The biggest cruise ships at sea are like floating cities, equipped with dozens of dining options, world-class theaters, exciting amenities, thousands of staterooms, and more.
Although there's nothing wrong with sailing on older vessels, newer ships tend to have more technologically advanced and thrilling offerings, including robotic bars, skydiving simulators, roller coasters, go-karts, and more.
In 2014, I set sail on an Oasis Class ship for the first time and was amazed at how something that large could float on the water! It sure was not the size of my first cruise onboard Disney Magic in the early 2000s.
Even today, after nearly a dozen cruises onboard Oasis Class ships, as well as one aboard Icon of the Seas, I never can comprehend how large a cruise ship actually is. They are engineering feats that continue to get bigger, bolder, and better than ever before.
Here's a look at just how big modern-day cruise ships are!
What is the biggest cruise ship at sea?
Measuring 1,198 feet in length with a capacity to hold around 10,000 passengers and crew at maximum capacity, the largest cruise ships at sea are Royal Caribbean's Icon, Star, and Legend of the Seas. These massive ships are roughly 6% larger than Wonder of the Seas, the former Oasis Class record-holder.
Their gross tonnage, or the measurement of the internal volume of a ship, is around 248,663. In comparison, Royal Caribbean's smallest ship, Grandeur of the Seas, measures 73,817.
When thinking about my first cruise onboard the 84,000 gross ton Disney Magic, I did not think that I would one day be going on ships double, even triple, that size!
How big is the average cruise ship?
The average cruise ship is the same length as three football fields, or 1,000 feet long, and can accommodate around 3,000 passengers.
While they may not have as many dining, entertainment, and activity options as today's mega-ships, they are a great choice for those who may not want to be surrounded by 5,000+ other people during their vacation.
Plus, they often offer more unique itineraries to destinations that are unable to accommodate larger ships either because of dock size, the depth of the water, or staffing limitations at the port.
Do not be fooled, though — they are still like floating "cities!"
As the average ships are not as wide as their mega-ship counterparts, their gross tonnage is less. Disney Fantasy, for instance, measures 129,600 gross tons, which is almost 100,000 gross tons less than Wonder of the Seas!
Simiarily, Carnival Vista measures 133,3500 gross tons. Both these ships fall within the average gross tonnage for cruises, which comes in at around 120,000-135,000 gross tons.
What are the smallest cruise ships at sea like?
The cruising industry is constantly striving to outdo itself, with Icon Class ships being the most anticipated example. On the other end, though, are ships that lack some of the thrills that make the biggest cruise ships so appealing.
They cater to a different demographic that is more interested in luxurious, intimate experiences and once-in-a-lifetime destinations. For that reason, they can be thought of more like a yacht than a cruise ship.
Celebrity Flora measures 5,739 gross registered tons and is around 333 feet long Due to the ship's size, she lacks most of what people love about bigger ships, including a variety of stateroom options.
Read more: 10 of the Smallest Cruise Ships in the World
How big are modern-day cruise ships compared to the Titanic?
While not a cruise ship in the traditional sense, RMS Titanic is one of the most famous ships in history, albeit not for positive reasons. The ocean liner was built to transport passengers across the ocean, rather than solely for leisure.
At the time, Titanic was considered massive. She was able to hold around 3,320 people, which included 900 crew members. The internal volume, or gross tonnage, of the Titanic was a mere 46,428, and in terms of the length, Titanic was 882 feet long, which is about 35% shorter than Wonder of the Seas.
She, however, was actually longer than some of today's operational cruise ships, including Norwegian Sun, which measures 848 feet long. This ship was launched in 2000 and is one of Norwegian Cruise Line's oldest ships at sea.
Similarly, the aforementioned Grandeur of the Seas measures 915 feet long, which is only 33 feet longer than Titanic was.
Finally, the width of RMS Titanic was 92.5 feet. Today, most cruise ships are around 120 feet wide. Oasis Class ships, however, are an outlier, as Wonder of the Seas clocks in at 210 feet wide, which is over double the width of the Titanic!
Read more: Titanic compared a cruise ship today
Cruise ships compared to famous landmarks and objects
Empire State Building
The Empire State Building is one of New York City's most iconic landmarks--the towering skyscraper can be seen throughout the city!
No cruise ship is quite as tall as the building, though. The building stands 1,454 feet tall, including the antenna. If you do not count the antenna, it is 1,250 feet long. As a reminder, Icon of the Seas is 1,196 feet long.
Eiffel Tower
When most people think of Paris, they think of the Eiffel Tower that stands at the bank of the Seine River.
One of the world's largest cruise ships, Icon of the Seas, is taller than this impressive landmark by 113 feet, as the Eiffel Tower is 1,083 feet tall, including the tip. Without the tip, the Eiffel Tower is 984 feet tall, which is shorter than the average cruise ship.
Washington Monument
At only 555 feet tall, the Washington Monument in Washington D.C. is shorter than most cruise ships. In other words, most cruise ships are around double the height of the monument!
Carnival Cruise Line’s smallest operating cruise ship (as of 2026) is Carnival Paradise, and this ship measures at 860 feet long, or about 55% taller than the Washington Monument!
Read more: Carnival ships by size
Airbus A380
The Airbus A380 is the world's largest and heaviest passenger airliner. As of June 2026, there were less than 200 these two-story aircrafts in operation throughout the world. Shorter than the Washington Monument and most cruise ships, they measure 239 feet long.
The aircrafts are, however, longer than some small ships, including the 207-foot-long Chichagof Dream and 220-foot MS Monet.
How large are cruise ship parts?
With how big cruise ships are, it makes sense that their components are big, too. Starting with the Azipod propellors, they can be as tall as 20 feet!
These propellors are different than traditional propellors in that the way that they function "...increase[s] maneuverability and operating efficiency, with the proven ability to cut fuel consumption by up to 20 percent compared to traditional shaft line propulsion systems," according to an independent study conducted by marine consultancy Deltamarin.
While many cruise lines are building new ships that run on (liquefied natural gas) LNG, many still are reliant on diesel-powered engines. Engines for cruise ships that are between 900 and 1,100 feet long have tanks that can store between one and two million gallons of fuel!
New builds that use LNG-powered fuel are better for the environment, as they help to reduce a cruise ship’s carbon emissions by approximately 30%! These tanks are usually about 115 feet long and 26 feet wide.
We cannot forget about one of the most important parts of the cruise ship: the engine. Today's ships have anywhere between four and six engines that are able to generate 18.5 megawatts each and help the ship move at an average speed of 18 to 22 knots. Sizing can vary; however, they can be as large as 45 feet long and 27 feet high!
Finally, there is the anchor. Did you know that most modern-day cruise ships actually have two anchors, each of which weighing anywhere from 10 to 20 tons (that is 40,000 pounds!)? In terms of their length, the anchors are usually 10 to 20 feet long.
Elizabeth Wright
Elizabeth graduated from New York University's Arthur L. Carter Journalism Institute with her M.A. in Journalism in May 2023. Having sailed on over 30 cruises across different lines, including Royal Caribbean, Carnival, MSC, Margaritaville at Sea, and Princess, she loves sharing her insight and expertise on all things cruising!
In addition to writing for Cruise.Blog, Elizabeth has bylines in Business Insider, Royal Caribbean Blog, and Cruiseshipfood.com.
