How the calculation works
Electricity CO2 = kWh × 12 × grid factor. Car CO2 = distance × 12 ÷ km per litre × 2.3. Flights are estimated at about 200 kg each.
Frequently asked questions
What is missing?
Food, cooking gas, shopping and public transport are not included.
How can I cut my footprint?
Start with your biggest line: electricity, car use or flights.