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The top 25 largest yachts in the world

Every year, shipyards from around the world push the boundaries of superyacht design to deliver bigger and better yachts. The Samuda-built El Mahrousa may have carried the title unchallenged for a remarkable 119 years, but in the 21st century, she has descended down the pecking order to make room for even larger and longer yachts. German shipyard Lürssen currently holds a near monopoly in the construction of supersized superyachts, having delivered 13 of the world’s top 25. But the list is ever-changing with the 158 metre Blue breaking into the top five in 2022. These yachts, all measuring over 100 metres, are impressive not only for their hull length but for what they carry above and below deck. From submarines and helicopters to swimming pools , cinemas and science labs, the onboard features of these superyachts show them to be truly ground-breaking pieces of engineering. Read on to discover our official list of the largest, privately owned yachts in the world.

1. Azzam | 180.6m

In October 2013, Lürssen delivered the largest privately owned superyacht in the world in the form Azzam . Originally, she was designed to be 145 metres, but in the process of optimisation grew to 180 metres. Other stunning facts about Azzam’s impressive design include her staggering 13,000 GT and accommodation for 36 guests and as many as 80 crew members. The behemoth was reportedly built for Sheikh Khalifa bin Zayed al-Nahyan of Abu Dhabi’s royal family, for use as a dayboat to reach his favourite diving grounds. The main saloon alone encompasses nearly 522m² and has a relaxed French Empire style and mother of pearl finishes, designed by Christophe Leoni . On board features include a gym, pool and a special ‘golf training room’.

Exteriors have been penned by Nauta Yacht Design , and the technical engineering was directed by Mubarak Saad al Ahbabi for the owner. The yacht has an impressive speed for her size owing to her innovative water-jet propulsion system (two fixed jets, two directional), which catapults her along at a staggering 31.5-plus knots. At 17.5 metres longer than Roman Abramovich’s Eclipse , this boat takes the prestigious title of the world’s largest yacht. The all-white superyacht has held her title unchallenged for nearly seven years, but this reign will come to an end with the expected delivery of 183 metre REV .

• Builder: Lurssen
• Country of build: Germany
• Delivery year: 2013
• Length Overall: 180.61 m
• Gross Tonnage 13136 t

More about this yacht

More stories, 2. eclipse | 162.5m.

After five years of intensive design, development and construction, Eclipse left the Blohm + Voss yard in December 2010. She carried the title of world’s largest superyacht for just three years before being usurped by Azzam . Managed by Blue Ocean Yacht Management, Eclipse features a diesel-electric propulsion system with generators powering rotating Azipod drives, dramatic exterior styling and a stunning interior design by London-based Terence Disdale Design , which has been responsible for all aspects of aesthetic design and layout, including the superstructure design, deck layouts, interior design and construction supervision. Eclipse was voted Motor Yacht of the Year at the World Superyacht Awards in 2011 and Motor Yacht of the Decade at the 10th World Superyacht Awards in 2015.

Her accommodation includes an owner’s deck of 56 metres in length and facilities for up to 92 crew. Her interior boasts hundreds of custom finishes exclusively developed especially for this project, while her deck areas include a 16 metre swimming pool which can be transformed into a dance floor. The yacht can also accommodate three helicopters, one on each of the two helipads and the third in a storage hangar below the fore deck.

• Builder: Blohm & Voss
• Delivery year: 2010
• Length Overall: 162.5 m
• Gross Tonnage 13564 t

3. Dubai | 162m

Dubai was originally commissioned by Prince Jefri of Brunei with exterior styling and interior design by Andrew Winch . The Blohm & Voss project was suspended in 1998 with just the bare hull and partially complete superstructure. It was eventually sold to the Dubai government, and responsibility passed to Kostis Antonopoulos of Platinum Yachts , which prepared a new in-house interior design completed in 2006.

The aptly named Dubai is the royal yacht of Sheik Mohammed bin Rashid al-Maktoum of Dubai. The accommodation, styled by Nakheel Interiors , is designed for 24 guests and comprises an owner’s suite, five VIP suites and six guest suites, all with open balconies. Special features include a 21.3m-wide atrium, a swimming pool, barbecue area, cinema, disco, a landing platform for a Blackhawk helicopter, a gymnasium, and a garage for the yacht’s submarine and a vast array of water toys. Full certification was obtained from Lloyds Register of Shipping in October 2006 and she has since made several voyages. She can reach a maximum speed of 25 knots.

• Builder: Platinum
• Country of build: United Arab Emirates
• Delivery year: 2006
• Length Overall: 162 m
• Gross Tonnage 12488 t

4. Blue | 158m

Taking her place at number four in the list of the world’s longest yachts, Lürssen’s Blue is so voluminous that she beats all the longer boats in terms of gross tonnage. Built for a Middle Eastern owner, she is exceeded for internal space only by those behemoths Dilbar (15,917GT) and Al Said (15,850GT). Terence Disdale has penned classic exterior lines with a sharply raked bow and gentle curves to the deep overhangs of the decks. The main helipad is positioned on the bow, with a smaller one aft. Other exterior features include a pool under cover on the main deck aft, a bathing platform at the stern and twin balconies flanking the owner’s cabin forward. Blue ’s interior is designed to be timeless and rich in “feminine elegance”, a deliberate contrast to the exterior. 

Blue is equipped with a diesel-electric hybrid propulsion system that was developed in-house. An electric Azimuth pod drive can manoeuvre the boat alone or in conjunction with the twin propeller shafts. To reduce noise, vibration and NOx levels, Blue has a state-of-the-art exhaust treatment system. The boat is also equipped with new membrane technology that means her treated waste water achieves drinking water quality.

• Delivery year: 2022
• Length Overall: 160.6 m
• Beam: 22.5 m
• Gross Tonnage 14785 t

5. Dilbar | 156m

With a total interior volume of over 15,000 GT, Dilbar is the largest yacht in the world by gross tonnage, if not by length. She was built in steel and aluminium by Lürssen to a design by Espen Øino . In 2016, she was delivered in the Mediterranean for her owner, the Uzbekistani billionaire Alisher Usmanov. She replaced Usmanov’s previous yacht of the same name, which has since been renamed Ona . She is usually spotted cruising around the South of France, northern Spain and sometimes Cyprus.

Record-breaking features on board this SOLAS-class superyacht include her 180 cubic metre swimming pool and her 30,000KW electric diesel power plant. Her interiors, styled by Winch Design, can accommodate up to 24 guests served by nearly 100 crew members. She also has two helipads, 3,800 square metres of living space amd an expansive garden complete with a specially developed variety of grass that tolerates salt air, according to its creator Axel Massmann. Dilbar has a single colour for her exterior, a buttery cream shade, that makes her instantly recognisable at sea and can reach a top speed of 21 knots.

• Delivery year: 2016
• Length Overall: 156 m
• Beam: 23.5 m
• Gross Tonnage 15917 t

6. Al Said | 155m

This Lloyd’s-classed vessel, known as Project Sunflower during construction, was delivered by Lürssen’s Vegesack yard to her owner, Sultan Qaboos bin Said Al Said of Oman, in March 2008. Measuring an impressive 155 metres, Al Said is the principle vessel of the Oman Royal Yacht Squadron. Designed by Espen Øino with the looks of a classic cruise liner, she sails under the Omani flag and her home port is Muttrah Harbour in Muscat. 

This Germanischer Lloyd-classed, 15,850GT yacht can reach a top speed of 25 knots and is reported to have a crew capacity of 150. Her panelled interiors, designed in a traditional style by Jonathan Quinn Barnett , offers huge entertaining spaces and accommodation for 65 guests. Her pièce de résistance is the on-board concert hall that can accommodate a 50-strong orchestra, but across her six decks she also has a helipad and a cinema.

• Delivery year: 2008
• Length Overall: 155 m
• Gross Tonnage 15850 t

7. El Mahrousa | 150.6m

El Mahrousa was first delivered by the Samuda Brothers shipyard in 1865. She held on to the title of longest yacht in the world for over a century before finally being usurped by the delivery of Prince Abdulaziz in the 1980s. She was originally built for the Ottoman governor of Egypt, Khedive Ismail, receive visiting dignitaries. and was present at the opening ceremony of the Suez Canal in 1869, when she was used to receive visiting dignitaries. She was lengthened by 12.1 metres in 1872, when her paddle wheels were removed, and by a further 5.2 metres in 1905. Her last major rebuild was in 1950.

Significant moments in her lifetime include her participation in 1976 as the Egyptian representative at the Bicentennial Fleet Review in New York harbour. She slipped into disrepair after this while being used as a museum ship. In 1992, a major effort was put into making her seaworthy enough to travel to Italy for the Christopher Columbus Fleet Review. She now serves as the Egyptian Presidential Yacht but is seldom seen in public. She is usually berthed in Alexandria, where she is cared for by the Egyptian Navy, which lists her as a training ship. Powered by three Parsons steam turbines, she can achieve a top speed of 16 knots.

• Builder: Samuda
• Country of build: United Kingdom
• Delivery year: 1865
• Length Overall: 150.57 m
• Beam: 12.98 m
• Gross Tonnage 4560 t

8. A+ | 147.3m

Formerly known as Topaz , the Tim Heywood -designed A+ was launched by Lürssen in 2012 and uniquely features Heywood’s signature illuminated on her superstructure. Although she flies a Cayman flag, her owner is a member of the UAE elite – reportedly Sheikh Mansour bin Zayed al-Nahyan, who also owns the UK’s Manchester City football club.

