Estimate your organisation's carbon footprint in a few minutes. Enter a year of energy, fuel, travel, water and waste figures and see your emissions by scope, your largest sources and your emissions per employee, using the UK government's 2026 conversion factors.
Why this matters. Customers, lenders and public sector buyers increasingly ask for a carbon footprint, and large companies must report energy and emissions under SECR. Most of the numbers you need are already on your bills.
Leave any field blank that does not apply. Treat the result as an estimate, not a verified footprint.
From your gas bills or supplier statements.
Oil delivered for heating during the year.
Bottled or bulk LPG for heating, cooking or forklifts.
Fuel bought on company cards or delivered to site.
Fuel bought on company cards for owned or leased vehicles.
From your electricity bills, across all sites.
Mileage claimed through expenses.
An estimate is fine.
Return trips within the UK.
Return trips to Europe and nearby destinations.
Return trips beyond Europe.
From your water bills.
From your waste contractor's reports.
Optional. Used to show emissions per employee.
Please enter at least one figure, such as your electricity or gas use.
This calculator covers the sources most organisations can measure in an afternoon. A footprint for SECR, a carbon reduction plan or a customer request also needs purchased goods and services, commuting and the other scope 3 categories. We can measure it properly and turn it into a costed reduction plan.
Book a confidential conversationFactors come from the UK government's greenhouse gas reporting conversion factors 2026. Electricity is location based. Flights use average passenger factors including radiative forcing, with typical return distances of 900 km domestic, 3,000 km short haul and 14,000 km long haul. Car mileage uses the average petrol car factor. This is a deliberately simple model.
From the UK government's greenhouse gas reporting conversion factors 2026.
| Source | Factor | Unit |
|---|---|---|
| Natural gas | 0.18231 | kgCO2e per kWh |
| Heating oil (kerosene) | 2.54016 | kgCO2e per litre |
| LPG | 1.55713 | kgCO2e per litre |
| Diesel, average biofuel blend | 2.58354 | kgCO2e per litre |
| Petrol, average biofuel blend | 2.075 | kgCO2e per litre |
| UK electricity, location based | 0.13096 | kgCO2e per kWh |
| Electricity network losses | 0.01299 | kgCO2e per kWh |
| Average petrol car | 0.16152 | kgCO2e per km |
| National rail | 0.03092 | kgCO2e per passenger km |
| Domestic flight, average passenger | 0.22928 | kgCO2e per passenger km |
| Short haul flight, average passenger | 0.12786 | kgCO2e per passenger km |
| Long haul flight, average passenger | 0.15282 | kgCO2e per passenger km |
| Water supply and treatment | 0.36218 | kgCO2e per cubic metre |
| Commercial waste to landfill | 520.58 | kgCO2e per tonne |
Collect a year of activity data, such as energy use, fuel, travel, water and waste, multiply each by the matching UK government conversion factor, and group the results into scope 1, scope 2 and scope 3.
The UK government's greenhouse gas reporting conversion factors, published each year by the Department for Energy Security and Net Zero. This calculator uses the 2026 set.
It covers the main energy and travel sources, but an SECR report also needs your actual energy use for the financial year, an intensity ratio, your methodology and a description of energy efficiency action. Use it as a first estimate.
Location based uses the average UK grid factor. Market based reflects the tariff you actually buy, such as a renewable contract backed by certificates. This calculator shows location based.
For most organisations the largest emissions sit in purchased goods and services, which need spend or supplier data. This calculator includes travel, water, waste and electricity network losses only.
There is no single benchmark. Compare emissions per employee or per pound of turnover with peers in your sector, and track your own trend year on year.