Ferry Time: Distance Divided by Speed in Knots
Ferry speeds come in knots, but distances come in kilometres. Converting knots to km/h first makes the division work.
What is the Ferry Time Calculator?
Ferry time is distance divided by speed, with knots converted to kilometres per hour. This calculator gives the sailing time only; boarding, loading, and disembarkation add extra time on top. Weather and sea conditions can slow crossings further.
How to use it
- Enter the crossing distance in kilometres.
- Enter the ferry speed in knots.
- Click Calculate Ferry Time for the sailing time.
Worked example
A 40 km crossing at 20 knots (37.04 km/h) takes about 1 hour 5 minutes of sailing time.
How long is a 40 km ferry crossing at 20 knots?
About 1 hour 5 minutes of sailing time, at 37.04 km/h, plus boarding time.
Frequently asked questions
What is a knot in km/h?
One knot equals 1.852 km/h, so 20 knots is 37.04 km/h.
Why do real crossings take longer?
Boarding, vehicle loading, and disembarkation sit outside sailing time, and rough seas slow the crossing itself.