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Free ocean transit calculator for import/export teams. Estimate end-to-end lead time from sailing distance, vessel speed, port dwell, transshipment delays, and customs plus delivery days.
Last updated: April 13, 2026
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Estimated total transit time
35.1 days
ETA range: 33.1 - 37.1 days
Sailing time
26.1 days
Port & ops time
9.0 days
Transit in weeks
5.02
Average vessel speed
16.5 kn
Weather, blank sailings, congestion, and customs events can move final ETA. Use live carrier schedules for shipment-critical commitments.
Calculates core on-water transit time from nautical miles and average vessel speed.
Aggregates non-sailing time to avoid underestimating practical delivery lead times.
Combines sea and landside process steps into one timeline for planning.
Converts day estimates into weeks for long-lane sourcing and inventory policy review.
Adds configurable uncertainty range for better customer and replenishment communication.
Quickly test slower steaming, congestion spikes, or extra customs handling days.
10,350 NM, 16.5 kn, 2.0 origin days, 3.0 destination days, 1.5 transshipment, 2.5 customs, +/-2 buffer.
Sailing days
26.1
Port/ops days
9.0
Total days
35.1
ETA range
33.1-37.1
The calculator converts ocean distance and vessel speed into sailing days, then adds landside timing components including origin and destination port dwell, transshipment handling, and customs/last-mile processing. A buffer creates a practical ETA range for planning uncertainty.
sailing days = ocean distance (nm) ÷ speed (knots) ÷ 24
total transit = sailing + origin dwell + destination dwell + transshipment + customs
eta range = total transit +/- buffer days
Help procurement and logistics teams align on realistic ocean lead-time expectations.
Suggested hashtags: #SeaFreight #OceanShipping #Logistics #SupplyChain #thecalcs