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The 21 largest cruise ships in the world.

Book your next cruise vacation on one of these floating megaresorts.

The Largest Cruise Ships in the World

Courtesy of Royal Caribbean International

With every year comes bigger and grander cruise ships.

Just when you think cruise ships can't get any larger, a major cruise line unveils yet another longer, taller and grander state-of-the-art vessel – with the capacity to carry the population of a small town. To put the size of today's megaships into perspective: They often stretch three times longer than a 120-yard football field, and some feature nearly two dozen decks or measure more than 215 feet wide.

So, if you're looking for a vacation aboard a large-scale vessel, consider booking a voyage on one of the biggest cruise ships in the world. With cutting-edge technology and entertainment, world-class dining, and endless attractions and activities for cruisers of all ages, you may not even want to leave the ship. Here are the biggest cruise ships, arranged by gross tonnage.

• 1. Royal Caribbean Icon of the Seas
• 2. Royal Caribbean Utopia of the Seas
• 3. Royal Caribbean Wonder of the Seas
• 4. Royal Caribbean Symphony of the Seas
• 5. Royal Caribbean Harmony of the Seas
• 6. Royal Caribbean Oasis of the Seas
• 7. Royal Caribbean Allure of the Seas
• 8. MSC World Europa
• 9. Costa Smeralda
• 10. Costa Toscana
• 11. P&O Cruises Arvia
• 12. AIDAcosma
• 13. P&O Cruises Iona
• 14. AIDAnova
• 15. Carnival Jubilee
• 16. Carnival Celebration
• 17. MSC Euribia
• 18. MSC Virtuosa
• 19. Carnival Mardi Gras
• 20. MSC Meraviglia
• 21. Norwegian Encore

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Royal Caribbean Icon of the Seas

Length: 1,198 feet

Width: 213 feet

Gross tons: 250,800

Maximum number of passengers: 7,600

Icon of the Seas will be the largest cruise ship afloat when it debuts in January 2024. The next-level megaship is Royal Caribbean 's first Icon-class vessel and the first of three ships powered by liquefied natural gas, or LNG, which is considered a more sustainable alternative to other fuel options. The ship will have 2,805 staterooms and carry up to 2,350 crew. There's no end to the fun with eight unique neighborhoods, including the new Surfside: a stay-all-day space designed specifically for families.

Other features on the ship include seven pools, nine whirlpools and six record-breaking waterslides. There are also more than 20 new dining venues, such as the swanky Empire Supper Club, which features an eight-course tasting menu; the AquaDome Market, the line's first food hall; and sushi restaurant Izumi in the Park. Cruisers will also find other international cuisine, including Japanese, Mexican and Italian fare, as well as The Lemon Post, the Surfside Eatery and Pier 7 in the Surfside neighborhood.

Read: The Newest Royal Caribbean Ships

Royal Caribbean Utopia of the Seas

Length: 1,188 feet

Width: 211 feet

Gross tons: 236,860

Maximum passengers: 6,788

Royal Caribbean's first LNG-powered Oasis-class ship will sail its debut voyage in July 2024. The new ship will have 2,834 staterooms and up to 2,290 crew members, as well as eight neighborhoods to keep passengers entertained. Ten complimentary dining venues include the line's new food truck concept, The Spare Tire, which serves up handheld eats on the pool deck. The ship will also feature sloping beach-entry and resort-style pools, plus three Lime & Coconut bars on the outdoor deck.

In total, there are more than 40 dining options, bars and lounges on Utopia of the Seas. Many of Royal Caribbean's specialty dining and bar favorites are returning, such as Chops Grille, Giovanni's Italian Kitchen & Wine Bar, Rising Tide Bar and Vue Bar. Guests will also find familiar entertainment offerings with rock climbing walls, the AquaTheater, Splashaway Bay, laser tag, mini-golf, the Sports Court, Studio B and much more. With two casinos, five pools and a visit to private island Perfect Day at CocoCay, you'll never run out of things to do.

Read: The Top New Cruise Ships

Royal Caribbean Wonder of the Seas

Michel Verdure | Courtesy of Royal Caribbean International

Gross tons: 235,600

Maximum passengers: 7,084

Royal Caribbean's current largest ship at sea, Wonder of the Seas , first set sail in March 2022. The Oasis-class vessel has 2,867 staterooms and carries as many as 2,204 crew members. While you may get lost on this ship, you'll never be bored. Features include eight unique neighborhoods – such as Central Park, the Boardwalk, and the new Suite Class neighborhood, an exclusive space for suite guests.

Take advantage of the AquaTheater, an outdoor live entertainment venue with a 30-foot diving platform and incredible ocean views. Wonder Playscape is an underwater-themed outdoor space for kids filled with slides, climbing walls, games and more. You can also enjoy a few of Royal Caribbean's Oasis-class favorites, such as the FlowRider surf simulator, the rock climbing wall or laser tag at the Battle for Planet Z. If you dare, head into the Ultimate Abyss: Billed as the tallest waterslide at sea, it towers 150 feet above sea level and features an exhilarating 13-second ride through 10 stories of dark, winding tunnels.

When hunger strikes, dine at your pick of more than 20 complimentary and specialty restaurants, including the new Mason Jar Southern Restaurant & Bar. If you're craving a cold beer, a cocktail or a cup of Starbucks coffee, you'll have roughly a dozen bars and lounges at your disposal.

