Equipment Number (IACS UR A1)

Anchor + chain sizing starts from the Equipment Number. IACS UR A1 combines displacement, side projected area and tier-level superstructure areas.

StructuralIACS A1Anchor

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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

EN = \Delta^{2/3} + 2 (h \cdot B + \sum A_i) + \tfrac{A_\text{profile}}{10}

Symbol	Meaning	Unit
$Δ$	Ship displacement at SLWL	t
$h·B$	Effective height × beam (hull+superstructure)	m²
$\sum A_i$	Sum of tier-level superstructure areas	m²
$A_\text{profile}$	Side-projected area above SLWL	m²
$EN$	Equipment number

Source: IACS UR A1 - Anchor Equipment

Anchor + chain sizing starts from the Equipment Number.