POLARIS Risk Index Outcome (RIO)

Risk Index Outcome = sum over ice-type fractions × (ice-type-specific Risk Index Value). Per IMO MSC.1/Circ.1519.

PolarPOLARIS

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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

RIO = \sum_i (C_i \cdot RIV_i)

Symbol	Meaning	Unit
$C_i$	Fraction of each ice type in area
$RIV_i$	Risk Index Value for ship class + ice type

Source: IMO MSC.1/Circ.1519 - POLARIS

Risk Index Outcome = sum over ice-type fractions \u00d7 (ice-type-specific Risk Index Value).