Estimate Ferry Length Supplements from the Booked Vehicle Envelope — Free
A rack or trailer can move a vehicle into another ferry length band. Model a stated per-started-metre supplement before comparing bookings, using the full envelope the operator asks for.
The proof surface
Cruise port-fee tallies add passenger charges. This models a vehicle-length tariff and rounds each option separately; it does not compare cabin or passenger fares.
Why the flat version breaks
Leaving off an attached rack
The booking envelope may exceed the manufacturer’s bare-vehicle dimension.
Rounding before subtracting the allowance
Subtract first, then round the positive excess to started metres.
Treating this as a live fare quote
Passenger fares, dates, height bands and operator rules remain outside the calculation.
How to work the vehicle-length tariff stub
Include racks, trailers and tow equipment only as the operator specifies. Measure the full booked combination rather than copying the car’s bare length.
Use this only for a charge per started metre above an included length. Discrete named bands, maximum lengths and dynamic fares need the actual booking quote.
Supplement = ceil(max(0, booked length − included length)) × charge. A 5.4 m vehicle above a 5 m allowance uses one started metre; 7.1 above 6 uses two.
Positive supplements are flagged. The summary selects the lowest alternative supplement, not a complete fare. Confirm height, width, fuel and availability restrictions directly before booking.
What the vehicle-length tariff stub replaces
| Question | Before | Visible working |
|---|---|---|
| Leaving off an attached rack | The booking envelope may exceed the manufacturer’s bare-vehicle dimension. | Confirm the exact tariff structure |
| Rounding before subtracting the allowance | Subtract first, then round the positive excess to started metres. | Round excess length upward per option |
| Treating this as a live fare quote | Passenger fares, dates, height bands and operator rules remain outside the calculation. | Check every flagged alternative |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Research prototype — checkout unavailable. Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Hypothetical tariff arithmetic only, not a carrier quote or boarding guarantee. Verify measurement and safety requirements with the ferry operator.
Data note: Everything runs in this browser tab on the vehicle-length tariff stub: your vehicle option | total booked length metres | included length metres stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a punched ticket stubs
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the vehicle-length tariff stub reading, and holds your drafts on this device — one complete free run; the proposed $4 one-time filing layer is not currently for sale.
The vehicle-length tariff stub reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the estimate ferry length supplements from the booked vehicle envelope companionBoundary
Hypothetical tariff arithmetic only, not a carrier quote or boarding guarantee. Verify measurement and safety requirements with the ferry operator.
What this is built on
- Method: Supplement = ceil(max(0, booked length − included length)) × charge. A 5.4 m vehicle above a 5 m allowance uses one started metre; 7.1 above 6 uses two.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-29, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Before: The booking envelope may exceed the manufacturer’s bare-vehicle dimension. After: the vehicle-length tariff stub shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this vehicle-length tariff stub, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a vehicle-length tariff stub. Return plain rows only: vehicle option | total booked length metres | included length metres. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: vehicle option | total booked length metres | included length metres. No AI response is executed as code.