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Under Keel Clearance Calculator
Calculate under keel clearance from charted depth, tide, squat and draught.
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UKC
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Calculate under keel clearance from charted depth, tide, squat and draught.
Under Keel Clearance Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: UKC = charted depth + tide – draught – squat – swell allowance.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Under Quick Guide
Typical values for reference.
| Depth | Tide | Draught | UKC |
|---|---|---|---|
| 9 | 0 | 6.2 | 2.10 m |
| 9 | 1.2 | 6.2 | 3.30 m |
| 9 | 2.4 | 6.2 | 4.50 m |
| 9 | 4 | 6.2 | 6.10 m |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Under Keel Clearance Calculator FAQ
Answers to common questions about this calculator.
The water between the lowest part of the hull and the seabed.
The sinking and trim of a ship at speed in shallow water.
Rules vary; many ports require 10 percent of draught or more.
No, it is educational.