Build a simple pre-offset emissions footprint from electricity, vehicle fuel, and air travel using emission factors you control. The calculator keeps activity data and factors visible, then compares gross emissions with offsets already retired to show the remaining reported balance.
Gross emissions = Σ(Activity × Emission factor). Remaining balance = max(0, Gross emissions − Offsets retired).
Gross emissions represent the three entered activity sources before offsets. The balance subtracts retired offsets but does not change the underlying gross footprint.
Emission factors vary by location, technology, fuel, cabin class, and methodology. Use factors from the reporting framework that governs your inventory.
120,000 kWh × 0.0004 plus 18,000 gal × 0.00889 plus 85,000 passenger-mi × 0.00015 equals 220.77 t CO₂e gross. After 75 offsets, 145.77 t remains.
Factors change by grid, fuel, travel method, and reporting standard, so editable inputs keep the calculation transparent.
No. Gross emissions remain the same; retired offsets are shown separately against the reported balance.
Enter metric tonnes CO2e per displayed activity unit: per kWh, gallon, or passenger-mile.
Yes. Set both the unused activity and its factor to zero or leave the factor unchanged with zero activity.
The remaining balance is floored at zero, and excess offsets are shown separately rather than as negative emissions.
| Variable | Meaning | Unit |
|---|---|---|
| Electricity factor | Emissions per kWh consumed | t CO₂e/kWh |
| Fuel factor | Emissions per gallon consumed | t CO₂e/gal |
| Air factor | Emissions per passenger-mile | t CO₂e/pass-mi |
| Offsets retired | Credits already retired for this boundary | t CO₂e |