What is detention in sea freight?

Detention is a charge incurred when a container is kept outside the port beyond the free time allowance (e.g. at the customer). Detention ≠ demurrage.

What is the difference between detention and demurrage?

Demurrage = container stays in the terminal too long. Detention = container is outside the terminal too long. Demurrage starts at the port, detention from pickup.

How much do typical detention costs amount to?

Detention costs vary by shipping line and route. Typically: $50–150 per day per container for the first few days, then often higher tiered rates.

What are detention charges?

Detention charges arise when a container is not returned to the shipping line within the agreed free time after discharge. Carriers charge daily escalating fees after the free period.

How long is the free time period?

Free time typically ranges from 3–10 days depending on the carrier and trade lane. After this, detention fees begin, increasing with each additional day.

How are detention costs calculated?

Detention = (Return day − free time expiry) × daily rate. Rates are tiered: e.g. days 1–5: USD 50, days 6–10: USD 100, day 11+: USD 150.

Who pays detention charges?

Typically the importer (consignee), unless delay is caused by the freight forwarder or port operator. Clarify liability upfront in the charter party or bill of lading.

How do I avoid detention charges?

Early customs clearance, pre-coordination with warehouse and customs, container tracking, and clear internal return processes help avoid detention charges.

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Detention & Demurrage Calculator

Calculate excess costs for container dwell times

Demurrage = dwell time at port. Detention = dwell time at customer. Both become chargeable once agreed free days are exceeded.

Last updated: 1 August 2026

Methodology & Sources: Calculation formulas are based on established industry standards (IATA, WCO, ICC, CMR). Results are indicative — binding rates are issued by forwarders and carriers. No claim to completeness or legal validity.

Free Days

Actual Days

Number of Containers

Currency

Tiered rates (per container/day)

Tier 1 (Days 1–5)

USD

Tier 2 (Days 6–10)

USD

Tier 3 (Day 11+)

USD

Tips to Avoid D&D

→Negotiate free day extensions with the carrier early.
→Return containers immediately after unpacking.
→Fix deadlines and rates in the contract upfront.
→Build in buffer for long customs clearance times.

Related Tools & Knowledge

Insurance Calculator Transport Costs FCL Incoterms 2020

Start Wissen Tools Partner finden Glossar

Home/Tools/Detention & Demurrage Calculator

Detention & Demurrage Calculator

Calculate excess costs for container dwell times

Demurrage = dwell time at port. Detention = dwell time at customer. Both become chargeable once agreed free days are exceeded.

Last updated: 1 August 2026

Free Days

Actual Days

Number of Containers

Currency

Tiered rates (per container/day)

Tier 1 (Days 1–5)

USD

Tier 2 (Days 6–10)

USD

Tier 3 (Day 11+)

USD

Tips to Avoid D&D

→Negotiate free day extensions with the carrier early.
→Return containers immediately after unpacking.
→Fix deadlines and rates in the contract upfront.
→Build in buffer for long customs clearance times.

Related Tools & Knowledge

Insurance Calculator Transport Costs FCL Incoterms 2020