Having previously been chartered twice by Hollywood actor Leonardo DiCaprio, the 147.25 metre superyacht features a helicopter landing pad located at the bow and her interiors have been designed by Terence Disdale – but not much else is known about this superyacht, as many of her details are still shrouded in secrecy.

• Delivery year: 2012
• Length Overall: 147.25 m
• Beam: 21.5 m
• Gross Tonnage 12532 t

9. Prince Abdulaziz | 147m

The 5,200-tonne Prince Abdulaziz was delivered by Danish shipyard Helsingor Vaerft in 1984 to her first owner, King Fahd of Saudi Arabia. Since then, she has continued to serve the Saudi royal family and is berthed beside the king’s palace in Jeddah. She has been refitted three times; in 1987, 1996 and in 2005.

Prince Abdulaziz was built at a reported cost of $184m to a design by Maierform . Her interior, designed by the late David Hicks , blends ancient and modern. One notable feature is the large lobby, said to be designed to mimic that of the Titanic . She includes a hospital, a mosque and a cinema, and there are also rumours of surface-to-air missiles and an underwater surveillance system on board. The mega yacht can accommodate as many as 64 guests and is manned by a crew of 65.

• Builder: Helsingor Vaerft
• Country of build: Denmark
• Delivery year: 1984
• Length Overall: 147 m
• Beam: 18.3 m
• Gross Tonnage 8233 t

10. Opera | 146.4m

Reportedly built for a senior Emirati royal, Opera 's size and gross tonnage catapult her directly into the ranks of the world's 10 biggest private yachts. The 146.4-metre yacht certainly has some of the hallmarks of a Middle Eastern boat, with deep overhangs between decks and lots of enclosed deck space hinting at use in an aggressive climate. Pictures taken during a maiden voyage from Bremen to Portsmouth last summer showed lots of floor-to-ceiling glass across six guest decks, as well as two helicopter landing spots and a beach club whose twin staircases must climb two decks to reach a 10-metre, stone-lined pool aft of the main deck. The pool rises to form a dance floor.

Lürssen has kept the project shrouded in secrecy, but designer Terence Disdale confirmed that interior facilities include a cinema and an extensive spa and wellness centre, plus other features that are being kept under wraps. He also mentioned an upper lounge with a 110-inch television and bay windows.

• Delivery year: 2023
• Length Overall: 146.35 m
• Gross Tonnage 12518 t

11. OK | 146m

This unusual vessel spent decades plying the seas as a float-on yacht carrier for DYT Yacht Transport with the unglamorous moniker Super Servant 3 – and it is this carrying ability that caught the owner’s eye.

40 years after its original launch by Japan’s Oshima Shipbuilding , the yacht emerged from a root-and-branch refit at Karmarine in Turkey. The exterior has been smartened up, with a new matt-black paint job, gold-tinted glazing, teak decking at the bow, stern and sides and an expanse of artificial grass on the submersible aft deck – an idea of the owner’s, to enliven the guest cabins’ view. There are reports that this space doubles as a tennis court and, at 32 metres by 100 metres, there would certainly be the room for it.

With a strengthened hull, the boat’s original role as a yacht carrier has been enhanced. Pumping ballast into tanks under the aft deck allows the platform to lower so that the owner’s 46-metre ketch can be floated aboard and secured. There’s also a 40-tonne crane for positioning other toys – reportedly up to 70 of them, from launches and cars to a seaplane.

Under the direction of Bozca Design , Karmarine has stripped out and rebuilt the accommodation area at the front of the yacht. There are cabins for up to 20 guests, a glazed sundeck spa pool, a "botanical" garden and an outdoor cinema. The lift between decks runs through a glass tower outside the superstructure. 

• Builder: Oshima Shipbuilding
• Country of build: Japan
• Delivery year: 1982
• Length Overall: 146 m
• Beam: 32.01 m
• Gross Tonnage 11296 t

12. Sailing Yacht A | 142.8m

This Philippe Starck -designed vessel is the second superyacht commissioned by Russian businessman Andrey Melnichenko, after his first Motor Yacht A . She was built in Germany by the Nobiskrug yard and delivered in February 2017.

A sail-assisted yacht like no other, Sailing Yacht A comprises eight decks, and her rotating curved carbon fibre masts tower to 100 metres. She is made to set 3,747 square metres of sail and is manned by crew of 54. She sports an underwater viewing pod (moulded into the keel) and balconies enclosed by the largest pieces of curved glass ever. There are 24 shell doors in her hull, and she has a diesel-electric power plant controlled by computer. Records claimed by the Starck superyacht include the world's tallest carbon masts, with the tallest standing at 100 metres above sea level.

• Builder: Nobiskrug
• Delivery year: 2017
• Length Overall: 142.81 m
• Beam: 24.88 m
• Gross Tonnage 12700 t

16. Scheherazade | 140m

Another titan by Lürssen , Scheherazade carries the same name as the enigmatic story-teller of the Middle Eastern epic One Thousand and One nights . She hit the water in July 2019 and offers phenomenal volumes at 10,167 GT. Her Espen Øino exterior features a four-deck aluminium superstructure with elegant tapering roofs and an eclectic range of coloured LED exterior lighting. She also has two large helipads – one at the bow and one on the upper deck – plus a prominent beach club aft. 

There is very little information regarding her interior by François Zuretti , but if the work of the French design house on 106-metre Amadea is anything to go by, it is imperious and sophisticated. With the owner known to be a Middle Eastern billionaire, this yacht is designed with warmer climates in mind. Temperatures in excess of 45 degrees Celsius are quite normal in the region during the summer months, so Scheherazade has relatively little exterior space for a yacht of this size. There is limited covered deck space at the aft end of the main and upper decks, but it is well enclosed by glass sides for cooling. Even the sundeck is completely shaded by a hardtop, which all helps to give her an astonishing internal volume.

• Delivery year: 2020
• Length Overall: 141.96 m
• Beam: 23.3 m
• Gross Tonnage 10167 t

13. Nord | 142m

Nord started life as Project Redwood, then Opus. Everyone involved in her design and build has remained tight-lipped about the details, but build manager Rob Moran shared some exclusive insight with BOAT International .

First up, she has an Ice Class hull for real exploration. Her aluminium superstructure runs to four decks, contained within the dramatic sweep of a black-painted arch – a key part of the vision of designers Nuvolari Lenard . Not one but two helipads are in evidence, while a vast beach club and tender garage gives  "space to store a plethora of toys including 16 tenders, a submarine and an ROV", according to Moran. The largest tender reportedly measures 15 metres, and there is a watersports and dive centre on the lower deck. Nord has a generous touch-and-go helipad at its heavily flared aircraft carrier bow, but there is also a much bigger space aft up on the bridge deck that offers landing, parking and bunkering for the owner’s helicopter, as well as an entire hangar for protection during longer passages. 

Also visible to onlookers was the exceptional 25-metre-long swimming pool on the main deck aft, plus a spa pool on the upper deck. Her interior is reported to include a gym, spa, sauna and a whole deck devoted to the owner.

• Delivery year: 2021
• Length Overall: 141.6 m
• Beam: 19.5 m
• Gross Tonnage 10154 t

14. Yas | 141m

Delivered in 1978 by De Schelde as a navy frigate, Yas was rebuilt in 2013 by Abu Dhabi MAR. Previously known under the project name Swift 141, she was completely modified with new machinery and electronic systems and outfitted with a luxurious interior. It has been suggested that her owner is a member of the Emirati royal family.

She has been designed inside and out by Pierrejean Design Studio of Paris . The unique superstructure of Yas is built in advanced composites and glass and was supposedly inspired by the profile shape of a dolphin. She is reportedly able to accommodate 60 guests and 56 crew, and on-board features include a heli-pad and al fresco dining spaces aft, and a Jacuzzi on her top deck. Her beach club Jacuzzi is complemented by a waterfall feature and a spiral staircase connects her the multiple decks. Powered by twin MTU diesels, Yas has a top speed of 26 knots.

• Builder: De Schelde
• Country of build: Netherlands
• Length Overall: 141 m
• Beam: 14.6 m
• Gross Tonnage 5002 t

15. Ocean Victory | 140m

Ocean Victory was completed at Fincantieri’s Muggiano yard in Italy after launching in April 2014. This seven-deck yacht is based on a design by Espen Øino and her interior is by Alberto Pinto and Laura Sessa . She has internal seawater dockage for a 14-metre tender and six pools of up to 8 metres in length. There’s a certified helideck and a hangar to store the aircraft, while inside Ocean Victory boasts an underwater observation room and more than 300 square metres of spa facilities. She is SOLAS-classed and is the largest yacht ever built in Italy. 

In 2016, the superyacht world was shocked and saddened to hear of the death of one of Ocean Victory’ s crew members, who suffered critical leg injuries while setting the anchor off the coast of Mu Ko Similan National Park in Thailand. Little else is known about this top-secret yacht, which is kept much under wraps and away from prying eyes.