Read:  The Top Party Cruises

Royal Caribbean Symphony of the Seas

Width: 215.5 feet

Gross tons: 228,081

Maximum passengers: 6,680

Royal Caribbean's Symphony of the Seas , another Oasis-class ship, debuted in April 2018. This ship features 2,759 passenger staterooms and accommodates 2,200 crew members. There are seven distinct neighborhoods, four pools, roughly 20 restaurants (about half of which are specialty venues), and about a dozen bars and lounges. The ship even boasts two robotic bartenders that whip up drinks at the Bionic Bar.

Adults can enjoy Broadway-style shows in the onboard theaters and major international sports games at Playmakers Sports Bar & Arcade. Meanwhile, kids can cool down at the Splashaway Bay water park, soar on a zip line nine decks high through the Boardwalk neighborhood, try out rock climbing or attend a show at the AquaTheater.

Read:  Royal Caribbean vs. Carnival

Royal Caribbean Harmony of the Seas

Gross tons: 226,963

Maximum passengers: 6,687

Another Oasis-class ship, Royal Caribbean's Harmony of the Seas has been sailing since May 2016. The vessel features 2,747 staterooms and up to 2,200 crew members. Cruisers have plenty of places to dine thanks to eight complimentary venues – including the main dining room and Windjammer Marketplace, a globally inspired buffet – as well as nine specialty restaurants serving everything from burgers and shakes to Italian fare. The Boardwalk, one of the ship's seven neighborhoods, is a favorite spot for cruisers; it contains casual eateries, retail shops and carnival games.

Harmony of the Seas also has Splashaway Bay, the Ultimate Abyss waterslide and a trio of slides called The Perfect Storm. In the evening, don't miss a pre-dinner cocktail at the Rising Tide Bar, which offers a ride between the Central Park neighborhood and the Royal Promenade with dazzling skylight views. Sit back and sip your drink while the entire bar slowly floats between the decks.

Royal Caribbean Oasis of the Seas

Simon Brooke | Courtesy of Royal Caribbean International

Length: 1,187 feet

Width: 215 feet

Gross tons: 226,838

Maximum passengers: 6,771

Royal Caribbean's Oasis of the Seas was the largest cruise ship in the world when it was launched in 2009. The line's debut Oasis-class ship is nearly five times bigger than the Titanic by gross tonnage; it has 2,801 staterooms and carries 2,109 crew members.

Oasis of the Seas was reimagined in 2019, with many added amenities that are on newer Oasis-class ships, such as FlowRider simulators, the Perfect Storm waterslides, the Ultimate Abyss and Playmakers Sports Bar & Arcade. Across the ship's seven distinct neighborhoods, you'll also find state-of-the-art technology such as VOOM, billed as the fastest internet connection on the high seas – plus exciting live performances and theater productions, laser tag, escape rooms and more.

Royal Caribbean Allure of the Seas

Gross tons: 225,282

Maximum passengers: 6,826

Embarking for the first time in 2010, Allure of the Seas was Royal Caribbean's second Oasis-class vessel. The ship underwent a refurbishment in 2015. Allure of the Seas has 2,748 staterooms and 2,054 crew. Onboard highlights include seven neighborhoods, four pools, and several whirlpools and hot tubs, plus more than 20 dining venues and too many bars and lounges to count.

There are also plenty of entertainment options for guests of all ages, including an ice skating rink, the Sports Court, a nine-deck-high zip line, two rock climbing walls and two FlowRider simulators (a Royal Caribbean favorite). Kids will especially enjoy the interactive H2O Zone Water Park. Adults on this ship will appreciate Broadway productions like "Mamma Mia!," aerial acrobatic performances in Oceanaria (an original AquaTheater production) and '70s disco dance parties. If you find yourself on board for business reasons, rest assured that the ship's conference facilities can host as many as 1,394 guests.

Find a Royal Caribbean cruise on GoToSea.

MSC World Europa

Courtesy of MSC Cruises

Length: 1,093 feet

Width: 154 feet

Gross tons: 215,863

Maximum passengers: 6,762

MSC World Europa was one of the most anticipated new cruise ships when it launched in December 2022 as the first vessel in the line's MSC World-class fleet. It's also the first LNG-propelled ship by MSC Cruises , reaching a maximum cruising speed of 22.7 knots.

The ship's futuristic interior and exterior design features a 341-foot-long promenade. Half the promenade is covered with the Meraviglia-class LED sky screens, while the other half is open-air and offers ocean views. MSC World Europa features 2,626 staterooms and can house 2,138 crew members. As a special touch, each passenger deck is named after an international city, including London, Paris, Lisbon and Rome.

The ship is divided into distinct areas, with a quiet zen district for adults and a family zone that has bumper cars and roller skating. At the fleet's largest onboard water park, younger cruisers will find a twisty, stainless steel tunnel slide towering 11 decks high at the center of the ship. Luna Park Arena, the ship's 300-seat multifunction entertainment venue, can accommodate almost any performance or event.

When you're exhausted from all of the action, grab a bite to eat at one of 13 restaurants or a drink at a selection of bars and cafes. Then, take time to relax and unwind with a signature treatment at the Balinese-inspired MSC Aurea Spa. For an all-inclusive VIP experience during your voyage, book stateroom accommodations in the MSC Yacht Club. This exclusive part of the ship boasts premium suites, a separate pool, a private restaurant and lounge, butler service, and other amenities.

