Free Tool
Port Distance Calculator
Choose a modelled sea route for 111 ports with canal alternatives, or search 5,966 ports — printed NGA Pub. 151 figures where listed, labelled straight-line estimates elsewhere. Unavailable pairs are stated; junction legs are never combined.
The full port index loads as you reach this section.
How it works
What this estimate means — and what it doesn't.
Modelled route (111 ports)
The modelled network supplies sea-route estimates with channel, canal and chokepoint routing options. It is a planning model, not a navigational route or approved passage plan.
Port index + printed source (5,966 ports)
The picker searches the merged index — NGA Pub. 151 records, World Port Index positions and the modelled network. NGA Pub. 151 provides 18,247 directional entries across 13,865 unique port pairs: a direct printed figure is returned where the source lists the pair, a labelled straight-line estimate where only positions exist, and an honest unavailable otherwise. Junction legs are never combined. The transcription states the 2001 edition and should be checked against the current NGA publication before professional reliance.
Transit time is approximate
Distance divided by the service speed you select — sea time only. Weather, currents, traffic schemes, vessel particulars, and port approaches affect actual voyages.
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Need voyage decision support?
The calculators provide source-labelled planning figures. Voyage Intel Pro adds voyage context and weather-aware decision support; it does not replace approved charts or the master's authority.