Calculators / Footprint

Small business carbon footprint

Fill in what you know for one year and leave the rest blank. Each line uses the UK government's 2026 conversion factor, read from the reviewed library, and shows the row it comes from. Background: Scope 1, 2 and 3 explained.

Scope 1

Natural gas

From gas bills (gross calorific value). Factor 0.18231 kg CO₂e per kWh, DESNZ 2026 row 83. Full calculator

kWh

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Diesel in company vehicles

From fuel cards. Factor 2.58354 kg CO₂e per litre, DESNZ 2026 row 187. Full calculator

litres

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Petrol in company vehicles

From fuel cards. Factor 2.075 kg CO₂e per litre, DESNZ 2026 row 283. Full calculator

litres

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R410A refrigerant topped up

From air conditioning service records. Factor 1924 kg CO₂e per kg, DESNZ 2026 row 688. Full calculator

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Scope 2

Grid electricity (UK, location-based)

From electricity bills. Factor 0.13096 kg CO₂e per kWh, DESNZ 2026 row 3066. Full calculator

kWh

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Scope 3

Short-haul flights, economy (with RF)

Flights to and from the UK within Europe. Factor 0.12576 kg CO₂e per passenger-km, DESNZ 2026 row 4426. Full calculator

passenger-km

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Long-haul flights, economy (with RF)

Flights to and from the UK beyond Europe. Factor 0.11704 kg CO₂e per passenger-km, DESNZ 2026 row 4450. Full calculator

passenger-km

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National rail

Business trips by train. Factor 0.03092 kg CO₂e per passenger-km, DESNZ 2026 row 5461. Full calculator

passenger-km

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Employee cars on business (average car)

From mileage claims. Factor 0.16591 kg CO₂e per km, DESNZ 2026 row 5353. Full calculator

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Hotel nights (UK)

From travel bookings. Factor 10.4 kg CO₂e per room-night, DESNZ 2026 row 7395. Full calculator

room-nights

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Homeworking (equipment and heating)

Staff × home days × hours per day. Factor 0.32393 kg CO₂e per FTE hour, DESNZ 2026 row 8688. Full calculator

FTE hours

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Not included: upstream (well-to-tank) emissions, grid losses, purchased goods, freight, waste and water. Add them with the individual calculators. Flight factors include radiative forcing; see the business travel guide.