FAQ
About the calculation.
General information only; the charter party wording always governs.
How is demurrage calculated?
Time used is the period from commencement to completion of laytime, less excepted periods. If time used exceeds the laytime allowed, the excess is multiplied by the daily demurrage rate, pro rata for part days.
Do exceptions apply once the vessel is on demurrage?
Generally not. Under English law, “once on demurrage, always on demurrage”: laytime exceptions usually stop applying once laytime has expired, unless the charter clearly says otherwise. This calculator deducts only the excepted time you enter, so enter exceptions that fall before laytime expired.
How is despatch calculated?
If the charter provides for despatch, it is commonly half the demurrage rate, applied either to all time saved or to working time saved, depending on the wording. This calculator uses the time saved shown and the despatch rate you enter.
Can I rely on this for a claim?
Use it as a quick check. A formal claim should include a full laytime statement following the exact charter terms and the statement of facts.
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