About this calculator

Audit an outside-terminal equipment-use date clock from the governing release anchor through the return event. The detention clock is separate from marine-terminal demurrage.

Inputs

How to use this calculator

Clock and agreement inputs

  1. Equipment-use clock anchor dateUse the governing equipment-release clock event; not necessarily the same as the terminal clock.
  2. Equipment-return ending dateEnter the actual accepted return event in the equipment provider’s local calendar.
  3. Count anchor date in this clock?Use your agreement’s starting-day boundary; no default legal rule is implied.
  4. Count ending date in this clock?This is an explicit agreement choice.
  5. Free daysCounted on the free-time calendar below. This is an example, not a carrier allowance.
  6. Calendar for consuming free daysFree-time exclusions can differ from billable-day exclusions.
  7. Dates excluded from free-time countingOptional comma-separated YYYY-MM-DD dates. Used only when the selected calendar includes entered exclusions. No holiday schedule is supplied.
  8. Calendar for billed days after free timeA non-billable date may still advance an elapsed-day rate tier.
  9. Dates excluded from billingOptional comma-separated dates. Used only by an exclusion-enabled calendar. Record terminal closures/holidays only when your agreement permits them.
  10. How escalating rate-tier days advanceTier start 1 is the first post-free-time day under the selected basis; this is not the day since discharge.
  11. Identical containers on this same clockSame events, calendars, free time and rates for each. Calculate differing containers separately.

Shared rate tiers

  1. Rate tier start dayUse unique positive whole days; the table must include day 1.
  2. Daily rate (USD/container)Enter the applicable agreement rate for each tier.

Enter the shipment or scenario values, then select Calculate result.

Method

Formula and variables

Walk the explicitly included local calendar dates. Consume free days only on the free-time calendar until exhausted. After that period, charge eligible dates using a separate billable-day calendar. Choose each rate by its start day under charged-day or elapsed-post-free-time progression. Sum daily charges × identical containers.

Equipment-use clock anchor date
Use the governing equipment-release clock event; not necessarily the same as the terminal clock.
Equipment-return ending date
Enter the actual accepted return event in the equipment provider’s local calendar.
Count anchor date in this clock?
Use your agreement’s starting-day boundary; no default legal rule is implied.
Count ending date in this clock?
This is an explicit agreement choice.
Free days
Counted on the free-time calendar below. This is an example, not a carrier allowance.
Calendar for consuming free days
Free-time exclusions can differ from billable-day exclusions.
Dates excluded from free-time counting
Optional comma-separated YYYY-MM-DD dates. Used only when the selected calendar includes entered exclusions. No holiday schedule is supplied.
Calendar for billed days after free time
A non-billable date may still advance an elapsed-day rate tier.
Dates excluded from billing
Optional comma-separated dates. Used only by an exclusion-enabled calendar. Record terminal closures/holidays only when your agreement permits them.
How escalating rate-tier days advance
Tier start 1 is the first post-free-time day under the selected basis; this is not the day since discharge.
Identical containers on this same clock
Same events, calendars, free time and rates for each. Calculate differing containers separately.
Rate tier start day
Use unique positive whole days; the table must include day 1.
Daily rate (USD/container)
Enter the applicable agreement rate for each tier.

Interpret the result

The estimate follows the entered event boundaries, free-time calendar and rate tiers. Nonidentical containers or different clocks require separate calculations.

Outputs: Free days, billable days and estimated equipment charges

Outside-terminal equipment detention only, under entered terms. This is a separate event clock from marine-terminal demurrage. No combined free time, turn-in acceptance, depot closures, carrier holidays, legal entitlement, dispute outcome or invoice compliance is inferred. Monday–Friday modes and exclusions must match the agreement. No per-hour or rolling 24-hour clocks. Calculate nonidentical containers separately; maximum period 3,660 days.

Worked example

Check the arithmetic

This example uses the starting values shown above. The arithmetic below is calculated independently of the interactive result.

Work through the calculation

  1. The November 2, 2026 anchor is excluded and November 12 return is included: ten counted dates, November 3–12.
  2. Three free dates are November 3–5. November 6–12 gives 7 billed dates.
  3. Default charge = 7 × $100 × 1 container = $700.

Compare the displayed result

Expected displayed result: $700.00

FAQs

Can I reuse the terminal demurrage start date?

Only when the governing equipment-use agreement defines that event. Terminal free time and outside-terminal detention are separate tasks and must not be silently combined.

Example inputs and options

Starting values are examples unless a field identifies a dated rule. Unit selectors convert only fields marked for conversion. Rates and model options keep the units and basis shown in their labels.

Equipment-use clock anchor date
Example: 2026-11-02
Equipment-return ending date
Example: 2026-11-12
Count anchor date in this clock?
Example: Exclude the anchor dateOptions: Exclude the anchor date; Include the anchor date
Count ending date in this clock?
Example: Include the ending dateOptions: Exclude the ending date; Include the ending date
Free days
Example: 3
Calendar for consuming free days
Example: Calendar daysOptions: Calendar days; Monday–Friday only; Calendar days except entered exclusions; Monday–Friday except entered exclusions
Calendar for billed days after free time
Example: Calendar daysOptions: Calendar days; Monday–Friday only; Calendar days except entered exclusions; Monday–Friday except entered exclusions
How escalating rate-tier days advance
Example: Count chargeable days onlyOptions: Count chargeable days only; Count all elapsed calendar days after free time
Identical containers on this same clock
Example: 1
Rate tier start day
Example: 1
Daily rate (USD/container)
Example: 100