Costa Smeralda

Courtesy of Costa Cruises

Length: 1,106 feet

Width: 138 feet

Gross tons: 185,000

Maximum passengers: 6,554

Costa Smeralda was the first of the two Excellence-class vessels in the Costa Cruises fleet. The vessel debuted in 2019 as the Italian cruise line's largest ship to date. It was also the line's first vessel to use LNG power at sea and in port. The ship has 2,612 staterooms and can carry as many as 1,678 crew members.

Cruisers will never go hungry or thirsty, thanks to the 11 restaurants and snack bars plus 19 bars and lounges on Smeralda . One of the most notable dining venues on board is Archipelago, which serves innovative cuisine created by three world-renowned chefs. If you're interested in culinary pursuits, join other passengers for a cooking class at sea in the Food LAB. When it comes to entertainment, centrally located Colosseo – modeled after the piazzas across Italy – is the place to go for socializing and live performances. What's more, the ship also has 13 pools and hot tubs, an aqua park, the Beauty Spa Solemio, and the Squok Club for kids ages 3 to 11.

Costa Toscana

Costa Toscana, Costa Cruises' newest flagship and the second Excellence-class vessel in the fleet, set sail on its debut voyage in March 2022. Similar in size and passenger capacity to Costa Smeralda, Toscana is also LNG-powered. This vessel has 2,663 staterooms, and there can be up to 1,678 crew members on board.

Similar to Smeralda, Colosseo is the centerpiece of Toscana; you'll find live entertainment and themed bars in this area. There are 11 restaurants and snack bars plus 19 bars and lounges on the ship. For a refreshing aperitif with a view, head to the Aperol Spritz Bar, which features special beach cocktails. Another dining highlight is Sushino at Costa, the line's new sushi bistro. After dinner, take in unparalleled views of the sea along the Volare Skywalk, the highest point of the ship, which towers more than 200 feet above sea level.

Explore Costa Cruises deals on GoToSea.

P&O Cruises Arvia

Courtesy of P&O Cruises

Length: 1,130 feet

Maximum passengers: 5,200

Arvia joined the P&O fleet as sister ship to Iona in December 2022. It is also LNG-powered, has 2,614 cabins and carries up to 1,800 crew. The family-friendly ship offers guests many firsts, including Altitude, a new activity area with an escape room, a high-ropes experience, the Splash Valley aqua zone, the Sports Arena and much more.

Arvia has 30 bars and restaurants. New dining venues include the American-inspired 6th Street Diner and Green & Co. feat. Mizuhana, which focuses on sushi and plant-based dishes. For entertainment, plan to see the line's production of "The Official Take That Musical," an adaptation of London West End musical "The Band." Guests can also head to the dome beneath the SkyDome retractable roof for live performances, aerial displays, movies on the giant SeaScreen and DJ parties under the starry skies.

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Courtesy of AIDA Cruises

Gross tons: 184,600

Maximum passengers: 6,654

The sister ship to AIDAnova, AIDAcosma set sail in early 2022. The partly LNG-powered AIDA Cruises vessel has 2,732 staterooms and the capacity for up to around 1,500 crew members. With 17 restaurants and 23 bars and cafes, AIDAcosma offers passengers a seemingly endless number of venues to dine and imbibe. Other onboard attractions include a four-deck outdoor area, complete with an infinity pool and an expansive area for sunbathing; an indoor playground with a bouldering wall and ropes course; the Body & Soul Spa; and a 360-degree stage at the Theatrium.

P&O Cruises Iona

Length: 1,129 feet

Gross tons: 184,000

P&O Cruises' Iona, which launched in spring 2021, has the distinction of being the first LNG-powered British cruise ship. The family-friendly vessel has 2,614 cabins and carries 1,800 crew members. Iona's top features include the two-story SkyDome, a gin distillery, four pools, 10 entertainment venues, and 30 restaurants and bars offering a wide variety of food and beverage options.

With selections ranging from casual eateries to gelaterias to Indian- and British-inspired cuisine at Sindhu, you won't get bored with the restaurant choices. For an especially unique meal, dine and sip wine while watching aerial performances in the Grand Atrium at The Glass House. Or, enjoy dinner at The Limelight Club, an adults-only supper club venue featuring vocal performances and other live music. After dinner, check out the entertainment around the ship, including aerial productions in the Grand Atrium, guest and crew shows in Headliners, late night dancing in The Club House, and performances in partnership with the entertainment company Creativiva in the SkyDome.

Gross tons: 183,900

When German line AIDA Cruises' first Helios-class ship, AIDAnova, debuted in December 2018, it was the first LNG-powered cruise ship in the world. The ship is equipped with 2,626 staterooms, including the two-deck Penthouse Suite, and carries around 1,500 crew members. You won't miss this ship when it's docked in port: It features the line's signature exterior design, with bold red lips at the ship's bow and blue-and-yellow eyes on the port and starboard sides.

While on board, passengers can check out 17 restaurants, along with 23 bars and lounges; party the night away at the Beach Club; and take in live performances on the 360-degree stage in the Theatrium. When it's time to relax, head to the Body & Soul Spa, where you can book a massage, spend time in one of the hot tubs or saunas, take a dip in the private pool, and chill out on the private spa sun deck.

