Official data
Emission factors, explained
An emission factor converts an everyday quantity — a kWh of electricity, a kilometre flown, a kilogram of beef — into kilograms of CO2e. These pages publish the official figures BlocCarbon calculates with, straight from the UK DESNZ 2026 conversion factors, Agribalyse (ADEME/INRAE) and The Big Climate Database (CONCITO), each with context and worked examples. See our methodology for how factor sets are versioned.
Energy
Travel
- National rail travelkgCO2e per passenger-km
- London UndergroundkgCO2e per passenger-km
- Local bus travelkgCO2e per passenger-km
- Coach travelkgCO2e per passenger-km
- Taxi journeyskgCO2e per passenger-km
- Average carkgCO2e per km
- Domestic flights (UK)kgCO2e per passenger-km (with RF)
- Short-haul flights (economy)kgCO2e per passenger-km (with RF)
- Long-haul flights (economy)kgCO2e per passenger-km (with RF)
- Motorbike travelkgCO2e per km
- Ferry travel (foot passenger)kgCO2e per passenger-km
- Electric car (battery EV)kgCO2e per km
- Small carkgCO2e per km
- Large car / SUVkgCO2e per km
- International flights (non-UK legs, economy)kgCO2e per passenger-km (with RF)
- Business-class flights (long-haul)kgCO2e per passenger-km (with RF)
Hotels
- UK hotel nightkgCO2e per room-night
- France hotel nightkgCO2e per room-night
- Switzerland hotel nightkgCO2e per room-night
- Spain hotel nightkgCO2e per room-night
- Portugal hotel nightkgCO2e per room-night
- Germany hotel nightkgCO2e per room-night
- Italy hotel nightkgCO2e per room-night
- Netherlands hotel nightkgCO2e per room-night
- United States hotel nightkgCO2e per room-night
- Australia hotel nightkgCO2e per room-night
- China hotel nightkgCO2e per room-night
- India hotel nightkgCO2e per room-night
- UAE hotel nightkgCO2e per room-night
Food
- BeefkgCO2e per kg
- ChickenkgCO2e per kg
- CheesekgCO2e per kg
- SalmonkgCO2e per kg
- MilkkgCO2e per kg
- BreadkgCO2e per kg
- TomatoeskgCO2e per kg
- LentilskgCO2e per kg
- LambkgCO2e per kg
- PorkkgCO2e per kg
- EggskgCO2e per kg
- ButterkgCO2e per kg
- YogurtkgCO2e per kg
- TofukgCO2e per kg
- PrawnskgCO2e per kg
- PastakgCO2e per kg
- RicekgCO2e per kg
- PotatoeskgCO2e per kg
- CoffeekgCO2e per kg
- Dark chocolatekgCO2e per kg
- BananaskgCO2e per kg
- AppleskgCO2e per kg
- BeerkgCO2e per kg (about one litre)
- Red winekgCO2e per kg (about one litre)
- White winekgCO2e per kg (about one litre)
- Oat drinkkgCO2e per kg (about one litre)
- Soy drinkkgCO2e per kg (about one litre)
- TunakgCO2e per kg
Freight
Materials & waste
- Clothing (new textiles)kgCO2e per tonne of new clothing
- Glass (new)kgCO2e per tonne of new glass
- Aluminium cans and foilkgCO2e per tonne (primary production)
- PET plastickgCO2e per tonne (incl. forming)
- ConcretekgCO2e per tonne
- BrickskgCO2e per tonne
- Household waste to landfillkgCO2e per tonne landfilled
- Food waste to landfillkgCO2e per tonne landfilled
- Paper & card recyclingkgCO2e per tonne recycled