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Demurrage Calculator in Excel: Free Days, Detention and Deadline Control

A practical guide to tracking free days, demurrage, detention and container deadlines in Excel.
October 03, 2026 1 min read
Demurrage and Free Days Tracker Excel dashboard by ImportVista

Demurrage and detention costs often start with missed dates. A simple Excel tracker can help centralize the deadlines that matter before charges begin.

Free days and demurrage

Free days are the period allowed before specified charges may apply. The exact rules depend on the carrier, terminal, equipment, contract and location, so the official conditions for each shipment should always be checked.

What to track

  • Container or shipment reference
  • Arrival or discharge date
  • Terminal free days
  • Last free day
  • Terminal exit date
  • Equipment free time
  • Empty return date
  • Estimated daily rates

How an Excel demurrage calculator helps

Once the key dates are entered, Excel can calculate days beyond the deadline and estimate potential cost exposure. Visual status fields can also flag operations that are approaching the last free day.

The ImportVista Demurrage & Free Days Tracker is built for this workflow and includes deadline calculations, status alerts and estimated charges.

For broader control across shipments, freight quotes, landed cost and documents, see the PRO Pack.

1LearnUnderstand the workflow in this guide
2TryUse a free tool first
3PROMove it into a reusable template
See use case: 20 imports/month →
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Put the guide into practice

Use Excel tools built for real logistics operations.

Shipment tracking, landed cost, freight quotes, documentation and free days in ready-to-use templates.

Can I try ImportVista before buying?+

Yes. ImportVista offers free online calculators and Excel resources so you can test the workflow before moving to a PRO template.

Do the templates connect automatically to carriers or ERP systems?+

No. Standard templates use the data you enter in Excel. Carrier APIs, ERP, TMS and external automations are separate projects.

Is it a subscription?+

No. Standard templates and packs are one-time purchases; any product with different terms states them clearly on its product page.