• Builder: Fincantieri
• Country of build: Italy
• Delivery year: 2014
• Length Overall: 140 m
• Gross Tonnage 8506 t

17. Solaris | 140M

The 140-metre expedition yacht Solaris was launched in the city of Bremerhaven in February 2021 as the flagship model of German shipyard Lloyd Werft . She is the debut project of Australian designer Marc Newson , who has given her a dramatic grey and white superstructure which features a unique fashion plate which wraps around the mast and connects both sides of the hull. Spanning eight decks in total, Solaris has been constructed in aluminium and steel and offers a 26-metre beam. Little information has been shared about her interiors, but her exterior is equipped with a large helipad, a sun deck and a spacious beach club aft.

Turning to the technical elements, Solaris is reportedly outfitted with a power and energy management system from ABB and features two Azipods powered by nine megawatts – the most powerful propulsion system of its kind to ever be installed on a yacht. She runs on a total of eight MTU diesel engines, providing 19,040hp. Little else is known about the superyacht, on which construction first began in 2018.

• Builder: Lloyd Werft
• Length Overall: 139.7 m
• Gross Tonnage 11247 t

18. Al Salamah | 139.3m

Built by the consortium of Howaldtswerke Deutsche Werft (HDW) in Kiel and the Lürssen shipyard in Germany, Al Salamah is often referred to as "Mipos", the code name used during the construction of this most secret of yachts. Mipos was short for "Mission Possible" – a statement proved correct by her delivery in 1999.

She has a length of 139.3 metres, a massive beam of 23.5 metres, and is reported to have a top speed of 21.5 knots. Both the interior design and the exterior styling are by the London-based Terence Disdale Design . Al Salamah was owned by the late Sultan bin Abdulaziz of Saudi Arabia, who also owned 147 metre Prince Abdulaziz . She was refitted by Lürssen in 2007 and is rumoured to carry a hospital room with an underwater treadmill for physical therapy on board.

• Delivery year: 1999
• Length Overall: 139.29 m
• Gross Tonnage 12234 t

19. Luminance | 138.8m

Espen Øino is repsonsible for this giant yacht's crisp exterior lines. Despite a traditional raked bow, she looks bang up to date with a gleaming hull and superstructure that counterpoise dark blue and silver to create a masculine look. Øino has played with the profile of the overhangs to give the illusion of reverse sheer amidships. The effect is especially striking when viewing the yacht from beam-on. Her twin helicopter pads – one on the foredeck and another high up aft – will make her capable of ambitious explorer programmes. She also boasts a large beach club and an infinity pool, with a private spa pool area on the foredeck of what may be an owner's deck.

Luminance was expected in 2023, but delivery has fallen back a fraction. It is a mammoth project, whose true length has only just been confirmed at 138.8 metres. Her Ukranian owner, mining and financial services mogul Rinat Akhmetov, told The New York Times last year that he was mulling the boat's sale following Russia's invasion of his homeland, but it's not known whether he followed through.

• Delivery year: 2024
• Length Overall: 138.8 m
• Gross Tonnage 8999 t

20. Rising Sun | 138m

Rising Sun was built for Larry Ellison, co-founder and CEO of Oracle. She's the last yacht that ever came from designer Jon Bannenberg’s drawing board, with interiors styled by   Laura Seccombe . Rising Sun ’s naval architecture experimented with an extensive use of structural glass for a clean and stripped-down profile.

In 2006, Ellison sold half ownership to media mogul David Geffen, who bought the remaining half in 2010. Rising Sun is reported to have cost more than $290,000,000 and was extended by 18 metres in-build to ensure she was larger than the 126.2-metre Octopus , belonging to Microsoft’s co-founder, Paul Allen. Her 8,000 square metres of living space can accommodate 45 crew members, and includes a wine cellar and basketball court, plus accommodation for 16. One of her tenders, a catamaran, carries the yacht’s 4x4 vehicle ashore.

• Delivery year: 2004
• Length Overall: 138 m
• Gross Tonnage 7841 t

21. Flying Fox | 136m

Formerly Project Shu, PYC-compliant Flying Fox was built by Lürssen for a serial charter yacht owner and completed her sea trials off the coast of Germany in May 2019. The 136-metre, six-deck yacht towers 32 metres above the waterline – as tall as three London buses balanced end on end. Her elegant, well-balanced profile by Espen Øino conceals an extraordinarily voluminous interior by Mark Berryman , including a double-height atrium that forms the main deck lobby. There are 11 cabins for 36 guests, all with private sea-view terraces, and expansive outdoor living spaces, such as a 12-metre swimming pool transversing the main deck aft, swim platforms and two helipads. The 400-square-metre spa is the stand-out feature. It has heated limestone floors, a Hammam, massage and beauty treatment rooms and the first cryosauna ever installed on a yacht, with a main chamber that reaches a chilly -110C. There’s also an on-board hospital.

One of the most expensive superyachts in the world available for charter , Flying Fox is crewed by an experienced team of 54. She boasts a toybox stuffed with jet skis and other Seabobs, hoverboards, room for a submarine and and nine different tenders. Plus, she even has her own dive centre and kite surf store on board.

• Delivery year: 2019
• Length Overall: 136 m
• Beam: 20.5 m
• Gross Tonnage 9100 t

Yachts for charter

22. savarona | 135.9m.

Built by Blohm + Voss for American bridge cable heiress Emily Roebling Cadwalader in 1931, Savarona was sold in 1938 to the Turkish government and became the presidential yacht of Kemal Atatürk. In 1989, Kahraman Sadikoglu obtained a 50-year lease and, with investors, spent $35,000,000 on the refit of this classic superyacht, including a library suite dedicated to the memory of Atatürk and furnished with his personal artefacts. In 2010, after an alleged scandal, the Turkish government cancelled the lease and resumed ownership. In 2014, she was refurbished and now serves as the state yacht of Turkey. 

Savarona was, for a time, offered on the market for superyacht charters around Istanbul, although she is no longer available to the public. Key features onboard this superyacht include a marble-finished Turkish hammam bath that spans the entire 16-metre beam, a swimming pool, a gold-trimmed grand staircase and a private cinema. She is named after a type of black swan found in the Indian Ocean region.

• Delivery year: 1931
• Length Overall: 135.94 m
• Beam: 16.12 m
• Gross Tonnage 4701 t

23. Crescent | 135.5m

Crescent , formerly Project Thunder, has what the yard called a "traditionally-styled" interior by Zuretti , exterior design by Espen Øino and naval architecture by Lürssen . Øino went to great lengths to maximise what he calls the "vision lines" from the interior and the decks – especially from the centreline, which on such a beamy boat is a long way from the sides – by having full height windows and keeping the bulwarks as low as possible.

She has a steel hull and aluminium superstructure and was built to DNV GL standards. Her striking black hull is matched with a silver superstructure that has distinctive wing stations amidships. Just forward of the wing stations are three-deck windows, providing spectacular views for her 18-strong guest list.

• Delivery year: 2018
• Length Overall: 135.5 m
• Gross Tonnage 9194 t

24. Serene | 133.9m

Built for a Russian owner, Serene was the first superyacht delivered by Italian yard Fincantieri . She can accommodate up to 24 guests and 52 crew, and boasts 4,500 square metres of interior space designed by Reymond Langton .

Serene has seven decks, two helipads and a hangar, carries a custom submarine certified to 100m depth and has underwater viewing ports in her Nemo room. A "snow room" can make up to four inches of snow, while the impressive spiral staircase rises through six decks and is lit by a large skylight. Serene won Best Motor Yacht of 3,000GT and Above at the 2012 World Superyacht Awards. Powered by a diesel engine, Serene can reach a top speed of 20 knots and has a maximum cruising range of 6000 nautical miles.

• Delivery year: 2011
• Length Overall: 133.9 m
• Beam: 18.6 m
• Gross Tonnage 8231 t

25. Al Mirqab | 133m

Al Mirqab was built by Peterswerft - Kusch for Hamad bin Jassim bin Jaber Al Thani – the former prime minister of Qatar. Her exterior design is by Tim Heywood and her interiors were styled by Winch Design . She is propelled by five generators that power two electric motors driving conventional shafts and a centrally positioned azimuthing electric pod drive. A grand staircase floats through four floors and surrounds suspended glass artwork by Dale Chihuly. 

Al Mirqab won Motor Yacht of the Year at the World Superyacht Awards 2009 and Best Interior Design among motor yachts. She can accommodate 60 guests and is manned by an equal number of crew.

• Builder: Peterswerft - Kusch
• Length Overall: 133.2 m
• Gross Tonnage 5000 t

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Boat Gross Tonnage Calculator

The Boat Gross Tonnage (BGT) Calculator is a vital tool used in maritime industries and ship registration processes to determine the gross tonnage of a vessel. This article delves into the importance of gross tonnage calculations, how to use the calculator effectively, and addresses common queries to provide insights into ship tonnage measurements.

Importance of Boat Gross Tonnage Calculation

Gross tonnage is a key parameter used in ship classification, port regulations, and maritime taxation. Understanding a vessel’s gross tonnage is crucial for various reasons:

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• Safety Regulations: Tonnage plays a role in safety equipment requirements and crewing regulations.

