Government conversion factors for company reporting of greenhouse gas emissions

The government conversion factors for greenhouse gas reporting are for use by UK and international organisations to report on greenhouse gas emissions.

In order to report the greenhouse gas emissions associated with an organisation’s activities, the carbon emissions need to be converted into ‘activity data’ such as:

  • distance travelled
  • litres of fuel used
  • tonnes of waste disposed

The conversion factor spreadsheets provide the values to be used for such conversions, and step by step guidance on how to use them.

We produce a new set of conversion factors each year, together with a methodology paper explaining how the conversion factors are derived, and a paper explaining the major changes in the latest year’s factors.

Annual conversion factor publications

Published 1 May 2013
Last updated 22 June 2022 + show all updates
  1. Greenhouse gas reporting: conversion factors 2022 added.

  2. Greenhouse gas reporting: conversion factors 2021 added.

  3. Greenhouse gas reporting: conversion factors 2020 added.

  4. Conversion factors 2019 added.

  5. Greenhouse gas reporting: conversion factors 2018 published.

  6. 2017 conversion factors published.

  7. Latest conversion factors for 2016 published

  8. updated with rest of content from earlier non site

  9. First published.