Ship Voyage Time & ETA Calculator

Sea Time • Speed Over Ground • UTC / Local ETA • Schedule Buffer • Required Speed • Leg-by-Leg Route • Delay & Current Sensitivity

Ship Voyage Time & ETA Calculator

Calculate voyage duration and arrival ETA from route distance, through-water speed, current, weather loss and operational delays. Simple mode gives a fast schedule screen. Advanced builds the voyage leg by leg, applies speed caps and route allowances, back-solves the speed factor needed to protect a target ETA, and shows how delay, weather and current assumptions move the arrival window.

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Need multiple route legs, speed caps, current by leg, route allowance or ETA sensitivity? Click Advanced above.Simple treats the voyage as one sea leg with a fixed user-entered UTC offset at departure and arrival.

Voyage clockSea time + fixed delays

ETAUTC + arrival local

Schedule controlBuffer + required speed

Route & Speed

Voyage distancenautical miles.

Planned through-water speedknots before weather loss and current.

Average currentknots. Positive is favorable, negative is adverse.

Weather / sea speed loss% applied to through-water speed.

Fixed operational delayhours for pilotage, canal, anchorage, traffic or other fixed time.

Departure, Arrival & Target

Departure date & local time

Departure UTC offsetUTC hours, for example -5 or +8.

Arrival UTC offset

Target arrival date & local timeOptional. Leave blank for ETA-only calculation.

Schedule reservehours of desired buffer before the target arrival.

Schedule Basis

Departure date & local time

Departure UTC offset

Arrival UTC offset

Target arrival date & local timeOptional.

Schedule reservehours protected before target arrival.

Route / deviation allowance% added to each moving leg distance.

Additional voyage delayhours outside the leg register.

Voyage Leg Register

Each moving leg can have its own planned through-water speed, speed cap, current, weather loss and fixed delay. Distance 0 can be used for a pure waiting / canal / anchorage delay row.

Use	Leg type	Distance NM	Planned STW kt	Speed cap kt	Current kt	Weather loss %	Fixed delay hr

Schedule Readiness Checks

Route distance verifiedPlanned nautical-mile distances reflect the intended routing and mandatory waypoints. Weather routing reviewedSpeed-loss assumptions reflect the current planning forecast or routing advice. Current assumptions reviewedLeg currents are directionally consistent with the planned route and forecast. Pilot / canal windows reviewedFixed delays include known transit, pilotage or tidal-window constraints. Port / berth status reviewedTarget ETA is consistent with current berth or terminal information. UTC offsets verifiedEntered offsets reflect the intended local time basis at departure and arrival.

Planning limitation: this is a deterministic voyage-time screen, not a weather-routing or navigation system. Actual ETA can change with routing decisions, traffic, tides, pilotage, canals, machinery, speed restrictions, security constraints, port congestion and updated forecasts. UTC offsets are fixed user inputs and do not automatically adjust for daylight-saving changes.

Calculation basis: one knot equals one nautical mile per hour. Sailing time is effective nautical-mile distance divided by modeled speed over ground. Simple mode applies a single weather-loss percentage and current to the entered through-water speed. Advanced mode solves each voyage leg separately, applies its entered speed cap, current, weather loss and fixed delay, then sums the route. Target-speed analysis back-solves the common multiplier on planned leg speeds that meets the target arrival after the entered schedule reserve, subject to the leg speed caps.

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