Carnival Jubilee

Width: 137 feet

Gross tons: 183,521

Maximum passengers: 6,631

Carnival Jubilee, as sister ship to Carnival Celebration and Carnival Mardi Gras, will offer many of the same features and amenities as its two predecessors when it launches in December 2023. The new vessel will have 2,687 staterooms, 1,735 crew and six zones of fun. Currents and The Shores are new to Jubilee . Currents is inspired by the underworld of the ocean with mermaids and sea monsters; it's designed with new bars, restaurants, music venues and high-tech spaces, including a wave-shaped LED ceiling and six LED windows that virtually take guests under the sea. The Shores is all about the outdoors, inspired by beaches and boardwalks. Cruisers can grab a slice of pizza at Coastal Slice, a hot dog at Beach Buns and a cocktail at Marina Bar.

On Jubilee, you'll also find Carnival Cruise Line favorites such as BOLT, the first and fastest roller coaster at sea, as well as Waterworks, the onboard water park with twin racing slides, three spiraling slides and more. The line's "next-level fun" ship will also include familiar eateries and lounges like Shaquille O'Neal's Big Chicken, Guy's Pig & Anchor Bar-B-Que Smokehouse, Cucina del Capitano, Fahrenheit 555 Steakhouse and more.

Carnival Celebration

Courtesy of Carnival Cruise Line

Carnival Celebration sailed its inaugural cruise in November 2022. Carnival's second-newest ship at sea is LNG-powered and the second in the line's Excel class, with 2,687 staterooms and as many as 1,735 crew. Guests will find new attractions to enjoy on the ship, such as the partnership with the Kennedy Space Center at Space Cruisers: This program is designed for children ages 2 to 11 at Camp Ocean.

Adults can check out the new bar at Latitudes, which features specialty cocktails and outdoor scenery through the virtual windows. Celebration has a variety of complimentary dining venues, including Shaq's Big Chicken, Guy's Burger Joint and Mexican favorites at BlueIguana Cantina. There is also a selection of specialty restaurants like Emeril's Bistro 1397, Rudi's Seagrill, the Steakhouse and Bonsai Teppanyaki. For action and 360-degree views of the ocean from the top of the ship, take a spin around the track on the BOLT roller coaster.

Compare Carnival Cruises on GoToSea.

MSC Euribia

Length: 1,087 feet

Width: 141 feet

Gross tons: 181,541

Maximum passengers: 6,327

MSC Euribia, the newest MSC Cruises ship, debuted in June 2023. The line's second LNG-powered vessel – and the fifth Meraviglia-class ship – has 2,419 cabins and can carry as many as 1,711 crew members. The ship's hull features Alex Flämig's artwork "#SaveTheSea" to highlight the company's dedication to preserving the marine ecosystem.

On board Euribia , guests will find five pools and 11 dining venues, offering everything from sushi and teppanyaki to Latin American street food. There are also 21 bars and lounges, the MSC Aurea Spa, the Ocean Cay Aquapark, luxury retail shopping and more. Two additional highlights are the longest – and most impressive – LED Dome at Sea, which covers the ceiling of Galleria Euribia, and the reimagined Carousel Lounge. The beautiful, updated space features floor-to-ceiling windows, outdoor terraces and cozy seating to enjoy live entertainment, including performances by one of the largest big bands at sea.

MSC Virtuosa

Maximum passengers: 6,334

This vessel launched in 2021 as a sister ship to MSC Grandiosa , the line's other Meraviglia Plus-class ship. MSC Virtuosa has 2,421 staterooms and carries around 1,704 crew members. It offers cruisers 11 dining venues plus 21 bars and lounges. At the heart of the ship, Galleria Virtuosa houses the largest shopping area on a cruise ship, with more than 12,500 square feet of retail space. In this area, you'll also find entertainment venues, restaurants and cocktail bars. And don't forget to look up: An impressive LED dome, one of the longest at sea, spans the ceiling of the promenade.

Another highlight to check out during your voyage is the MSC Starship Club, which features Rob, the first humanoid robotic bartender on a cruise ship. The multilingual expert mixologist even tells jokes and will show you a dance move or two. After all the indoor fun, head outside for a cool dip in one of MSC Virtuosa's five pools or take a ride on the slide at the Savannah Aquapark.

Book an MSC Cruise on GoToSea.

Carnival Mardi Gras

Gross tons: 180,000

Maximum passengers: 6,465

One of Carnival Cruise Line's newest ships, Mardi Gras , debuted in July 2021. Its name honors the line's first ship, the TSS Mardi Gras, which launched in 1972. The original Mardi Gras was around 27,000 gross tons and 650 feet long – in contrast, the new Carnival Mardi Gras weighs more than six times as much and is nearly twice as long. This ship also holds the title as North America's first LNG-powered ship. It has 2,641 staterooms and holds up to 1,745 crew members.

Six themed areas each offer unique dining and entertainment experiences. For New Orleans -inspired cuisine, head to the French Quarter; there, you'll find Emeril's Bistro 1396 and The Brass Magnolia, a bar reminiscent of The Big Easy's jazz culture and Garden District. Don't miss one of the ship's top onboard attractions: the BOLT roller coaster, where riders can hit speeds of nearly 40 mph at 187 feet above sea level.

