RightShip GHG Rating
A–G letter grade comparing a ship's EEDI to peer ships of similar type and size. Used by 90%+ of dry-bulk and tanker charter decisions. Grade A is top 10 %; B 10-30 %; C 30-60 %; D onward increasingly below-peer.
Comparison
Z-score (standard deviations below mean)
0.63σ
RightShip GHG grade
B
Top 30 %
Formula, assumptions, and limits
Positive z = below peer mean = better. Grade bands: A z ≥ 1.3, B ≥ 0.5, C ≥ −0.5, D ≥ −1.3, E onward below. The full RightShip algorithm also factors in age, retrofit history, and operational data for certain ship types.