Scope 1 Stationary Combustion Calculator

Compute fossil Scope 1 emissions from stationary combustion by multiplying fuel energy with CO₂, CH₄, and N₂O emission factors and applying oxidation and biogenic adjustments.

Lower heating value of fuel burned within the boundary, expressed in MMBtu.
CO₂ factor for the fuel from EPA or IPCC tables, in kilograms per MMBtu.
Defaults to 100%. Apply combustion efficiency/oxidation adjustment when recommended by guidelines.
Defaults to 0%. Portion of CO₂ treated as biogenic and excluded from fossil totals.
Defaults to 0. Use EPA or IPCC kg CH₄ per MMBtu for the combustion technology.
Defaults to 0. Use kg N₂O per MMBtu from regulatory factors if material.
Defaults to 28 per IPCC AR5. Override to align with your reporting standard.
Defaults to 265 per IPCC AR5.

Sustainability reporting helper; align factors and assumptions with the GHG Protocol and your assurance provider before filing.

Examples

  • 18.5 MMBtu natural gas, CO₂ factor 52.9 kg/MMBtu, 99% oxidation, CH₄ 0.003 kg/MMBtu, N₂O 0.0006 kg/MMBtu ⇒ 991.44 kg CO₂e (0.991 tCO₂e).
  • 120 MMBtu biomass blend, CO₂ factor 51.6 kg/MMBtu, 80% biogenic, CH₄ 0.005 kg/MMBtu, N₂O 0.0008 kg/MMBtu ⇒ 1,411.82 kg CO₂e (1.412 tCO₂e).

FAQ

What fuels require oxidation adjustments?

Use published oxidation factors when combustion is incomplete—common examples include coal stokers, coke ovens, or turbines with documented efficiency tests.

How should I handle biogenic CO₂?

Enter the biogenic percentage of the CO₂ factor to report fossil Scope 1 separately while still tracking total emissions for voluntary disclosures.

Where do I find CH₄ and N₂O factors?

Consult EPA AP-42 tables, national inventory reports, or IPCC guidelines—values depend on fuel type and combustion technology.

Can I change the GWP values?

Yes. Override the defaults with the global warming potentials mandated by your reporting programme, such as AR6 or regional regulation updates.

Additional Information

  • Outputs include CO₂, CH₄, and N₂O expressed in kilograms and tonnes of CO₂e.
  • Biogenic share reduces only the CO₂ component; methane and nitrous oxide remain fossil unless separately reported.
  • Oxidation defaults to 100% but may be lower for certain boilers, kilns, or flares per EPA guidance.

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