GFI Attained - WtW Intensity from Fuel Mix

Compute the well-to-wake GHG fuel intensity (Attained GFI) of a ship's annual fuel mix, in g CO₂e/MJ, using the IMO LCA Guidelines default values from MEPC.391(82). The Attained GFI feeds the IMO Net-Zero Framework compliance check.

IMONet-Zero FrameworkMEPC.391(82)

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{GFI}_\text{attained} = \frac{\sum_j m_j \cdot LHV_j \cdot WtW_j}{\sum_j m_j \cdot LHV_j}

Symbol	Meaning	Unit
$\text{GFI}_\text{attained}$	Attained GHG Fuel Intensity	g CO₂e / MJ
$m_j$	Mass of fuel $j$ burned in the reporting year	t
$LHV_j$	Lower heating value of fuel $j$	MJ / kg
$WtW_j$	Well-to-wake GHG intensity of fuel $j$	g CO₂e / MJ

Source: IMO MEPC.376(80) - 2024 Guidelines on Lifecycle GHG Intensity of Marine Fuels; IMO MEPC.391(82) - 2024 Update to LCA Guidelines (default pathway values); IMO MEPC 83 (April 2025) - Net-Zero Framework approval

In short

Compute the well-to-wake GHG fuel intensity (Attained GFI) of a ship's annual fuel mix, in g CO₂e/MJ, using IMO LCA Guidelines default values from MEPC.391(82).

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