Demurrage
Usually charged while a full container sits in the terminal past its free time. The clock is often tied to discharge and last free day.
Free tool · estimate only
Demurrage and detention calculator
Estimate charges from your tariff's free days and daily rates. You supply the numbers — this tool doesn't look up tariffs or last free days.
Estimate charges
Runs in your browser. Nothing is saved or sent.
Estimated charges
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Estimate only. Not a quote, invoice or tariff. Confirm free time, day counting and rates with your carrier or terminal.
Demurrage vs detention
Detention
Usually charged while the carrier's equipment is outside the terminal past its free time, until the empty is returned.
Combined terms
Some carriers combine both into one free-time allowance. Check your tariff or contract before estimating.
FAQ
Frequently asked questions
What is the difference between demurrage and detention?
Demurrage is generally charged for a container that stays inside the terminal beyond its free time. Detention is generally charged for holding the carrier's equipment outside the terminal beyond free time, until the empty is returned. Exact definitions depend on the carrier's and terminal's tariffs.
Is this calculator's result what I'll be charged?
No. It's an estimate from the numbers you enter. Actual charges depend on the carrier or terminal tariff, how days are counted, weekends and holidays, and any combined demurrage/detention terms.
Where do I find free days and daily rates?
In your carrier's or terminal's published tariff, or in your service contract. This tool does not look up tariffs or last free days.
How are days counted here?
When you use dates, both the start and end dates are counted, and free days are deducted first. Some tariffs count differently — adjust the numbers to match yours.
What are tiered rates?
Many tariffs charge more per day the longer a container is held — for example, one rate for chargeable days 1–4 and a higher rate from day 5. Add a second tier to model that.
Is my data saved?
No. Everything runs in your browser; nothing is stored or sent.
Catch free-time risk before it's billed.
DESTIN estimates exposure only from explicit dates and your rate rules — and labels it clearly.