Read: The Top Themed Cruises

MSC Meraviglia

Courtesy of Port Miami for MSC Cruises

Length: 1,036 feet

Gross tons: 171,598

Maximum passengers: 5,655

MSC Cruises' Meraviglia first set sail in 2017 with an impressive 2,244 staterooms and the capacity to carry 1,536 crew members. A dozen restaurants offer a wide variety of cuisines, including a Spanish tapas bar with dishes created by a Michelin-starred chef, Japanese teppanyaki, Italian fare, fresh seafood, steaks and more. There are also 20 bars, lounges and cafes serving everything from Champagne and cocktails to ice cream and crepes.

The central highlight of the ship is Galleria Meraviglia, a 315-foot promenade with eateries, boutiques and evening parties. Nightly entertainment includes live performances and shows in the Broadway Theatre and the Carousel Lounge. Kids will find plenty to do, as well: There's an Aquapark, an F1 simulator, a flight simulator, LEGO play areas, bowling and more. When it's time to wind down, book a signature treatment at the MSC Aurea Spa.

Norwegian Encore

Length: 1,094 feet

Width: 136 feet

Gross tons: 169,116

Maximum passengers: 3,998 (double occupancy)

Norwegian Encore was built in 2019 as one of Norwegian Cruise Line 's Breakaway Plus-class ships. The vessel has 2,040 staterooms and carries 1,735 crew members. There are several complimentary culinary venues on board, including three main dining rooms, The Local Bar & Grill, the Garden Café buffet, and grab-and-go options. Specialty dining restaurants offer a variety of cuisines, from seafood to steak to Japanese teppanyaki.

When it's time for cocktail hour, 14 bars and lounges serve up everything from cold brews to fine wine and whiskey. For a pre-dinner option, head up to the Observation Lounge for panoramic ocean views. Norwegian Encore is also home to several entertainment venues featuring award-winning live shows and performances.

You'll find the most fun on the ship's top decks. First, head to the Encore Speedway race track, which takes thrill-seekers on a heart-pumping ride through high-speed curves extending 13 feet off the side of the ship. Also at the top of the vessel you'll find The Haven: Norwegian's exclusive "ship within a ship" concept boasts luxurious suites, villas and penthouses with balconies. These luxe accommodations include perks like 24-hour butler service, a concierge and a private sun deck.

Find a Norwegian Cruise Line cruise on GoToSea.

Frequently Asked Questions

The largest cruise ship currently in service is Royal Caribbean's Wonder of the Seas, at more than 235,000 gross tons. Icon of the Seas will become the largest cruise ship in the world at 250,000-plus gross tons after its launch, set for January 2024.

Carnival Jubilee, scheduled to debut in December 2023, and Carnival Celebration are the line's largest ships at 183,521 gross tons.

The line's largest ship is Disney Wish at about 144,000 gross tons. The vessel is 1,119 feet in length and 128 feet wide; it has 1,254 staterooms and carries up to 4,000 passengers and 1,555 crew.

Why Trust U.S. News Travel

Gwen Pratesi has been an avid cruiser since her early 20s. She has sailed on nearly every type of cruise ship built, including the newest megaships, paddle-wheelers on the Mississippi River, and an 18-stateroom river ship on the Mekong River in Vietnam and Cambodia. She has also cruised on a traditional masted sailing ship and on a small luxury expedition vessel in Antarctica crossing the notorious Drake Passage twice. She covers the travel and culinary industries for major publications including U.S. News & World Report.

You might also be interested in:

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• The Top Cruise Insurance

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Full List: The 10 Current Largest Cruise Ships on the Planet

If you think cruise ships have gotten bigger, it’s not just your imagination. Whereas a ship built in the 1990s might hold 2,500 passengers and come in at around 75,000 gross tons (a measure of ship size), that’s nowhere near the ships built today.

Today, any new ship from a major line will be at least 140,000 gross tons, with many much larger than that. Passenger counts have also swelled, with many new ships carrying 5,000 cruisers when completely full.

But the largest cruise ships on the planet are in another league altogether. They can measure up to 250,000 gross tons (roughly triple the size of a ship built 30 years ago!) and when at full capacity with crew, have nearly 10,000 people onboard.

Why Are Cruise Ships So Big?

Truth be told, while the size of massive modern ships is staggering, not everyone likes the large ship experience. Some people can find them too crowded and too hard to navigate. But not everyone feels that way, and cruise lines have invested literally billions into building ships that are as large as possible. So what is the appeal of a mega ship?

Amenities/Activities: For passengers, the big advantage of size comes with everything that can be fit onto the ship. Instead of the old days where there was a pool, some loungers, and a buffet, modern mega ships are literal resorts at sea.

There are multiple pools, more than a dozen restaurants, casinos, ziplines, literal parks, ice-skating rinks, rock-climbing walls, spas, and more bars than you can count on your fingers and toes.

All of that combines into an experience that can exceed expectations and keep passengers coming back for more.

Efficiencies of Scale: For cruise lines, one big positive about a larger ship are greater efficiencies. Instead of having the cost of building two smaller ships — and the costs of having two sets of crew to run them both — one larger ship offers the chance for just as many passengers at a lower cost.

Marketing: Finally, one overlooked aspect of why cruise ships are bigger than ever has to do with marketing and publicity. There’s a certain awe and interest that comes with the world’s largest ships. Seeing them in port is essentially a giant billboard for a cruise line. And the largest ships also get significant press due to their size. All of that can translate into more interest, ticket sales, and prices for the newest — and biggest — ships.

