Free Tool
Laytime & Demurrage Calculator
Allowed hours vs time used — excepted periods stripped from the statement of facts → demurrage owed or despatch earned.
Excepted periods — weather delays, strikes, Sundays/holidays under SHEX — don't count against laytime:
Terms: SHEX — Sundays & holidays excepted. Allowed time = cargo ÷ rate; used time = commencement to completion minus excepted periods you enter. NOR validity, notice time, shifting time, and charter-party-specific clauses (e.g., WWD rain time counted per actual interruption) must be applied in the exclusions — this is a statement-of-facts arithmetic aid, not a legal determination.
How it works
Charter-party arithmetic, line by line.
Allowed time
Cargo quantity ÷ loading/discharging rate — the laytime the charter party grants, in hours. Terms (SHINC/SHEX/EIU/WWD) selected for context.
Time used
Commencement to completion, minus every excepted period you list — Sundays and holidays under SHEX, weather delays, strikes and non-working windows.
An aid, not a determination
NOR validity, notice time, shifting and clause-specific treatment are entered through the exclusions you supply. A statement-of-facts arithmetic tool — not a legal ruling.
Get in touch
Compare the voyage economics first.
The voyage estimator prices the whole fixture — freight, bunkers, port costs and commission.