HMM Demurrage & Detention Calculator
Recompute HMM D&D invoices: free time, tiered daily rates and per-container totals with an editable tariff.
Set a tier's days to 0 to mean “all remaining days”.
Defaults approximate a common HMM import structure — pull the exact brackets from HMM's published per-country D&D tariff for your trade lane and equipment type.
With your numbers: 10 days − 4 free = 6 chargeable days = 4×$140 + 2×$220 = $1,000 per container.
Sources & references
- HMM — published demurrage & detention tariff (per country/trade)
- FMC 46 CFR Part 541 billing requirements (US trades)
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.
Auditing a HMM demurrage or detention invoice starts with one question: do the free days and tier rates on the bill match the filed tariff for your country and equipment type? HMM — Korea's flagship carrier, operator of some of the world's largest 24,000-TEU ultra-large vessels — publishes those tariffs; this tool recomputes the math once you've pulled the right column.
About HMM Demurrage & Detention Calculator
Mega-ship discharges mean thousands of import boxes hit a terminal at once — availability lags and appointment crunches follow HMM's biggest calls. Operational details like this are why carrier-specific calculators beat generic ones: the failure modes differ line by line. Defaults model a typical import scenario (4 free days, 10-day dwell, tiers of $140×4d, $220×3d, $315+). Edit everything. The per-tier breakdown is intentionally formatted like a carrier billing line so a mismatch jumps out — and a mismatch, documented, is a dispute with a number on it.
How to use HMM Demurrage & Detention Calculator
- 1Enter days on the d&d clock 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 HMM Demurrage & Detention 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
Where do I find HMM's official D&D tariff?+
On HMM's website under demurrage & detention (filed per country and direction, usually with effective dates). Use the document in force on your container's discharge date and the column matching your equipment type — then enter those free days and brackets here to recompute the invoice exactly.
What would 10 days on the clock cost with HMM-typical rates?+
With the preloaded example (4 free days, then $140 for 4d, $220 for 3d, $315 after): 6 chargeable days = 4 × $140 + 2 × $220 = $1,000 per container. Treat it as a calibration point, not a quote — your filed tariff governs.
Why did my free time feel shorter on an HMM mega-ship call?+
Because the clock starts at discharge/availability while pickup capacity is finite: when a 24k-TEU vessel exchanges, appointment systems saturate for days. Free time didn't shrink — the usable part of it did. Document appointment unavailability from day one; that evidence converts the crunch into an extension request rather than a paid invoice.
Can I negotiate free time with HMM?+
Yes — service contracts and even spot bookings can carry extended free time, and it's almost always cheaper than paying tariff-rate D&D. Volume, lane balance and equipment turn speed are your leverage. Price the ask first: this calculator shows what your historical dwell pattern costs at tariff rates, which is exactly the number to bring to the negotiation.
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