How to Use the Boat Gross Tonnage Calculator

Using the Boat Gross Tonnage Calculator is straightforward:

• Enter Boat Length: Input the overall length of the boat or ship in feet or meters.
• Enter Boat Breadth: Input the maximum breadth (width) of the vessel in feet or meters.
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• Calculate Gross Tonnage: Click the “Calculate Gross Tonnage” button to obtain the calculated gross tonnage based on the provided dimensions.

10 FAQs and Answers About the Boat Gross Tonnage Calculator

• What is gross tonnage (GT) in maritime terms? Gross tonnage is a measure of a ship’s internal volume, including all enclosed spaces, used for regulatory and administrative purposes.
• Why is gross tonnage important for ship registration? Gross tonnage classification determines a vessel’s legal status, compliance requirements, and port access.
• Can the Boat Gross Tonnage Calculator handle different measurement units? Yes, the calculator can handle various units for length, breadth, and depth conversions.
• Is gross tonnage different from net tonnage (NT)? Yes, net tonnage excludes certain spaces like crew quarters and machinery spaces, providing a measure of cargo-carrying capacity.
• What are the implications of a vessel’s gross tonnage for safety regulations? Tonnage influences safety equipment requirements, crewing levels, and emergency response protocols onboard ships.
• Can the calculator be used for different types of vessels, including boats and ships? Yes, the calculator is suitable for calculating gross tonnage for various watercraft, provided the input dimensions are accurate.
• How often should a vessel’s gross tonnage be recalculated? Gross tonnage typically remains constant unless significant modifications are made to the vessel’s structure or internal arrangements.
• Are there standard formulas or regulations governing gross tonnage calculations? Yes, international conventions and maritime authorities provide guidelines and formulas for calculating gross tonnage based on vessel dimensions.
• Does gross tonnage affect a vessel’s seaworthiness or performance? While tonnage is not directly related to seaworthiness, it influences a vessel’s regulatory compliance and operational parameters.
• Are there exemptions or special considerations for vessels based on gross tonnage? Certain vessels, such as pleasure craft or small boats, may be exempt from certain tonnage-related regulations based on their size and use.

The Boat Gross Tonnage Calculator is an essential tool for shipowners, maritime professionals, and regulatory authorities involved in vessel registration and compliance. By understanding the importance of gross tonnage, utilizing the calculator effectively, and staying informed about tonnage-related regulations, stakeholders can navigate the maritime industry with confidence and compliance. Incorporate gross tonnage calculations into your maritime operations for accurate vessel classification and regulatory adherence.

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What Size Yacht Requires a Captain’s License? Find Out Here

Have you ever dreamed of captaining your own yacht? Whether you’re a professional skipper or an amateur enthusiast, owning a yacht requires a unique set of skills and qualifications.

In this article, we’ll discuss what size yacht requires a captain’s license, the process for obtaining one, the benefits, and the penalties for operating a yacht without a license.

Read on to learn everything you need to know about captain’s licenses.

Table of Contents

Short Answer

In the United States, a captain’s license is required to operate any vessel of more than 25 gross tons, or any vessel that carries passengers for hire.

This includes larger yachts, as well as commercial vessels.

Depending on the size and the intended use, a captain may need to obtain a Master’s license or a higher level of certification.

Additionally, some states may require captains to have a specific license for vessels operating in their waters.

What is a Captain’s License?

A captain’s license is a qualification required in the United States for individuals wishing to operate a yacht larger than 25 gross tons.

This license is granted by the U.

Coast Guard and allows the holder to be in compliance with all federal laws and regulations governing the operation of large vessels.

This license is also necessary for commercial purposes, such as chartering a yacht for business purposes.

To obtain a captain’s license, the applicant must pass a series of tests administered by the U.

Coast Guard.

These tests include a physical examination, a written exam, and a practical exam.

Those who pass these tests are awarded a captain’s license and are legally authorized to safely and legally operate a yacht of any size.

The captain’s license is an important qualification for yacht owners, as it ensures that they are operating their vessels in compliance with all laws and regulations.

It also serves as a demonstration of the holder’s expertise in the field of boating and maritime operations.

It is important to note that the captain’s license is a prerequisite for many commercial activities involving the operation of a yacht, such as chartering and other business activities.

A captain’s license is an important qualification for any yacht owner, as it ensures that they are in compliance with all laws and regulations.

Those who wish to obtain a captain’s license should understand the steps necessary to do so, as well as the importance of the license for operating a yacht.

What is the Minimum Size of a Yacht Requiring a Captain’s License?

When it comes to the operation of a yacht, safety should always be paramount.

In the United States, if you wish to operate a yacht larger than 25 gross tons, you will be required to have a valid captain’s license from the U.

This license is necessary to be in compliance with the federal laws and regulations governing the operation of large vessels.

The license is also required if the yacht is to be utilized for commercial purposes.

So, what size yacht requires a captain’s license? Generally speaking, if the yacht is larger than 25 gross tons, then a captain’s license is required.

The exact size of the vessel will depend on several factors, such as the type of vessel, its gross tonnage, and its intended use.

Coast Guard has a detailed set of regulations that outlines the requirements for licensing, and it is recommended that prospective captains familiarize themselves with these regulations before attempting to operate a yacht.

Additionally, the size of the yacht’s crew can also be taken into consideration.

Generally speaking, if the vessel requires more than four crew members, then a captain’s license may be necessary.

Additionally, some states may have different requirements for licensing, so it is important to familiarize yourself with the laws and regulations for the state in which you will be operating the vessel.

A captain’s license is necessary to safely and legally operate a yacht of any size.

It is important to note that the captain’s license is not the same as a recreational boating license, and it is important to understand the difference between the two.

In conclusion, the minimum size of a yacht requiring a captain’s license is 25 gross tons.

It is important to familiarize yourself with the laws and regulations pertaining to the operation of large vessels and to obtain the necessary licensing before attempting to operate a yacht.

What is the Process for Obtaining a Captain’s License?

Obtaining a captain’s license is not a simple process.

It requires dedication, preparation and commitment.

In the United States, the U.

Coast Guard is responsible for issuing captain’s licenses.

To become licensed, an applicant must first pass a series of tests administered by the U.

This includes a physical examination, a written exam and a practical exam.

The physical examination is conducted to ensure that the applicant is healthy enough to operate a vessel.

This exam includes measuring the applicant’s vision, hearing, and physical strength.

The written exam tests the applicant’s knowledge of nautical rules, regulations, and practices.

This exam is designed to ensure the applicant has a comprehensive understanding of the procedures and laws related to operating a yacht.

The practical exam is designed to test the applicant’s ability to safely and effectively operate a vessel.

This exam is conducted on the water, and the applicant must demonstrate their ability to maneuver the vessel in a variety of conditions.

In addition to passing these tests, the applicant must also possess a valid state-issued driver’s license, and must be at least 18 years of age.

The applicant must also provide proof of U.

citizenship, or a valid alien resident card.

The process of obtaining a captain’s license can be long and challenging.

However, those who successfully obtain a license will be able to legally and safely operate any yacht larger than 25 gross tons.

What Are the Requirements for Obtaining a Captain’s License?

Obtaining a captain’s license is an important and mandatory step for anyone who wishes to operate a yacht larger than 25 gross tons in the United States.

This license is necessary in order to be in compliance with federal laws and regulations governing the operation of large vessels, as well as if the yacht is to be used for commercial purposes.

The process of obtaining a captain’s license requires applicants to pass a series of tests administered by the U.

Coast Guard, including a physical examination, a written exam, and a practical exam.

The physical examination is to ensure that the applicant is physically fit to be the captain of a large vessel.

This will involve a vision and hearing test, as well as a general physical exam to make sure the applicant is healthy enough to handle the duties of a captain.

The written exam is a series of multiple-choice questions that cover topics such as navigation, marine safety, and boating laws.

This exam is designed to test the applicant’s knowledge of the applicable laws, regulations, and procedures for operating a large vessel.

The practical exam is a hands-on examination of the applicant’s ability to safely and securely operate a vessel.

This will involve tasks such as docking and anchoring, emergency procedures, and navigational skills.

This exam is designed to ensure that the applicant is capable of safely navigating a yacht in any environment.

It is important to note that once a captain’s license is obtained, it is valid for five years.

After five years, the license must be renewed in order to remain valid.

Renewing a captain’s license requires the applicant to complete a recertification course, as well as pass an oral exam.

By obtaining a captain’s license, the applicant is demonstrating their commitment to safety, as well as their knowledge of the applicable laws and regulations governing the operation of large vessels.

This license is necessary to safely and legally operate a yacht of any size, and is a vital part of the process of becoming a responsible and capable captain.

What Are the Benefits of Having a Captain’s License?

When it comes to operating a yacht, having a valid captain’s license is essential.

Not only is it a requirement by the U.

Coast Guard, but it also provides a number of benefits to the captain and passengers.

By obtaining a captain’s license, the vessel operator will have the knowledge and skills necessary to safely and legally operate a vessel of any size.

Having a captain’s license demonstrates to other boat operators and passengers that the captain is knowledgeable and capable of safely navigating and operating the boat.

This can help to build trust and confidence among all those on board, and make for a more enjoyable experience.

The captain’s license also provides a sense of responsibility to the captain and passengers, as the license holder is held to a higher standard when it comes to safety and navigation.

A captain’s license can also be beneficial for those wishing to pursue commercial opportunities with their yacht.

