How do you calculate demurrage exposure?

Multiply chargeable demurrage days by the daily rate and by the share of containers actually at risk, then add fixed release and drayage costs. With 5 days, $175/day, 60% at-risk, and $300 fixed, exposure is 5 x 175 x 0.60 = $525 variable plus $300 = $825 total.

What is the difference between demurrage and detention?

Demurrage is charged for a container that stays inside the terminal past free time; detention is charged once you take the box out but hold the carrier's equipment too long before returning it empty. This calculator models demurrage, the in-terminal penalty.

What is a typical demurrage rate per day?

US port demurrage commonly runs $150 to $300 per container per day for the first tier, then escalates. The $175/day default sits in that range; always confirm your carrier's tariff since rates jumped sharply during congestion peaks.

Why include an at-risk container share instead of all containers?

Not every container in a shipment will actually dwell past free time. The at-risk share (60% here) discounts exposure to the fraction realistically expected to be held up by holds, appointments, or capacity, giving a probability-weighted estimate.

How can I reduce demurrage exposure?

Pre-clear customs before vessel arrival, book pickup appointments the moment containers are available, arrange chassis in advance, and stage receiving labor. Each shaved chargeable day cuts about $165 per day in this example.

Is the fixed release and drayage cost part of demurrage?

Not technically, but it is bundled here because you cannot free a container without paying release fees and drayage. Adding the $300 fixed cost gives the true out-the-gate cost of clearing at-risk boxes.

Transportation, Freight & Distribution calculator

Demurrage Exposure Calculator

Demurrage exposure is the dollar risk you carry when import containers sit at a terminal past their free-time window and rack up daily penalty charges before you can pull them. Import managers, drayage coordinators, and 3PL analysts use it to size the financial downside of port congestion, chassis shortages, or customs holds before invoices land. It matters because demurrage is a fast-compounding cost that is largely preventable with earlier appointments and pre-cleared paperwork. Modeling exposure lets you decide whether expedited pickup or extra warehouse labor is cheaper than eating the penalty.

What this calculator does

Estimate port, rail, or container demurrage exposure from chargeable days, daily rate, risk share, and fixed broker or drayage charges.
Use it when containers may miss free time because of customs holds, appointment delays, warehouse congestion, or paperwork issues.
It computes the total demurrage dollar risk by combining chargeable days times daily rate times the at-risk container share, then adding fixed release and drayage costs.

Formula used

Variable demurrage exposure = chargeable demurrage days × demurrage rate × at-risk container share
Total demurrage exposure = variable demurrage exposure + fixed release and drayage cost

Inputs explained

Chargeable demurrage days beyond free time:
Carrier demurrage rate per container:
Share of containers at risk of dwelling:
Fixed release and drayage cost:

How to use the result

Use it when containers are approaching or have passed last free day and you need to weigh expedited pickup against paying the penalty.
It assumes a single blended daily rate; real tariffs often escalate in tiers (higher per-diem after day 5 or 10), so long dwells can understate true exposure.

Current U.S. benchmarks

On-highway diesel averages $4.58 per gallon this week (EIA), trending down over recent periods. Truck tonnage is up 3.4% year over year (ATA via FRED).

Common questions

How do you calculate demurrage exposure? Multiply chargeable demurrage days by the daily rate and by the share of containers actually at risk, then add fixed release and drayage costs. With 5 days, $175/day, 60% at-risk, and $300 fixed, exposure is 5 x 175 x 0.60 = $525 variable plus $300 = $825 total.
What is the difference between demurrage and detention? Demurrage is charged for a container that stays inside the terminal past free time; detention is charged once you take the box out but hold the carrier's equipment too long before returning it empty. This calculator models demurrage, the in-terminal penalty.
What is a typical demurrage rate per day? US port demurrage commonly runs $150 to $300 per container per day for the first tier, then escalates. The $175/day default sits in that range; always confirm your carrier's tariff since rates jumped sharply during congestion peaks.
Why include an at-risk container share instead of all containers? Not every container in a shipment will actually dwell past free time. The at-risk share (60% here) discounts exposure to the fraction realistically expected to be held up by holds, appointments, or capacity, giving a probability-weighted estimate.
How can I reduce demurrage exposure? Pre-clear customs before vessel arrival, book pickup appointments the moment containers are available, arrange chassis in advance, and stage receiving labor. Each shaved chargeable day cuts about $165 per day in this example.

Last reviewed 2026-05-12.