Container demurrage
D&D calculator: demurrage and detention invoice check
Check whether the carrier's invoice for container demurrage matches the contracted free time and daily rate.
Total days
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Chargeable days
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Correct amount
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Container D&D: the number of days between discharge/pickup and empty return, minus the contracted free time, multiplied by the daily rate. The result is compared against the carrier's invoice amount.
Full D&D audit description — D&D audit
Frequently asked questions
Does this calculation have legal force?
No. This is an indicative, preliminary calculation based on the data you enter — useful for a quick self-check, but it doesn't replace a full audit, which additionally checks the invoice's formal completeness, force majeure circumstances, and the contract's fine print before filing a claim with the carrier.
What should I do if the calculator shows a possible overpayment?
Don't send a claim to the carrier yourself based solely on this calculation — contact us and send the invoice and contract. Through a free initial review, we'll confirm whether it's worth filing a claim and for how much.
How accurate is this calculation?
It depends on the accuracy of the data you enter — the calculator performs the same arithmetic our full audit uses, but without document verification, a terminal-tariff database, or an analysis of the contract's fine print. Treat the result as a strong signal, not a final answer.