Carbon Footprint Calculator
A carbon footprint is the total greenhouse gas emissions caused by an individual, organisation, event, or product, expressed in tonnes of CO₂-equivalent (tCO₂e). The global average is ~4.7 tonnes per person per year; the UK average is ~5.5 tonnes; the US average is ~14 tonnes.
- 1Identify emission sources: travel, home energy, diet, shopping, flights
- 2Apply emission factors (kg CO₂e per unit): e.g., petrol car ≈ 0.21 kg CO₂/km
- 3Sum all categories to get total annual emissions in tonnes CO₂e
- 4Flights are a major contributor: a return flight London–New York ≈ 1.7 tCO₂e
UK average person=~5.5 tonnes CO₂e/yearAcross travel, home, diet, and consumption
Single short-haul return flight=~0.4 tCO₂eLondon–Barcelona (2,200km roundtrip)
Average UK home gas heating=~2.3 tonnes CO₂e/yearBiggest category for many UK households
| Country | Total | Transport | Food |
|---|---|---|---|
| USA | 14.2 | 4.1 | 2.1 |
| Australia | 14.7 | 3.8 | 2.0 |
| UK | 5.5 | 1.6 | 1.4 |
| Germany | 7.9 | 2.0 | 1.5 |
| India | 1.9 | 0.3 | 0.7 |
| World average | 4.7 | 1.2 | 1.0 |
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