Your company's total Greenhouse Gas (GHG) emissions are built by combining several data sources. Each one feeds a different part of your carbon footprint, and together they cover the three Scopes. Your total emissions are obtained by summing the emissions estimated from all of these sources.

Your accounting data is first imported onto Greenly's platform. By analysing each transaction, categorising it with our algorithm, and multiplying the amount by the corresponding monetary emission factor, the carbon footprint (kgCO2e) associated with each expense is estimated. The emissions of all transactions are then summed.
For example, with a monetary emission factor of 0.5 kgCO2e/$, a $10 expense results in emissions of 5 kgCO2e.
For more detail on how the right emission factor is chosen, see How are GHG emissions computed from expenses and activity data?

Some emissions cannot be estimated from monetary data alone. Additional information is therefore collected in the Company Information and Building tabs of the Data section of Greenly's platform — for instance the number of employees or the office space.
For example, the quantity of office waste generated by the company is estimated from its total number of employees.

The answers provided by your employees are used to understand their transport habits, their food choices, their digital habits, and more. This information is used to estimate the GHG emissions of certain emission categories.
For example, emissions from commuting are estimated using the mode of transport and the distance travelled each day by employees.

The purpose of the monetary approach is to identify the most significant emission sources. These are then fine-tuned through studies based on physical flows, where physical data (L/gallon, km/miles, kg/lbs, etc.) are multiplied by activity-based emission factors. Specific modules can also be used to model particular activities more precisely.
To learn more about this two-step logic, see A two-step calculation method.