Does a pass prove STCW compliance?

No. This is a basic screening aid. Exceptions, rolling windows, local rules, emergencies, drills, and record accuracy require competent review.

Is Watchkeeping Rest Hours Calculator free to use?

Watchkeeping Rest Hours Calculator is available as part of the MalkyLab Tools workspace and can be used without a paid unlock flow on the public site.

How do I use Watchkeeping Rest Hours Calculator?

Add each rest period in the same 24-hour window. Review total rest, number of periods, and longest uninterrupted period. Investigate every warning against the applicable rules, exceptions, company procedures, and official records.

Watchkeeping Rest Hours Calculator

Screen a 24-hour rest schedule against common STCW rest-hour thresholds and identify records that need review.

All Marine Tools

Rest Hours Screening Guide

Standard STCW watchkeeper requirements require a minimum of 10 hours of rest in any 24-hour period, which can be split into a maximum of two periods, one of which must be at least 6 hours long.

Rest Period #1 Start

Rest Period #1 End

Rest Period #2 Start

Rest Period #2 End

Calculated Compliance status

10.00 Hours Rest

STCW Basic Rest Hours Criteria Met

Disclaimer: This calculator screens a single 24-hour log. Verify rolling 24-hour windows, exceptions, emergency drills, vessel procedures, flag-state exceptions, and official company records.

About Watchkeeping Rest Hours Calculator

Add rest periods from a single 24-hour window. The calculator totals rest and screens the schedule against the common minimum of 10 hours rest, split into no more than two periods with one at least six hours.

How It Works

1Add each rest period in the same 24-hour window.
2Review total rest, number of periods, and longest uninterrupted period.
3Investigate every warning against the applicable rules, exceptions, company procedures, and official records.