Monthly Carbon Reporting
How to Calculate Monthly Business Carbon Emissions
A simple monthly workflow for calculating business carbon emissions from electricity, fuel use, employee count, and emission factors.
A monthly carbon emissions calculation helps a business understand what happened in a specific reporting period. It is easier to manage than a once-a-year calculation because the data is fresh and easier to verify.
The basic emissions formula
The basic formula is simple: activity data multiplied by an emission factor equals emissions.
For example, electricity use in kWh multiplied by an electricity factor gives Scope 2 emissions. Fuel quantity multiplied by a fuel factor gives Scope 1 emissions.
Step 1: Choose the reporting month
Start by choosing one month. A clear reporting period prevents confusion when reviewing results later.
Using a monthly period also makes future comparisons cleaner because each report follows the same rhythm.
Step 2: Collect electricity data
Record the electricity consumed during the month, usually in kWh. Then apply the electricity emission factor that matches the reporting method and location or supplier basis used.
The result is Scope 2 emissions for that reporting month.
Step 3: Collect fuel data
Record the fuel type, quantity, unit, and matching emission factor. If your business uses more than one fuel type, calculate each row separately and add the results.
This gives a more accurate Scope 1 total than forcing all fuel use into one generic fuel field.
Step 4: Review emissions per employee
Employee count helps convert total emissions into an intensity figure. This can make changes easier to interpret when business size changes.
For example, total emissions may rise because operations expanded, while emissions per employee may stay stable or improve.
Illustrative calculation example
For illustration only, if a business records 1,000 kWh and uses a hypothetical factor of 0.50 kg CO2e per kWh, the calculation is 1,000 × 0.50 = 500 kg CO2e for that electricity activity.
This is a worked example, not a recommended universal factor. The business should select the factor that matches its own reporting method, location or supplier basis, unit, source, and reporting period.
Final takeaway
Monthly carbon emissions calculations work best when they are consistent. Use the same reporting structure each month, keep factors visible, and review both totals and intensity.
Sources and methodology
Last reviewed September 24, 2026.
Common questions
What is the basic emissions formula?
Activity data multiplied by a matching emission factor equals emissions for that activity.
Should I retain the factor source?
Yes. Keeping the factor, its unit, source, and version makes the result easier to review later.