Having a valid license can increase the chances of qualifying for charter boat services, as most companies require captains to have a valid license.

Additionally, having a captain’s license may make it easier to obtain insurance and other services, such as financing, for the yacht.

Finally, having a captain’s license can provide a sense of accomplishment to the individual who has earned it.

Captains who have earned their license have demonstrated their knowledge and skill in operating a vessel, which is something that should be celebrated.

In summary, having a captain’s license can provide a number of benefits to the captain and passengers of a yacht.

Coast Guard, but it also provides a sense of trust and responsibility, as well as commercial opportunities and a sense of accomplishment.

What Are the Penalties for Operating a Yacht Without a Captain’s License?

Operating a yacht without a valid captain’s license is a serious offense, and it can result in significant penalties.

Depending on the size of the yacht, the operator may be subject to civil and criminal penalties, including fines, imprisonment, and suspension or revocation of the vessel’s registration.

The penalties for operating a yacht without a captain’s license can vary greatly depending on the size and purpose of the vessel.

For example, operating a large, commercial vessel without a captain’s license can result in fines of up to $50,000, and the vessel may be confiscated and the operator may face up to 10 years in prison.

Operating a recreational vessel without a captain’s license can result in fines of up to $5,000 and the vessel may be seized and the operator may face up to six months in prison.

In addition to the legal penalties, operating a yacht without a captain’s license can also put people’s lives and property at risk.

A captain’s license demonstrates a working knowledge of the federal laws and regulations governing the operation of large vessels, and it also ensures that the operator is familiar with the safe and proper operation of their vessel.

Operating a yacht without a captain’s license is a serious offense and can result in significant penalties.

It is important to remember that a captain’s license is necessary to safely and legally operate a yacht of any size in the United States.

If you wish to operate a yacht larger than 25 gross tons, make sure to obtain a valid captain’s license from the U.

What Are the Different Types of Captain’s Licenses?

When it comes to operating a yacht larger than 25 gross tons, having a valid captain’s license is absolutely essential.

The United States Coast Guard (USCG) issues several different types of captain’s licenses depending on the size of the vessel and its intended purpose.

The most basic license is the Operator of Uninspected Passenger Vessel (OUPV) license, which allows a captain to operate a vessel of up to 6 passengers for hire within a certain geographic area.

This license is commonly referred to as a “six-pack license.

” Next up is the Master of Near Coastal Waters license, which allows a captain to operate a vessel of up to 100 gross tons within a certain geographic area.

This license is commonly referred to as a “100-ton license.

” If a captain wishes to operate a vessel larger than 100 gross tons, then he or she will need to obtain a Master of Oceans license.

This allows a captain to operate any size vessel, anywhere in the world.

Finally, there is the Master of Assistance Towing license, which allows a captain to operate a vessel of any size for towing purposes.

This license is commonly referred to as a “towing license.

” No matter which type of captain’s license you need, it is important to note that all of them require the applicant to pass a series of tests administered by the USCG, including a physical examination, a written exam, and a practical exam.

By obtaining any of the above captain’s licenses, you will be in compliance with the federal laws and regulations governing the operation of large vessels, as well as be able to safely and legally operate a yacht of any size.

Final Thoughts

It is important to understand the requirements for obtaining a captains license if you plan on operating a yacht over 25 gross tons.

Not only will it make your voyage safer and more enjoyable, but it is also a requirement for commercial operations.

With the right knowledge and preparation, obtaining a captains license can be an achievable goal.

To learn more about the process, requirements, and benefits of having a captains license, be sure to visit the U.

Coast Guard website.

James Frami

At the age of 15, he and four other friends from his neighborhood constructed their first boat. He has been sailing for almost 30 years and has a wealth of knowledge that he wants to share with others.

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Is GT just a gross misconception?

The lingering fascination with gross tonnage affects how superyachts are valued…but is there a better metric.

The metrics by which we measure superyachts carry value connotations. But value to who? Misconceptions around the true definition of gross tonnage persist across many areas of the industry. Gross tonnage, the second figure quoted in most references to a yacht after LOA (length overall), is a measurement that traces its origin to the merchant fleet using the moulded volume of enclosed spaces of the ship. It may be, however, be an outdated measurement when simplistically attributing value to the user of a yacht.

Originally these findings were published in the Superyacht New Build Report, using Data Supplied by The Superyacht Agency and Rob Doyle Design. The latter whose reimaging of the concept of 'usable space' onboard the convention-busting concept "Project Fury'  led to this piece. 

The relationship of GT to the amount of lived-in space is weak. Even the most extravagant real estate does not include a volumetric measurement. Square metres give the floor space, and the three-dimensional space is inferred. Obviously, it has many applications across the commercial sector and for purposes of classification, but its persistence in the superyacht sector leads to misunderstandings.

As a mathematical curiosity, it’s intriguing. Volume increases as the length, width and height of a shape increase (by the power of three). Increase the length of the sides of a cube from one metre to three metres and the volume will grow to 27m3, for example. Large yachts’ cubic spaces (GT) increase disproportionately with length.

The growth of this curve is not as drastic X to the power of 3, as would be expected from perfect cubes, but it does still convey the disproportionate increase in GT vs LOA. Converting this to a meaningful statistic is challenging and should not be taken at face value.

Figure 3, below, shows a selection of well-known sailing yachts and motoryachts plotting GT vs LOA, and while not directly comparable, the less pronounced trend is clear. Sailing yachts do not exhibit a very noticeable increase in volume vs length because, in general, they don’t grow in height vs length in the same way that a motoryacht does. Nothing revelatory there.

The intriguing difference comes when a different metric is applied. By carefully analysing the GAs of a selection of sailing yachts, in partnership with Van Geest Design, and selecting the ‘usable’ spaces, a different distribution can be seen, as shown in Figure 4, below.

Usable space has been calculated here manually but it is broadly the guest usable spaces, no technical walkways, no winch spaces, tender garages or limo bays etc. These spaces are then divided by the cubed route of the floor plan vs GT to remove the volumetric consideration. This is then plotted against the square root of the length vs the length on deck, not the length overall, again to consider the usable spaces. This re-evaluation produces a far less reductive distribution.

S/Y Vertigo, a 67m vessel with 837GT and one of the larger sailing yachts, sits above the trend line in Figure 3, suggesting a high return of internal spaces. However, when taking into account just the interior spaces that can be used by removing outlying space, it falls below the trend line in Figure 4. Conversely, S/Y M5 moves from average to well above the trend line.

This is a concept that requires input, not least from designers and yards, but it allows for more specific consideration of a yacht’s usable space. The majority of this data is available but requires manual manipulation and CAD analysis of GAs. It does, however, offer an alternative and unique re-evaluation of value to the client.

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USCG Tonnage Calculator Online

The US Coast Guard (USCG) Tonnage Calculator is a critical tool for maritime professionals, vessel owners, and regulatory bodies. It calculates the gross tonnage (GRT) of a vessel, a measure of its overall size and capacity. This calculation is not only a regulatory requirement but also plays a pivotal role in determining port fees, safety regulations, and crewing requirements. Understanding the gross tonnage of a vessel ensures compliance with maritime laws and aids in the efficient management of maritime operations.

Formula of USCG Tonnage Calculator

To calculate the gross tonnage of a vessel, one must understand and apply specific formulas based on the type and configuration of the vessel. Here are the formulas:

Gross Tonnage (GRT):

A. single hull vessels:.

• Power-driven : GRT = (L x B x D x 0.67) / 100
• Sailing/Auxiliary : GRT = (L x B x D x 0.50) / 100

b. Twin Hull Vessels:

• GRT = [(2 x Hull Volume) + (Deckhouse Volume)] / 100
• L : Length of the vessel (feet)
• B : Breadth of the vessel (feet)
• D : Depth of the vessel (feet)
• 0.67 : Coefficient for power-driven vessels
• 0.50 : Coefficient for sailing/auxiliary vessels

Table for General Terms

The following table provides a quick reference for common terms related to the USCG Tonnage Calculator. This guide helps users understand essential metrics without the need for detailed calculations:

Example of USCG Tonnage Calculator

Consider a power-driven single hull vessel with the following dimensions: Length = 200 feet, Breadth = 50 feet, and Depth = 25 feet. Using the formula for power-driven single hull vessels:

GRT = (200 x 50 x 25 x 0.67) / 100 = 16,750 / 100 = 167.5

Therefore, the gross tonnage of this vessel is 167.5.

Most Common FAQs

Calculating gross tonnage is essential for compliance with maritime laws, determining vessel fees, and ensuring safety regulations are met based on vessel size.

The USCG Tonnage Calculator focuses on gross tonnage. Net tonnage requires additional calculations considering cargo space and other factors.

Yes, the calculator provides formulas for both single hull and twin hull vessels, covering a wide range of vessel types.

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The 5 largest yachts by gross tonnage at the Monaco Yacht Show 2018

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By Rebecca Bradbury   14 September 2018

The 2018 Monaco Yacht Show is fast-approaching, and as 120 one-off superyachts prepare to go on display, YachtCharterFleet reveals the five largest on the line-up according to gross tonnage.

In an article written last week, we rounded up the 5 largest yachts attending the Monaco Yacht Show by length . But, below we list - in ascending order - the yachts with the biggest gross tonnage - a measurement that refers to a yachts’ overall internal volume.

