Ship's Squat, UKC & Anchor Calculator

Ship's Squat & Under Keel Clearance (UKC)

Block Coefficient (C_b): Speed through Water (V, knots): Water Type: Ship's Static Draft (m): Available Water Depth (charted + tide, m): Safety Margin (m):

Formulas (verified standards):
• Open Water Squat = (C_b × V²) ÷ 100
• Confined Water Squat = (C_b × V²) ÷ 50
• UKC = Depth – (Draft + Squat + Safety Margin)

Anchor Dropping Calculator

Water Depth (m): Condition:

Comparison Summary

Condition	Squat Formula	Anchor Length Rule
Open Water	(C_b × V²) ÷ 100	6 to 7 × Depth (Scope)
Confined Water	(C_b × V²) ÷ 50	1.5 × √Depth (Shackles)
Rough Weather	N/A	(3 × Depth) + 140 m