Method: Fuel emissions are calculated as: CO₂e = Fuel Consumption × Emission Factor The consumption unit must match the emission-factor denominator. Examples: litres × kg CO₂e/litre kg × kg CO₂e/kg m³ × kg CO₂e/m³ kWh × kg CO₂e/kWh MWh × kg CO₂e/MWh US gallons × kg CO₂e/US gallon The calculator does not automatically convert a volume-based fuel quantity into mass or energy because those conversions depend on fuel density, composition and calorific value. Emission factors vary by fuel specification, country, reporting year and whether the factor includes CO₂ only or total CO₂e including CH₄ and N₂O. Biomass requires particular care. Biogenic CO₂ may be reported separately under some greenhouse gas accounting frameworks, while associated CH₄ and N₂O may still be included in Scope 1. Enter the factor applicable to your chosen reporting methodology. Annualized emissions are provided only as a convenience when the entered consumption represents a daily or monthly quantity.