Greenhouse gas reporting: conversion factors 2023
These emission conversion factors are for use by UK and international organisations to report on 2023 greenhouse gas emissions.
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Update: June 2023
Due to a minor error in the version published earlier this month, we have updated a small number of factors for Passenger Vehicles in the advanced set, condensed set, and flat file spreadsheets. These are the factors for cars (by size), using unknown fuels or plug-in hybrid EVs. Further details are in the relevant conversion factors spreadsheets.
There are 3 sets of conversion factors:
- condensed set: this abridged version of the full set is easiest to navigate and most frequently requested. Recommended for most, and new, users of conversion factors
- full set: contains all available factors for the selected year. Recommended for advanced users only due to the volume of information
- flat file set (only available from 2014): contains same data as the full set but designed for use in automated processes. Not recommended for most users
The methodology paper explains how the conversion factors are derived.
New users: read the introductory worksheet in the latest condensed set of conversion factors, and the guidance at the top of each individual worksheet.
Regular users: read the ‘what’s new’ sheet which highlights the significant changes for that update: this will ensure consistent and comparable reporting year-on-year.
Defra’s Environmental reporting guidelines provide more detail.
Last updated 28 June 2023 + show all updates
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Due to a minor error in the version published earlier this month, we have updated a small number of factors for Passenger Vehicles in the advanced set, condensed set, and flat file spreadsheets. These are the factors for cars (by size), using unknown fuels or plug-in hybrid EVs. Further details are in the relevant conversion factors spreadsheets.
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First published.