#5 Areti – 2,817 GT

The 85m/279ft superyacht ARETI , a Lurssen build, was fifth on the list for the longest yachts signed up for the upcoming show and stays in the same place when comparing the interior volume.

She returns to the event after making her worldwide debut at the 2017 edition and is expected to once again capture much attention for both her vast expanse and world-class amenities. Among these are gym and spa facilities designed for elite athletes and space for 20-plus guests.

The interior styling from Andrew Winch Design is also notable for its fresh American-classic theme. This has been created by combining makore joinery, Emperador and Borricno marble floors and brass accents. 

#4 Aquarius - 2,980 GT

After making her debut at last year's edition of the Monaco Yacht Show, the 92m/302ft  motor yacht AQUARIUS is reappearing and takes fourth spot on the leaderboard for her gross tonnage.

The luxury yacht was designed by Feadship, and features immaculate interiors with accommodation for up to 14 guests. She is one of the most recent yachts to confirm her attendance at the event.

Though sadly not available for private yacht charter, the yacht will be on display for show-goers to admire her sleek and contemporary finish. High windows allow light to flood in and bathe her interior spaces, giving the superyacht an elegant and sophisticated edge.

#3 Barbara – 2,984 GT

Oceanco ’s 88m/290ft charter yacht BARBARA comes in as the fourth largest yacht by length but, at 2,984 GT, the third largest yacht by volume. With her dark hull and shapely superstructure, the 2017 launch will certainly not be hard to spot lined up in Monaco’s Port Hercules.

Show attendees lucky enough to climb aboard will also find it impossible not to note her unusual layout. Most noteworthy is the owner’s office which, located in the central area of the yacht, has drop-down balconies either side to create a huge expanse filled with fresh air and natural light.

The self-contained master suite, meanwhile, is located forward on the owner’s deck and other distinctive features include an aquarium by Living Color in the main salon, a lower deck cinema with Lay-Z Boy chairs and a striking timber and metal vine sculpture that wraps its way around the lift shaft.

#2 Dar – 2,999 GT

Not only will the 90m/295ft superyacht DAR – also from Oceanco - be the second largest yacht by volume to appear at MYS 2018, but she will be the second largest yacht by length at the event.

Launched in July, she is one of the most exciting superyachts to hit the water this year due to her ground-breaking design and technological innovations. Making her worldwide debut at the show, she is expected to attract much attention and acclaim.

One of her radical features is the glass-clad exterior and this has been designed in harmony with the interior. Based on the theme of nature, the inside guest living areas are said to be decorated in fine fabrics, wall paper, 3D lacquer and woods such as Brazilian Carballo and bleached grey maple.

#1 Illusion Plus – 3,642 GT

Ranking in first place with a huge volume of 3,642 GT is the 89m/291ft motor yacht ‘Illusion Plus’ from Chinese shipyard Pride Mega Yachts. This figure is an impressive 643 GT ahead of her nearest rival (DAR) and may be surprising given that, at 89 metres, she is only the third longest yacht on the line-up.

Similarly to DAR, she was launched this summer and will be premiering at the yachting event after undertaking her maiden voyage from China to Monaco . She is expected to receive a warm welcome from industry professionals keen to discover her unparalleled sense of space and luxury interior.

A dedicated spa, beauty salon and gymnasium, and an 80-square-metre master suite are just a few of her highlights for guests to enjoy, while a diesel-electric propulsion package by Rolls Royce ensures the ultimate in cruising performance and energy efficiency.

For further details on any charter yacht at MYS 2018, speak to your preferred charter broker .

Alternatively, view all superyachts attending the Monaco Yacht Show 2018 .

A selection of charter yachts at the Monaco Yacht Show 2018:

63m Holland Jachtbouw 2010 / 2023

55m Heesen 2011 / 2022

46m Palmer Johnson 2010 / 2022

95m Lurssen 2014

89m Oceanco 2017

51m Heesen 2018

72m Tankoa Yachts 2018 / 2023

38m Custom Line 2018

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How Big Are Yachts? 5 Types Explained (With Numbers)

Yachts can come in a variety of sizes and weights. Before you purchase a yacht, you must know what size yacht you need.

The size and weight of the yacht that you need will depend greatly on what your intended use is for the yacht that you are purchasing.

Table of Contents

Here’s everything you need to know about the weight of yachts:

Here’s an Idea of How Big Yachts Are:

The term “Yachts” refers to a pleasure vessel that is at least 30 feet in length and has some type of cabin with some amenities. The biggest luxury yacht is 590 feet (180 meters) and 13,136 gross tons.

What Do We Mean When We Talk About Weight?

There are two types of weight for a boat, dry weight, and wet weight.

Dry weight is the weight of the boat without any fluids in the tanks. Wet weight is the weight of the boat with the fluids in the tanks.

You can also have a loaded weight, which is the wet weight, including any additional toys or equipment you have stored onboard.

What Do We Mean When We Talk About Length?

There are many different ways to calculate a boat’s length. For this reason, you want to make sure that you have a clear idea of what the length of your boat really is.

The boat’s registered length is generally the maximum overall length, which is the length on deck plus any bowsprit or swim deck.  The length of the boat on the waterline is also an important boat characteristic that you should know.

Due to the shape and construction of the hull, these numbers may differ.

For example, if you have a boat that has a 50-foot deck with no bowsprit, your registered length will be 50 feet.

Some boats are measured using “LOA,” otherwise known as length overall.

Why Is Knowing The Weight And Length Important?

The most important reason to know your boat’s weight and length is for when you choose to shop for trailers or even to determine if your vehicle can haul it.

If you try to tow a boat without an accurate representation of the weight or length, you can ruin your vehicle’s engine and even your towing equipment, not to mention have serious safety issues.

Another reason to know about your vessel’s weight is to know how much you can bring for your trip without packing more than the maximum weight allowed.

It is also important to know your weight and how it can affect your boat, especially when it comes to speed.

Different Types of Boats and Their Average Weight and Length

Below are some different types of boats and their average size and weight, and the factors that go into them.

1. Luxury Yacht

Yachts are normally classified as any watercraft that can be used for pleasure or sport and can range from 30 ft to over 100 ft.

While a yacht can be as small as 30 ft. long, a yacht is often considered a cabin cruiser until it is 39 ft. or more, then it is considered a proper yacht.

A yacht would be considered a large yacht once it’s length is over 79 feet. A yacht is considered a superyacht or megayacht if it is over 115 feet long.

The yacht the holds the record for being the longest yacht is 590 feet long. This yacht is called the “Azzam” and has held onto its title for over 5 years.

Because of the wide variety of sizes, the weight can vary greatly when it comes to yachts, and it is hard to nail down an average.

Some more distinctive differences between yachts include:

• These yachts are single-deck yachts with one living quarter below . They are often sleek and sporty.
• Also known as a sedan bridge or sport bridge yacht. This yacht has an area on top of the superstructure that features a view all the way around the vessel.
• This deck up top can offer a control station or even lounge seating, depending on its size.
• Also known as a pilothouse motor yacht, cockpit motor yacht, or sky lounge. This term can be used for any large recreational vessel that is motor powered.
• Usually, this means a multi-deck vessel similar to a flybridge but instead has a large interior deck.
• Often classified as a mega yacht, which is normally any vessel 80 ft. or more. This vessel is exactly what it sounds like.
• It is a yacht with three levels of enclosed living space.
• A sportfishing yacht is any yacht that is geared towards fishing.
• They often have areas designated to storage for rods, bait, tackle, and even areas to store the day’s catch.

2. Sailboats

Large sailboats are yachts propelled by sails and can be found in lakes, rivers, and even out on the ocean.  Today, they almost all have auxiliary power in the form of an engine.

While the weight and length of a sailboat can drastically vary, the average weight of a sailboat is about 8,800 pounds. This weight does not include added gear, equipment, or fluids.

The weight will vary greatly depending on the length of the sailboat. Sailboat lengths can range between 8 feet to 472 feet.

The 472-foot sailboat also carries three masts that tower at over 91 feet each. This can definitely add more weight than the 8-foot vessel.

Listed below are 6 examples of sailboats and their weights and lengths:

• Catalina 16 LOA: 16 ft. 4 in. Hull Weight: 430 pounds
• Hunter 22 LOA: 21 ft. 4 in. Hull Weight: 3,200 pounds
• C&C 27 LOA: 27 ft. 4 in. Hull Weight: 5,180 pounds
• Erickson 28.5 LOA: 28 ft. 7 in. Hull Weight: 8,500 pounds
• Pearson 39 LOA: 39 ft. 3 in. Hull Weight: 17,000 pounds
• Swan 48 LOA: 47 ft. 11 in. Hull Weight: 36,000 pounds

3. Speed Boats (Cigarette Boats)

Speed boats are sleek and built for achieving high levels of speed.

These boats are not made for watersports and should not be confused with ski boats.

A speed boat’s average weight is slightly less than that of a sailboat at roughly 8,000 pounds.

Some of the factors that determine a speed boat’s weight can include their length, engines, and sleekness.

