Ship Squat Calculation Tool

Input Parameters

Length, L (m)

Breadth, B (m)

Mean draft, Tm (m)

Forward draft, Tf (m)

Aft draft, Ta (m)

Displacement, D (MT)

Speed, U (kn)

Water density, r (MT/m³)

Current speed, UC (kn)

Water depth, h (m)

Required underkeel clearance, UKCreq (m)

Based on DNV-RP-H103, 7.2.10 for open water conditions

Calculation Results

Block Coefficient, CB

0.8889

Relative Velocity, V

10.00

Depth Froude Number, Fh

0.463

Maximum Squat, zmax

0.00

Underkeel Clearance Check

Parameter	Value	Unit	Status
Static UKC	3.00	m	OK
Actual UKC (with squat)	3.00	m	OK
Required UKC	2.50	m	-

Speed Limitation

Maximum vessel speed to achieve UKCreq

0.00

Input Parameters

Length, L (m)

Breadth, B (m)

Mean draft, Tm (m)

Forward draft, Tf (m)

Aft draft, Ta (m)

Displacement, D (MT)

Speed, U (kn)

Environment type

Water density, r (MT/m³)

Current speed, UC (kn)

Water depth, H (m)

Width of channel/passage, W (m)

Required underkeel clearance, UKCreq (m)

Barrass formula for open water or channel conditions

Calculation Results

Block Coefficient, CB

0.827

Relative Velocity, V

8.10

Blockage Factor, S

0.743

Maximum Squat, zmax

1.05

Underkeel Clearance Check

Parameter	Value	Unit	Status
Static UKC	3.50	m	OK
Actual UKC (with squat)	2.45	m	OK
Required UKC	1.50	m	Reference

Speed Limitation

Maximum vessel speed to achieve UKCreq

11.34

OK - Actual UKC (2.45 m) > Required UKC (1.50 m)