The plain-English definition
Your carbon footprint is the sum of every greenhouse gas your lifestyle puts into the atmosphere, converted into one unit: kilograms of CO₂-equivalent (CO₂e). CO₂e bundles methane, nitrous oxide and other gases into the same scale as carbon dioxide, weighted by how much warming each causes.
Most people's footprints come from four buckets: home energy (electricity and heating), transport (cars and flights), food (especially red meat and dairy) and stuff (clothes, electronics, services).
What goes into the number
- Direct emissions — fuel you burn yourself: petrol in your car, gas in your boiler.
- Indirect emissions from energy — the electricity you use, weighted by how clean your country's grid is.
- Embedded emissions — the carbon released to grow your food, build your car, or stitch your clothes.
How big is the average carbon footprint?
Personal-lifestyle averages, drawn from each country's national greenhouse-gas inventory:
- 🇬🇧 United Kingdom — about 8.5 t CO₂e / year (DEFRA)
- 🇺🇸 United States — about 13 t CO₂e / year (EPA)
- 🇩🇪 Germany — about 9 t CO₂e / year (Umweltbundesamt)
- 🇫🇷 France — about 7 t CO₂e / year (ADEME)
- 🇪🇸 Spain — about 6 t CO₂e / year (MITECO)
- 🇲🇽 Mexico — about 4 t CO₂e / year (INECC)
Why measuring matters
You cannot reduce what you do not measure. Putting a number on your footprint surfaces the two or three choices that actually move the needle — usually flights, the family car, and red meat — instead of guilt about plastic straws. Our free carbon footprint calculator turns four quick questions into your personal number, and the carbon footprint tracker lets you watch it move as you change habits.