Interactive Operational Carbon Calculator
Estimate Net Annual Energy & CO₂e Reduction
Change every input to match the project. The default emissions factors are rounded planning examples only. Confirm the correct factor, reporting year, energy source, unit and reporting methodology before using the result in formal carbon reporting.
kWh
Use the energy affected by the proposed project,
not the whole site total unless all of it is relevant.
%
Use a project-supported figure. Do not treat
research examples as guaranteed site savings.
kg CO₂e/kWh
0.182 is the editable rounded planning example
contained in the source calculator. Replace it
with the approved factor for the actual energy
source and reporting year.
Include every fan expected to operate in the
assessed mode.
W
300 W is an editable AirMax 730 winter-operation
example from the source calculator, not a
universal fan consumption figure.
hrs
Use expected annual hours after schedules,
seasonal operation and occupancy are considered.
kg CO₂e/kWh
0.131 is the editable rounded UK-grid planning
example used in the supplied calculator.
Confirm the appropriate reporting factor
before formal use.
years
This simple total does not account for future
emissions-factor changes, degradation or
changes in building operation.
Important:
this calculator estimates operational emissions
only. It is not a quotation, verified carbon
footprint, life-cycle assessment, SECR disclosure,
financial advice or performance guarantee.
Illustrative Net Result
Your Editable Carbon Estimate
Gross Energy Avoided
0 kWh
Before fan electricity
Gross Emissions Avoided
0.0 tCO₂e
Energy saved × avoided-energy factor
Fan Electricity
0 kWh
Fan count × kW × annual hours
Fan Electricity Emissions
0.0 tCO₂e
Fan electricity × electricity factor
Net Annual Reduction
0.0 tCO₂e
Gross avoided emissions minus fan emissions
Assessment-Period Reduction
0.0 tCO₂e
Simple net annual result × selected years
Enter the project assumptions to calculate
an illustrative result.