Demurrage & Detention Calculator
Estimate demurrage (vessel/container held at terminal) and detention (equipment held outside terminal) after free-time expiry. Supports tiered carrier rates for boxes or fixed daily hire/laytime penalties for bulk and tanker vessels.
Default detention tiers: d1–5: 90 · d6–10: 180 · d11+: 300
Numerical Example: Container D&D Estimate
Calculation based on standard carrier tiered rates for container equipment.
| Type | Tier | Days | Rate | Cost |
|---|---|---|---|---|
| Demurrage | Day 1–4 | 3 | $75.00 | $225.00 |
Overview & methodology
Demurrage vs detention
Demurrage is the charge for keeping a full container inside the terminal beyond free-time. Detention is the charge for keeping the container (or the chassis) outside the terminal - after unloading - beyond the return free-time. Carriers either give separate free-time pools (carrier haulage) or a single combined pool (merchant haulage) that is consumed chronologically.
Frequently asked questions
What is the difference between demurrage and detention?
Demurrage is charged when a loaded container overstays free-time at the terminal (import) or waiting to load (export). Detention is charged when the container itself is held outside the terminal - typically at the consignee's yard being unloaded.
Are demurrage rates tiered?
Yes, almost always. A common structure is Tier 1 (days 1–3 past free-time) at USD 100/day, Tier 2 (days 4–7) at USD 200/day, Tier 3 (days 8+) at USD 400/day. Free-time and tier rates vary by carrier, port and container size.