Listed below are some examples of speedboats and their weights and lengths:

• Cigarette 38 Top Gun LOA: 37 ft. 8 in. Hull Weight: 9,175 pounds
• 32 Thunder Cat LOA: 32 ft. Hull Weight: 5,400 pounds
• M35 LOA: 35 ft. 4 in. Hull Weight: 9,250 pounds

4. Deck Boats or Pontoon Boats

Deck boats and pontoon boats both have large decks and are mostly intended for recreational use.

Pontoon boats have the lowest average weight at 3,100 pounds .

Because they do not have large hulls, they can be lighter and cut across the water easier than boats with larger hulls.

Listed below are some examples of deck boats and their weights and lengths:

• NauticStar 211 Angler (Deckboat) LOA: 20 ft. 9 in. Weight: 2,100 pounds
• Stingray 212SC (Deckboat) LOA: 21 ft. 11 in. Weight: 3,100 pounds
• Hurricane SunDeck 2690 LOA: 26 ft. 4 in. Weight: 4,475 pounds

5. Cabin Cruisers

Cabin cruisers are large boats that are sometimes looked at as mini-yachts.

These boats allow for sleeping accommodations and other luxuries afforded in their cabin space.

Like the sailboat, a cabin cruiser’s weight can vary. However, they do tend to have a smaller range than sailboats.

The average weight of a cabin cruiser is about 8,700 pounds.

One of the major factors in the weight of cabin cruisers is the size of the sleeping accommodations below. Some models of cabin cruisers can even sleep up to 10 people.

Listed below are some examples of cabin cruisers and their weights and lengths:

• Larson 274 Cabrio LOA: 28 ft. Dry Weight: 6,001 pounds
• Rinker 301 Express Cruiser LOA: 32 ft. Dry Weight 7,640 pounds
• Bayliner 285 SB LOA: 28 ft. 9 in. Dry Weight: 8,056 pounds

Picking a Yacht:

Yachts can vary in a wide array of sizes, weights, styles, and even purposes.

You can race them, fish on them, and cruise around at an easy pace.

You can take a day trip or even take personal cruises that last days or weeks.

With ample deck and cabin space that offers activities, sunbathing, kitchens, lounges, and sleeping quarters, a yacht is often the most comfortable way to experience the open water.

To choose a yacht, you will want to know what type of yacht you are looking for and what you want to use it for.

You also want to make sure when picking a yacht; you make sure you keep the weight and length in mind to make sure you have a proper towing vehicle and trailer for your vessel.

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Catamaran Design Formulas

• Post author By Rick
• Post date June 29, 2010
• 10 Comments on Catamaran Design Formulas

Part 2: W ith permission from Terho Halme – Naval Architect

While Part 1 showcased design comments from Richard Woods , this second webpage on catamaran design is from a paper on “How to dimension a sailing catamaran”, written by the Finnish boat designer, Terho Halme. I found his paper easy to follow and all the Catamaran hull design equations were in one place.  Terho was kind enough to grant permission to reproduce his work here.

Below are basic equations and parameters of catamaran design, courtesy of Terho Halme. There are also a few references from ISO boat standards. The first step of catamaran design is to decide the length of the boat and her purpose. Then we’ll try to optimize other dimensions, to give her decent performance. All dimensions on this page are metric, linear dimensions are in meters (m), areas are in square meters (m2), displacement volumes in cubic meters (m3), masses (displacement, weight) are in kilograms (kg), forces in Newton’s (N), powers in kilowatts (kW) and speeds in knots. 

Please see our catamarans for sale by owner page if you are looking for great deals on affordable catamarans sold directly by their owners.

Length, Draft and Beam

There are two major dimensions of a boat hull: The length of the hull L H  and length of waterline L WL  . The following consist of arbitrary values to illustrate a calculated example. 

L H  = 12.20      L WL  = 12.00

After deciding how big a boat we want we next enter the length/beam ratio of each hull, L BR . Heavy boats have low value and light racers high value. L BR  below “8” leads to increased wave making and this should be avoided. Lower values increase loading capacity. Normal L BR  for a cruiser is somewhere between 9 and 12. L BR  has a definitive effect on boat displacement estimate.  

• Tags Buying Advice , Catamaran Designers

Owner of a Catalac 8M and Catamaransite webmaster.

10 replies on “Catamaran Design Formulas”

Im working though these formuals to help in the conversion of a cat from diesel to electric. Range, Speed, effect of extra weight on the boat….. Im having a bit of trouble with the B_TR. First off what is it? You don’t call it out as to what it is anywhere that i could find. Second its listed as B TR = B WL / T c but then directly after that you have T c = B WL / B TR. these two equasion are circular….

Yes, I noted the same thing. I guess that TR means resistance.

I am new here and very intetested to continue the discussion! I believe that TR had to be looked at as in Btr (small letter = underscore). B = beam, t= draft and r (I believe) = ratio! As in Lbr, here it is Btr = Beam to draft ratio! This goes along with the further elaboration on the subject! Let me know if I am wrong! Regards PETER

I posted the author’s contact info. You have to contact him as he’s not going to answer here. – Rick

Thank you these formulas as I am planning a catamaran hull/ house boat. The planned length will be about thirty six ft. In length. This will help me in this new venture.

You have to ask the author. His link was above. https://www.facebook.com/terho.halme

I understood everything, accept nothing makes sense from Cm=Am/Tc*Bwl. Almost all equations from here on after is basically the answer to the dividend being divided into itself, which gives a constant answer of “1”. What am I missing? I contacted the original author on Facebook, but due to Facebook regulations, he’s bound never to receive it.

Hi Brian, B WL is the maximum hull breadth at the waterline and Tc is the maximum draft.

The equation B TW = B WL/Tc can be rearranged by multiplying both sides of the equation by Tc:

B TW * Tc = Tc * B WL / Tc

On the right hand side the Tc on the top is divided by the Tc on the bottom so the equal 1 and can both be crossed out.

Then divide both sides by B TW:

Cross out that B TW when it is on the top and the bottom and you get the new equation:

Tc = B WL/ B TW

Thank you all for this very useful article

Parfait j aimerais participer à une formation en ligne (perfect I would like to participate in an online training)

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48-50ft Catamaran Models Comparisons

We compare the specifications, dimensions, sail area, and pricing on the most popular 48-50ft catamarans in 2020. The Lagoon 50 , Bali 4.8 , FP Saba 50, and Leopard 50 are within a similar price range and dimensions, but there are major differences. Let’s compare apples to apples to see how the match up.

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Calculation of GT (Gross Tonnage) Help Needed

Discussion in ' Boat Design ' started by landbound , Mar 24, 2011 .

landbound Junior Member

Can anyone assist with regard to the measurement of GT (Gross Tonnage) for a catamaran sailing boat of approximately 14 Meters I do understand that most boating countries have a simplified calculation applicable to pleasure boats and in the case of the USA for craft below 5GT. This is not the case for Indonesia where the measurement is required. I want to own and sail a catamaran in Indonesia. The Indonesian shipping Law 17 / 2008 is clear that only an Indonesian may own or sail a boat avove 7GT. Thus any boat I build or buy must be below 7GT. I am fully aware of the CAIT that permits foreign flagged vessels to cruise Indonesia, however I am not looking for avoidance strategies however useful they have been for others. Anyone with a knowledge of International Convention on Tonnage Measurement of Ships, 1969 will realize it is purposed for cargo ships and to a lesser extent for passenger ships not for pleasure craft - thus an enthusiastic amateur is unlikely to get any calculation right, - not because the calculations are difficult but becuase the defintions are really unsuitable for catamarans - the full horror of the measurement methodology can be viewed here - http://untreaty.un.org/unts/60001_120000/21/34/00041700.pdf I am delighted to pay a professional to perform the calculations and would supply cad drawings that would allow the determination of internal volumes. That person must be "a competent person or organization recognized under the provisions of the international treaty" my guess is if you don't know if you are then you are not ! For me to engage such a person I would want evidence that they are authorized to certify by their relevant national authority and that they have some experience calculating GT on pleasure craft using the full treaty method not for example the US Coast Guard "simplified" calculation. With the greatest respect to any marine surveyor reading this, years of experience with tankers and bulk ore carriers is unlikely to be helpful. What will help is practical experience with the relevant authorities and knowing for example what the authorities view of the definition of a "deck" or "stepped deck" is with respect to a sailing catamaran. Equally welcome would be a contact that you know might be versed in such arcana. If you have managed to get to the end of this incredibly dull email I thank you and ask you to shed a tear for those who wish to sail legally in Indonesia without resorting to classic third world "fixes". Guy Warwick  

RAraujo Senior Member - Naval Architect

The ITC 69 is not applicable to boats under 24m (although some adaptations have been made in some countries, like those of EU, to extend its application). Most probably Indonesia will have their own regulations for calculating the tonnage of pleasure boats/boats under 24m). Check with the authorities which regulations are applicable - most probably there will be a simplified calculation (even if measurement is required). Measurements are required probably because most of the local boats are tradicionally built without a set of plans from where you can obtain the measurements. You can try to contact also one of the classification societies' local offices.  