With that in mind, here is the current list of the world’s largest cruise ships as of now…

Icon of the Seas

When it comes to the largest ships, Royal Caribbean is the undisputed leader with the six biggest cruise ships in the world. But the king of the fleet — and the largest cruise ship in the world — is Icon of the Seas .

Icon of the Seas doesn’t sail with passengers until 2024, but it’s already made waves. It’s not just the massive size (250,800 gross tons and 7,600 passengers at maximum capacity), but what’s onboard. A full-fledged waterpark, seven different pools, and eight different neighborhoods offer a spot for everyone. This ship looks to change cruising forever.

• Gross Tonnage: 250,800
• Length: 1,198 feet
• Passenger Capacity: 5,610 double occupancy; 7,600 max capacity
• Year Built: 2023

Wonder of the Seas

Wonder of the Seas is the latest edition of Royal Caribbean’s Oasis-class ships (until Utopia of the Seas arrives in 2024), which were the largest class in the world until the new Icon class took the torch. Still, it’s not as if Wonder of the Seas is a slouch.

At 235,600 gross tons, there’s room for 7,084 passengers and an amazing amount to see and do onboard. This includes Central Park, the mid-ship outdoor promenade that winds through lush gardens, and the AquaTheater, where performers put on aquatic shows, including towering high dives at sea.

• Gross Tonnage: 235,600
• Length: 1,188 feet
• Passenger Capacity: 5,734 double occupancy; 7,084 max capacity
• Year Built: 2022

Symphony of the Seas

Each iteration of Oasis-class ships has arrived just slightly larger than the previous when it comes to gross tonnage. That means they each had their time as the largest in the world before another arrived on the scene. In this case, Symphony of the Seas (228,000 gross tons and the ability to hold 6,680 passengers) took the crown in 2018.

Today, it’s the third-largest cruise ship on the planet, but it’s no slouch. It holds seven different neighborhoods, nearly 3,000 staterooms, three waterslides, and Ultimate Abyss — a 10-story dry slide.

• Gross Tonnage: 228,081
• Passenger Capacity: 5,518 double occupancy; 6,680 max capacity
• Year Built: 2018

Harmony of the Seas

Built in 2016, Harmony of the Seas features 18 decks, more than 225,000 gross tons (about 10% smaller than Icon of the Seas) and can carry nearly 6,700 passengers when completely full. That’s good enough to make it the fourth-largest cruise ship in the world.

It features many of the same components of other ships in the class, like the adults-only Solarium, Central Park, and the AquaTheater. That’s not to mention 17 different spots to grab a bite to eat.

• Gross Tonnage: 226,963
• Passenger Capacity: 5,479 double occupancy; 6,687 max capacity
• Year Built: 2016

Oasis of the Seas

The ship that started the trend of truly mega ships is also the namesake of the Oasis class — Oasis of the Seas. If you notice, most of the largest ships on our list were built recently. This ship first began sailing in 2009 and set off the “arms race” of larger ships that continues today.

Following a refurbishment, it now features three waterslides, a dozen lounges, 2,801 cabins (including one with a panoramic view right above the ship’s bridge), a splash pad for kids, and even an escape room themed like the 1960s NASA mission control. And did we mention 20 different places to find something to eat?

• Gross Tonnage: 226,838
• Length: 1,187 feet
• Passenger Capacity: 5,602 double occupancy; 6,771 max capacity
• Year Built: 2009

Allure of the Seas

Following a refurbishment of Oasis of the Seas, Allure of the Seas — which was the second ship in the class and built in 2010 — is actually now the smallest of the group based on tonnage. Still, that’s good enough for sixth largest in the world at “just” 225,000 gross tons.

On the ship, you’ll find 18 decks, 2,748 staterooms and more than 6,800 passengers when completely full. That’s definitely a lot of people, but remember that you also have a lot more space to spread out, giving plenty of elbow room.

• Gross Tonnage: 225,282
• Passenger Capacity: 5,496 double occupancy; 6,826 max capacity
• Year Built: 2010

MSC World Europa

While Royal Caribbean has a lock on the largest ships, the title of largest cruise ship from outside that cruise line goes to MSC World Europa.

Coming in at almost 216,000 gross tons, it’s roughly 14% smaller than Icon of the Seas. But don’t think it’s some slouch. From bumper cars to seven pools to an 11-story slide, there’s no shortage of things for kids to do. Adults will love the 13 different dining options and an indoor promenade or Panorama Lounge for shopping, having a drink, or just relaxing.

This ship will be joined in 2025 by sister-ship MSC World America, set to sail stateside.

• Gross Tonnage: 215,863
• Length: 1,094 feet
• Passenger Capacity: 5,231 double occupancy; 6,762 max capacity

Costa Smeralda/Costa Toscana (Tie)

These two ships come in at a tie for the eighth-largest cruise ship in the world. Built in 2019 and 2021, respectively, they both belong to Costa Cruises. And if the shape of the ship looks familiar, that’s because Costa is a sister line to Carnival. A similar design is used for Carnival’s largest ships, Mardi Gras, Celebration, and Jubilee. However, those ships come in just under the 185,000 gross tons seen with Smeralda and Toscana.

