Free online calculator
Demurrage, Detention & Free Days Calculator
Estimate chargeable days and exposure using arrival, terminal exit, empty return, free days and daily rates.
2cost types
Recurring control
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Track multiple containers and critical dates in Excel.
The PRO tracker is built for free days, terminal exit, empty return, statuses and cost exposure across multiple operations.
What this demurrage calculator tracks
It separates terminal exposure from equipment time after gate-out. Real tariffs may count calendar or working days, use tiered rates, and vary by carrier, terminal, port, contract and equipment. Always validate the final amount against official terms.
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