What is the average speed of a large cargo ship?

The average speed of a large cargo ship typically ranges from 15 to 25 knots, which is approximately 17 to 29 miles per hour (27 to 46 kilometers per hour). However, many vessels operate at lower speeds, around 12 to 14 knots, to conserve fuel and reduce emissions, a practice known as slow steaming. Factors such as cargo type, route, and weather conditions can also influence a ship's speed.