Both ships offer 13 pools and hot tubs, nearly a dozen restaurants and just under 20 bars and lounges. And if you like balcony views? There are 1,550 balcony rooms on each, providing plenty of options for the roughly 6,500 passengers that can sail at full capacity.

• Gross Tonnage: 185,010
• Length: 1,106 feet
• Passenger Capacity: 5,224 double occupancy; 6,554 max capacity
• Year Built: 2019/2021

P&O Arvia

Taking the crown as the 10th-largest cruise ship in the world is Arvia from P&O Cruises. Measuring just under 185,000 gross tons, it offer a similar design to ships like Costa Smeralda and Carnival Celebration, but don’t think these ships are all the same.

For instance, Arvia features a unique Skydome area that is a pool area with retractable roof by day and an entertainment venue by night. It also features its own rum distillery onboard, meaning you can take home rum literally made on the ship. Kids will love the Altitude zone that features a ropes course, mini-golf, and more. There’s also Mission Control, a submarine-themed escape room.

All told, a reported 6,685 passengers can enjoy the ship at one time.

• Gross Tonnage: 184,700
• Length: 1,130 feet
• Passenger Capacity: 5,200 double occupancy; 6,685 max capacity

More on Large Ships:

• The World’s Largest Cruise Ship Compared to Famous Places
• The World’s Largest Cruise Ships Sailing For Each Line (With Photos)
• Photos: See the New Icon of the Seas Sail for the First Time

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[Updated] Cruise Ships With the Best/Worst Space to Guest Ratio: 8 Cruise Lines Compared

I compared 141 cruise ships from 8 major cruise lines to see which offered the most space based on passenger capacity and ship volume.

*This post has been updated from its original writing and reflects the latest cruise ships to enter the market, including cruise ships that will debut in the next year.

While many factors can have an impact on how crowded a ship may feel, there is a simple formula for figuring out the passenger space ratio.  Additionally, this allows us to compare different ships by the same metric and see how it compares with out experience on the ship.

Related: What is the best cruise line for you?

How the passenger space ratio was calculated on our chart

The formula for the passenger space ratio is simply the gross tonnage (GT) of a cruise ship divided by the passenger capacity of that vessel  (Gross Tonnage ÷ passenger capacity).  In our list we used the standard double-capacity for each ship.  

It’s important to understand that some lines may more commonly exceed the double-capacity figures especially if it’s more usual for families to travel with that line.  Likewise, since the exact number of passengers on a cruise at any given time will be different it’s important to note that this part of the equation should be somewhat flexible.

Related: Cruise ships with the best passenger to cruise ratio (mainstream lines)

What is gross tonnage anyway?

A common misconception is that the gross tonnage of a cruise ship is a measurement of weight.  However, it has nothing to do with weight at all.  In fact, gross tonnage is a unitless measurement of the volume or space of a cruise ship and includes all of the enclosed spaces of the vessel.  This is an important factor, as some areas of a ship’s open-air decks will not be included in the figure.

How else is gross tonnage used?

Ever wonder why some ship’s have bigger fees than others?  Well, the gross tonnage plays a factor.  The overall GT of a ship determines things like registration fees, regulations, safety rules and port dues, depending on each individual port.

Some of the largest cruise ships in the world belong to Royal Caribbean Cruises and have a gross tonnage of over 200,000. In fact, Utopia of the Seas will have a massive GT of 236,860.

Read more: The true cost difference between a balcony cabin and interior stateroom

Other important factors

While using the passenger space ratio can be a simple way to compare ships and how crowded they may feel, it’s not a perfect measurement.  Factors like the overall flow of a ship’s design, how the programs are spaced out, the times in which various events take place, and the demographic of a ship all play a greater role in the feeling of being crowded on a cruise ship.

Additionally, depending on what you like to do on a cruise you might have a vastly different experience than someone else on the very same cruise simply based on what times you took part in different programs, shows, and meals.

So, this list is just a fun way to compare ships based on space and capacity.

I have sorted each cruise line separately so you can compare ships within a specific line , which I think personally is a more accurate way to compare how crowded a cruise ship may or may not feel.  This is simply because each cruise line handles passenger flow differently. 

At the end of the page I have also listed all 141 cruise ships in a chart so you can compare all of them at the same time.  The lists below include the following cruise lines: Carnival Cruise Line, Royal Caribbean Cruises, Norwegian Cruise Line, MSC Cruises, Princess Cruises, Celebrity Cruises, Disney Cruise Line, and Holland America Cruises.

The larger the number in the right hand column the more spacious a ship may feel. At least that’s the idea. A number in the 20’s would feel crowded and cramped while a number in the high 40’s and above may feel spacious.

 The cruise ships below are sorted by the space/passenger ratio. The higher the number the more space per passenger is available on the ship.

Carnival Cruise Line: ships by passenger space ratio

See our list of every Carnival cruise ship currently in service in order of newest to oldest here .

Royal Caribbean Cruises: ships by passenger space ratio

Royal Caribbean cruise ships in order from newest to oldest.

Norwegian Cruise Line: ships by passenger space ratio

See every Norwegian Cruise Line cruise ship in service from newest to oldest here .

MSC Cruises: ships by passenger space ratio

See all MSC Cruises cruise ships in order from newest to oldest.

