A carbon footprint is measured in tonnes of carbon dioxide equivalent (tCO2e). The carbon dioxide equivalent (CO2e) allows the different greenhouse gases to be compared on a like-for-like basis relative to one unit of CO2. CO2e is calculated by multiplying the emissions of each of the six greenhouse gases by its 100 year global warming potential (GWP).
A carbon footprint considers all six of the Kyoto Protocol greenhouse gases: Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs) and Sulphur hexafluoride (SF6).
Types of carbon footprinting
The main types of carbon footprint for organisations are:
- Organisational carbon footprint
Emissions from all the activities across an organisation, including buildings' energy use, industrial processes and company vehicles.
- Value chain carbon footprint
Includes emissions which are outside an organisation's own operations (also known as Scope 3 emissions). This represents emissions from both suppliers and consumers, including all use and end of life emissions.
Emissions over the whole life of a product or service, from the extraction of raw materials and manufacturing right through to its use and final reuse, recycling or disposal.
Calculate your carbon footprint
Our carbon footprinting overview guide explains what is included in organisational and product footprints, how you can measure and communicate them, and the benefits of doing so. We also set out the specific steps you need to take to calculate your carbon footprint(s), and some of the key things to consider if you do.
Download Carbon Footprinting overview (CTV043)
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Greenhouse gas conversion factors are used to calculate the amount of greenhouse gas emissions caused by energy use. Our conversion factors guide contains these factors along with a spreadsheet to enter your usage and calculate carbon emissions.