Conversion factors - energy and carbon conversion guide

Our conversion factors guide can help you calculate your organisation’s carbon emissions and offers guidance on how to convert energy use and carbon emissions into common units. 

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This guide and interactive spreadsheet provides a number of useful conversion factors to help you calculate energy consumption in common units and to work out the greenhouse gas emissions associated with energy use.  

Calculating your energy use and carbon emissions can be useful for monitoring energy use internally within a business, and also for public reporting of energy consumption and carbon emissions.


  • Introduction to greenhouse gas conversions
  • Conversion factors for energy units
  • Fuel/energy conversion factors
  • Passenger transport conversion factors (car, bus, rail and air)
  • Heat content of fuels
  • Energy conversion factors
  • Passenger transport conversion factors
  • Heat content of fuels

Published: November 2016
Publication code: CTL153

The 2016 version of this guide is based on UK data published by Defra in September 2016.

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