How the answer is built
The calculator reads the free days and the way days are counted from the carrier’s published US tariff in our data, then counts from the date you enter. It tells you when it cannot: if the tariff does not say when counting starts, or we do not hold the tariff, the answer is “not calculated” with the reason, and never a guess.
- Calendar days count every day. Working days skip days the tariff excludes. We count working days the way each tariff defines them: Monday to Friday unless the tariff says otherwise (the Maersk US tariff counts a working day as a day the gate is open Monday to Saturday), and never US federal holidays (list below). A terminal can close on other days too, so treat the result as a check and confirm the date with the carrier.
- The count start differs by tariff: discharge day, the day after discharge, the availability date, gate-out. The result names the one used.
- A contract with the carrier may give more free time than the published tariff. The calculator knows only the published tariff.
- Port rows win over all-port rows when a tariff has both.
US federal holidays used for working days
- : New Year's Day
- : Birthday of Martin Luther King, Jr.
- : Washington's Birthday
- : Memorial Day
- : Juneteenth National Independence Day
- : Independence Day
- : Labor Day
- : Columbus Day
- : Veterans Day
- : Thanksgiving Day
- : Christmas Day
- : New Year's Day
- : Birthday of Martin Luther King, Jr.
- : Washington's Birthday
- : Memorial Day
- : Juneteenth National Independence Day
- : Independence Day
- : Labor Day
- : Columbus Day
- : Veterans Day
- : Thanksgiving Day
- : Christmas Day
Source: OPM federal holidays. Generated 2026-10-21.
Carrier pages
Hapag-Lloyd , ONE , ZIM , Maersk , MSC . Where we do not hold a carrier’s tariff the page says so and links to the carrier.
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