20ft Container Demurrage Calculator
Price 20ft container dwell with special-equipment free time and tier rates — shorter clocks, steeper brackets.
Set a tier's days to 0 to mean “all remaining days”.
Special-equipment tariffs apply — read the 20ft Container column of your carrier's D&D schedule, not the standard dry-box column.
With your numbers: 10 days − 4 free = 6 chargeable days = 3×$130 + 3×$200 = $990 per container.
Sources & references
- Carrier special-equipment D&D tariff columns (per country/trade)
- Container Owners Association — special equipment operations notes
Demurrage, detention and storage tariffs are set by each carrier, terminal and contract and change frequently. The preloaded figures are editable industry-typical examples, not quotes — always verify against the current published tariff or your service contract before paying or disputing an invoice.
Demurrage on a 20ft container plays by harsher rules than the dry boxes around it. The unit is the original TEU — the unit everything else is measured against, still standard for dense and heavy cargo; Twenties often ride share-priced tariffs (20' columns run ~20–30% below 40' rates), but heavy-cargo twenties draw overweight handling fees, and two twenties on one chassis create split-billing puzzles at return. Model the cost here before the terminal does: free days, tiered rates, days on dock.
About 20ft Container Demurrage Calculator
Defaults reflect special-equipment reality (4 free days — shorter than dry — then $130 ×3d, $200 ×3d, $290+). A 10-day dwell totals $990 per unit (3 × $130 + 3 × $200). Edit every field from your carrier's special-equipment tariff column. Audit invoices with the equipment code from the B/L in hand: billing a special at dry rates is rare, but billing dry boxes at special rates (or applying the special's shorter free time to a dry box on the same bill) happens — mixed shipments are where these errors hide.
How to use 20ft Container Demurrage Calculator
- 1Enter days since discharge and how many containers are affected.
- 2Set your free days and edit the tariff tiers to match the published tariff or your contract — every figure is editable.
- 3Read the per-tier breakdown and the worked example showing exactly how the total is built, day by day.
- 4Change the inputs to compare scenarios (pick up now vs later) before the charges harden into an invoice.
Why use 20ft Container Demurrage Calculator?
- ✓Per-tier breakdown mirrors how carrier and terminal billing systems itemise invoices
- ✓Every figure — free time, tier days, rates — is editable to match any published tariff
- ✓Instant what-if comparisons before charges harden into an invoice
- ✓Free and private — all math runs in your browser
Frequently asked questions
How much free time does a 20ft container usually get?+
Less than dry boxes: 4 days is typical where dry cargo might get 4–7, because the equipment is scarcer and (for powered or OOG units) its yard slot is more expensive to provide. Service contracts can extend it — worth negotiating if you regularly ship this equipment type.
What does a 10-day dwell cost on a 20ft container?+
With the example tariff (4 free, then $130 for 3d, $200 for 3d, $290 after): 6 chargeable days = 3 × $130 + 3 × $200 = $990. Special-equipment brackets vary more between carriers than dry rates do — recompute with your actual column.
How does demurrage work for two 20s on one chassis?+
Each container runs its own demurrage and per-diem clock — the chassis is irrelevant to the carrier's billing. If one box clears and one holds, the cleared box should stop billing on its own pickup date. Invoices that bill both boxes to the later date are a classic audit catch: dispute with the two gate records.
Can special-equipment charges be negotiated down?+
Yes, with the same leverage as anything else: volume and predictability. Regular project shippers negotiate special-equipment free time and capped per-diem into contracts. After the fact, your strongest card is carrier-side causation — late availability, refused returns, missing fittings on their depot's side — documented with dates.
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