Disney Cruise Line ships by passenger space ratio

Note: There are two different numbers for capacity on Disney. The first number is for double capacity and the second is for maximum capacity. I thought it was important to have both since many Disney cruises have families with more than 2 occupants in a cabin.

Princess Cruises: ships by passenger space ratio

See all Princess Cruises ships from newest to oldest.

Celebrity Cruises: ships by passenger space ratio

Holland america cruises: ships by passenger space ratio.

The below section is a list of all the above ships in one table. These are again listed in order from least spacious to most spacious based on our passenger space ratio formula.

All 141 Cruise ships by passenger space ratio: sorted least to greatest

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Largest Cruise Ships

See here the world's largest cruise ships list (including vessels under construction ) owned by the best cruise line companies . This article is also integrated with our ship dimensions , passenger capacity , and old cruise ships surveys.

CruiseMapper's list of biggest cruise ships includes all vessels with gross tonnage/volume over 150,000 GT-tons .

Each one of these behemoth ships is an engineering marvel produced by our contemporary age of fun and super technologies. Kudos to their builders and double kudos to their proud owners who have invested so much in these newbuild projects!

Note: In the following table, all links are internal (CruiseMapper) and redirect to the liner's itinerary schedule where you can compare dates and prices per person (double occupancy cabin rates).

The world's largest river cruise ship is Victoria Sabrina . The 2020-launched riverboat is China-built, owned by Victoria Cruises China and deployed year-round on Yangtze River. The vessel has the impressive volume of 17000 GT-tons, LOA length 150 m (492 ft), width 22 m (72 ft), 7 decks (5 with cabins), 270 staterooms, max capacity 690 passengers plus 195 crew/staff.

Oasis-class - biggest cruise ship in the world ever built

World's currently largest cruise ship class is produced exclusively for RCI-Royal Caribbean andin 2 sub-series - Oasis-Class (Allure OTS, Oasis OTS) and Oasis-Plus (Harmony OTS, Symphony OTS, Wonder OTS). These are sisterships from the fleet of the second- largest cruise shipping company in the world - RCCL-Royal Caribbean Cruises Ltd (as shipowner) that follows only Carnival Corporation (as shipowner).

As to vessels' dimensions, each boasts the unimaginable weight of 227,000-230,000 GT / gross tons, LOA length 362 m (1187 ft) and waterline width 47 m (154 ft). The extreme breadth is over 60 m (198 ft). As the GT is a volume measurement, the ship's actual mass (called displacement) is approx 100,000 tons (the hull alone weighs about 54,000 tons). Surpassing all passenger ship standards, building cost and all previous ship travel vacation concepts, the Oasis-class ships are currently the only passenger shipping vessels of such immense size.

Other interesting numbers are the above waterline height (72 m / 236 ft), depth (23 m / 74 ft below waterline), 16 passenger decks, draft/draught (9,3 m / 31 ft), cruising/service speed 23 knots (26 mph / 42 kph), capacity 5400 passengers at double occupancy (max 6296 / 6870) and officers+crew capacity 2165.

The world's biggest cruise ship propulsion system guarantees the perfect maneuverability by 3 rotatable Azipod thrusters (suspended under the ship's stern), each with a huge electric motor and a 6 m (20 ft) propeller. The ship offers great stability due to its enormous size. And in times of need - there are 18 lifeboats, each with a capacity of 370 people.

Oasis-Plus class is also currently the world's most technologically advanced and energy-efficient cruise vessel ever built. It is equipped with a new-generation exhaust gas cleaning system (multi-stream scrubbers) and with a hull lubrication system allowing the ship to float on air bubbles (created around the hull) thus reducing drag and increasing fuel efficiency.

Regarding cruise accommodations , this class of vessels has some of the largest suites at sea - measuring 150 m2 (over 1600 ft2, balcony included). Another signature feature is the 7 "neighborhoods" (theme-park-like areas), 5 large swimming pools, a huge casino, a full-size volleyball/basketball court, large-capacity bars, and lounges. Oasis-Plus ships additionally have waterslides (created by Aquatic Design & Engineering) and a total of 23 "water fun" areas (swimming pools, large-size outdoor jacuzzies, waterslides, flowriders/surf simulators). The stern-located Ultimate Abyss water slide is 150 ft (45,70 m) above sea level. It features 31 sections, two 360-degree circles, 27-degree slide incline, 28 m (92 ft) serpentine-like drop, 13,14 seconds average sliding time (top to bottom), around 300 small LED lights and graffiti artworks throughout.

These phenomenal ships were manufactured by STX Europe (shipyard Turku Finland / Oasis-class) and in by STX France (shipyard Saint-Nazaire France / Oasis-Plus). The new Oasis ships are 2,15 m (7 ft) longer.

Biggest Carnival cruise ship - "Carnival Pinnacle" class

Watch this amazing YouTube video about the "Carnival Pinnacle cruise ship". The project was designed by the Italian shipbuilder Fincantieri as their biggest ever passenger ship - GT tonnage 200,000 tons, capacity 6000 passengers, length 380 m (1246 ft), The "Pinnacle Project" was initiated by Carnival Corporation in 2004 to tip the scales in the "Carnival vs Royal Caribbean" competition.

Carnival Pinnacle was never built as the project was officially canceled (mainly due to the vessel's incredible cost at that time). However, many of the project's elements and innovative design features were later adapted for other large-sized cruise liners built for rival companies.