VoyageDistance

Free Sea Distance & Transit Time Calculator: Port to Port & Multi-Leg Voyages

Calculate shipping distance and marine transit time between ports along real shipping routes — a free sea distance and transit time calculator for port-to-port and multi-leg voyages. Add as many stops as you need, no login or account required. It also works as a cargo ship distance calculator: pick a vessel type to estimate CO₂ emissions for bulk carriers, container ships, tankers, and more on the same route.

Routes are generated for visualization and voyage appraisal, not for actual ship navigation.

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Canals / straits the route may use

About the Kolkata → Shanghai route

Sea route map from Kolkata to Shanghai — 3825 nautical miles

The sea route from Kolkata to Shanghai covers approximately 3825 nautical miles (7084 km). At a typical vessel speed of 14 knots, that's roughly 11 days at sea, not including port time, weather routing, or canal transit delays.

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Frequently asked questions

How is the Kolkata to Shanghai transit time estimated?

VoyageDistance calculates the Kolkata–Shanghai route along real shipping lanes and chokepoints, then divides the total distance by an assumed vessel speed (14 knots by default) to estimate transit time. Adjust the speed above to match your own vessel.

Does the Kolkata to Shanghai distance change with vessel speed?

No — distance is fixed by the route geometry. Only transit time changes with speed, so adjust the speed field above to see estimates for different vessel speeds.