Conversion factors 2015

Conversion factors 2014

  1. Greenhouse gas reporting - Conversion factors 2014

Conversion factors 2013

  1. Greenhouse gas reporting - Conversion factors 2013

Conversion factors 2012

  1. Greenhouse gas reporting - Conversion factors 2012

Conversion factors 2011

  1. Greenhouse gas reporting - Conversion factors 2011

Conversion factors 2010

  1. Greenhouse gas reporting - Conversion factors 2010

Conversion factors 2009

  1. Greenhouse gas reporting - Conversion factors 2009

Conversion factors 2008

  1. Greenhouse gas reporting - Conversion factors 2008

Conversion factors 2007

  1. Greenhouse gas reporting - Conversion factors 2007

Conversion factors 2006

  1. Greenhouse gas reporting - Conversion factors 2006

Conversion factors 2005

  1. Greenhouse gas reporting - Conversion factors 2005

Conversion factors 2004

  1. Greenhouse gas reporting - Conversion factors 2004

Conversion factors 2003

  1. Greenhouse gas reporting - Conversion factors 2003

Conversion factors 2002

  1. Greenhouse gas reporting - Conversion factors 2002
Published 1 May 2013
Last updated 8 June 2018 + show all updates
  1. Greenhouse gas reporting: conversion factors 2018 published.
  2. 2017 conversion factors published.
  3. Latest conversion factors for 2016 published
  4. updated with rest of content from earlier non gov.uk site
  5. First published.