A carbon footprint measures the total greenhouse gas emissions caused directly and indirectly by a person, organisation, event or product.
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).
The main types of carbon footprint for organisations are:
Published January 2018
Our 27-page guide to carbon footprinting explains what is included in organisational, supply chain 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.
Publication date: January 2018; Publication code: CTV043 v3
Information in this guide was correct at the time of publication
Calculate your organisation's emissions with our Carbon Footprint Calculator.
Designed to help small and medium-sized organisations (SMEs) in the UK measure their corporate emission footprint following GHG Protocol Guidance, the calculator includes selected emission sources common to the majority of SMEs.
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.
For further support, find out more about our carbon footprinting services:
The Carbon Trust Green Business Fund offers energy efficiency support and energy assessments for small and medium-sized businesses in England, Scotland and Wales.
If you'd like to improve energy efficiency of your organisation, see our services for small to medium enterprises to find out how we can help.