How Much of a Cruise Ship Is Under Water?

By Michael Ferguson

Cruise ships are some of the most awe-inspiring vessels ever constructed, traveling vast distances and holding hundreds to thousands of passengers. But how much of these massive vessels actually lies beneath the surface of the water?

The answer varies depending on the size and type of cruise ship, but in general, most modern cruise ships have between 10–20 percent of their total volume below the waterline. This means that for every 10 feet (3 m) above the waterline, there is between 1–2 feet (0.3–0.6 m) below it.

This design helps keep the vessel stable and prevents it from tipping over in rough seas. It also allows for a greater displacement of water — which is why cruise ships can be both huge and buoyant at the same time.

The size of a cruise ship’s hull is largely determined by its length, width and depth — with larger vessels needing to have a greater volume below the waterline in order to remain stable. The amount of space needed for passenger accommodation also determines how much or how little volume is available for engines and other machinery.

Modern cruise ships will usually have a draft that ranges from 20–30 feet (6–9 m).

This means that around one-third to one-half of the ship’s total length will be submerged when it is loaded with passengers and cargo. The actual amount depends on several factors such as hull shape, weight distribution and wind resistance — all of which can affect stability and maneuverability.

Cruise ships also feature a range of technology designed to reduce drag while in motion. These include ‘contra-rotating propellers’ which help reduce fuel consumption, as well as ‘stabilizers’ which reduce rolling motion even in rough seas.

In conclusion, while exact figures vary depending on size, shape and purpose, most modern cruise ships typically have between 10–20 percent of their total volume beneath the surface — giving them enough stability to remain afloat while still providing plenty of space for passengers to enjoy all their vacation activities.

How Much Of A Cruise Ship Is Under Water?

The answer varies depending on size but most modern cruise ships typically have between 10-20% of their total volume below the water line. This means that around one-third to one-half of the ship’s total length will be submerged when it is loaded with passengers and cargo.