Free Freight Tool
Demurrage & Detention Calculator
Estimate container demurrage and detention costs from free days, days used, and daily rates.
Demurrage and detention charges build up once free time ends. The estimate multiplies the chargeable days beyond free time by the daily rate you enter.
How to use the Demurrage & Detention Calculator
- Enter the free days and the actual days used.
- Enter the carrier daily rate.
- Review the estimated cost and confirm the tariff with the carrier.
How to read the result
Tool results are planning aids. Confirm final values with the carrier, forwarder, or customs representative when they affect cost, compliance, or acceptance.
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Frequently asked questions
How is demurrage calculated?
Demurrage is generally the number of chargeable days after free time multiplied by the applicable daily rate. Actual tariffs vary by carrier and port.