This toll calculator is deliberately configurable and is based on charging dimensions commonly used by major canals: vessel type, fixed size category, billable unit, ballast/laden status, dangerous cargo, container mix, and operational surcharges. It aims to closely estimate official Strait of Hormuz transit fees.
The form loads with a large crude tanker profile so you can test the calculator immediately. Change the ship type and capacity fields to see the billing basis switch in practice.
In the future, you may feed these values from AIS + ship particulars rather than manual entry: MMSI/IMO lookup, vessel type, LOA, beam, draft, GT/NT, DWT, cargo class, TEU capacity, and live transit status.