No Pleasure boat Regulations in Indonesia Many Thanks there are no pleasure boat regulations in Indonesia other than a tax code for their importation. A simplified calculation does not exist as stated in my first post. The 24 metre rule is an exception to the 69 convention it is not an exception to Indonesian Regulations where calculation as per the convention is necessary to meet the 7GT test. Very unreasonable but that is the law. I have already approached a local surveyor and as I expected they have never had to calculate GT for a pleasure craft. Do you know anyone in your jurisdiction who might have experience with such a calculation on a sailing catamaran Thanks  

So it seems they are following the same scheme as the EU countries... The tonnage is quite easy to calculate - you just need to have the whole enclosed volumes of the boat. If you have a lines drawing and a general arrangement I can do it for you (for free) and without any warranties that it will be accepted. Anyway I've asked an idonesian naval architect, who is a friend of mine, to clarify this and I will get back to you if there are any news. Rodrigo  

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rodrigo you are very Kind I have PMed you my email address rodrigo you are very Kind I have PMed you my email address  

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Boat Gross Tonnage Calculator

Unit converter ▲, unit converter ▼.

Calculating the gross tonnage of a boat is essential for understanding the vessel's size, capacity, and compliance with certain regulations. Gross tonnage is not just a measurement of weight; it's a volumetric measure that reflects the overall size of the boat, including all its enclosed spaces.

Historical Background

The concept of tonnage has evolved over centuries, originally used to estimate the cargo capacity of a ship. Today, gross tonnage is a universally accepted standard for measuring a ship's size, governed by international conventions such as the International Convention on Tonnage Measurement of Ships, 1969.

Calculation Formula

The formula for calculating Boat Gross Tonnage (BGT) is given by:

\[ BGT = \frac{0.5 \times BL \times BD \times BW}{100} \]

• \(BL\) is the boat length in feet,
• \(BD\) is the boat breadth in feet,
• \(BW\) is the boat depth in feet.

Example Calculation

To calculate the gross tonnage of a boat that is 30 feet long, 10 feet broad, and 5 feet deep:

\[ BGT = \frac{0.5 \times 30 \times 10 \times 5}{100} = 7.5 \text{ tonnage} \]

Importance and Usage Scenarios

Understanding a boat's gross tonnage is crucial for regulatory compliance, determining harbor fees, and assessing the vessel's capacity and safety. It's a key factor in maritime economics, safety regulations, and environmental considerations.

Common FAQs

What does "gross tonnage" actually measure?

• Gross tonnage measures a boat's overall internal volume, including all passenger and cargo spaces, machinery rooms, and crew quarters.

Why is gross tonnage important?

• It's used for regulatory classifications, safety standards, and calculating port fees. It also helps in comparing the size and capacity of different vessels.

How does gross tonnage differ from net tonnage?

• While gross tonnage measures the overall internal volume of a boat, net tonnage excludes spaces not used for cargo or passengers, providing a measure more directly related to the vessel's carrying capacity.

The Boat Gross Tonnage Calculator simplifies this complex calculation, making it accessible to boat owners, builders, and maritime professionals, ensuring accurate measurements for regulatory and operational purposes.

Calculating GRT for Mariner Credentials

I have a question about Gross Registered Tonnage for Mariner Licensing. A good portion of my sea time is on a private yacht that just shows Gross Tonnage on the COI, not Gross Registered Tonnage. Is there a formula used to determine Gross Registered Tonnage for a vessel for Mariner Credentials? Thanks in advance,

The USCG considers 1600 GRT equal to 3000 GT.

I’m not sure what they do about smaller vessels.

Here is what I have used for CG 719S Sea Service Form.

A simplified set of gross tonnage formulas is set forth by the U.S. Coast Guard Marine Safety Center, which are based on three measurements: Length (L), breadth (D), and depth (D). Under this system, the means of estimating gross tonnage is as follows:

For power boats: Gross Tonnage = (. 67 x L x B x D) / 100.

For a sailing boat with keel, Gross Tonnage = (.375 * L * B * D) / 100

For freighters with angled or cylindrical hulls, Gross Tonnage = (.67 * L * B * D) / 100

For ships with square barge-shaped hulls, Gross Tonnage = (.84 * L * B * D) / 100**

For a boat with a simple sailing hull, Gross Tonnage (GT) = (.5 x L x B x D) / 100**

Vessel Gross Tonnage Calculator

And 500 GT = 200 GRT. See also 46 CFR 11.211(h) .

Where does it state you can use these formulas to calculate Gross Registered Tonnage for the CG 719S?

You’re making this harder than it needs to be. If the vessel is only measured in GT you don’t need GRT See the link I posted above.

Thank you again. I like idea to simplify and not complicate the issue.

However, I have for years used 46 CFR 69.209 and the Simplified Measurement Tonnage Guide 1 for my calculations for the 719S form.

Many years ago, I was referred to the Gross Register Tonnage regulation of small vessel calculations if it was unknown.

Thanks for all of the great information. So if I am working an a vessel that’s only calculated with the simplified tonnage, how does this type of Vessel Gross Tonnage work when looking to upgrade your license when the Sea Service for the vessels needs to be in Gross Registered Tonnage? I attached a picture of the specs on the vessel along with a license checkoff list. Thanks for all of your help.

I like Mr Cavo’s method.

If this is for other purposes then I would use the vessel’s name and enter the CGMIX Coast Guard Port State Information Exchange

Last resort: Vessel Gross Tonnage Calculator or by formula 46 CFR 12.603 .

77.8’ x 20.7’ x 10.3’ x .67/100 = 111.14 tons

Thanks for the information. Would the 137 Gross Tons vessel I work on satisfy a Sea Service requirement that’s calling for time on vessels of 100 GRT or more? Thanks again.

This boat I work on is US Flagged.

I recommend looking at the GRT vs gt, Professional Mariner Forum Dec 2013 thread and Mr. Cavo’s post regarding the relationship between the two.

Thanks for the information jdcalvo. What is the National Maritime Center going to consider a 137 Gross Tonnage vessel to be for Gross Registered Tons?

Looking at the CG-719S form, it asks to list “Vessel Gross Tons”. I will put the 137 Gross Tons and will see what happens. See attached.

Seems that following Cavo’s guidance we both found our solution.

The “SIMPLIFIED MEASUREMENT GROSS TONNAGE” formulas?

The formulas I provided earlier were based on both the CFR and Simplified Measurement Gross Tonnage Guide to comply with the guidance for filling out the 719S form found in Documenting Sea Service on the NMC website. Based on my reading NMC is calculating Gross Tons as GRT. I believe that they will calculate for you given the Length, Beam and Draft based on the vessel type.

Let me know how you read the guidance.

Sorry for the run on sentence.

2 posts were split to a new topic: GRT/NRT has been replaced by GT/NT in all international trade since 1982

Your entire comment is completely irrelevant and off topic.

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Resurfaced video shows Bayesian yacht three years before sinking off Sicily

T he specifications of the superyacht which sank off the coast of Sicily have been unearthed as the search for survivors continues.

British tech tycoon Mike Lynch ’s Bayesian yacht was hit by a tornado over the ocean – known as a waterspout – off the coast of Porticello fishing village on Monday morning, causing it to sink after the mast snapped.

Follow Metro’s live blog for latest updates on the Sicily yacht sinking

One person, the yacht’s chef, has been found dead while six others – including Lynch, 59, his 18-year-old daughter Hannah and Morgan Stanley International chair Jonathan Bloomer – remain missing .

Christopher Morvillo, a lawyer for Clifford Chance, also remains unaccounted for.

The British-flagged Bayesian had 22 people on board, including 10 crew members. Now footage taken of the yacht in 2021 has reemerged.

Superyacht Times previously wrote a profile piece about the vessel, which was built by Italian firm Perini Navi and launched in 2008.

Details of the Bayesian

The yacht is 55.9m long and is 11.51m at its beam (widest point), a draught (depth of the vessel below the waterline) of 9.73m and an internal volume of 473 GT (gross tonnage).

Bayesian has an aluminium hull and superstructure, and is powered by two engines which give a top speed of 15.6 knots, with a cruising speed of 13 knots.

Its 57,000-litre fuel tanks mean it has a range of up to 3,600 nautical miles, and has water tanks storing up to 14,000 litres of fresh water, YachtCharterSalute reports .

Its interior architecture was designed by Rémi Tessier and most recently refitted in 2020. The cabins feature stunning modern bathrooms, and sleek wooden furniture with metal and accents.

The yacht previously sailed under the name ‘Salute’, and in total it has a capacity for 12 passengers and 10 crew.

There are six cabins below deck including one master cabin, three double and two twins.

The Bayesian has the largest aluminium mast and the second-tallest mast overall in the world, measuring in at 75m tall.

Its forward seating area can be converted into a fully enclosed glass veranda.

Get in touch with our news team by emailing us at [email protected] .

For more stories like this, check our news page .

Get your need-to-know latest news, feel-good stories, analysis and more by signing up to Metro's News Updates newsletter

NEWS... BUT NOT AS YOU KNOW IT

Resurfaced video shows Bayesian yacht three years before sinking off Sicily

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The specifications of the superyacht which sank off the coast of Sicily have been unearthed as the search for survivors continues.

British tech tycoon Mike Lynch ’s Bayesian yacht was hit by a tornado over the ocean – known as a waterspout – off the coast of Porticello fishing village on Monday morning, causing it to sink after the mast snapped.

Follow Metro’s live blog for latest updates on the Sicily yacht sinking

One person, the yacht’s chef, has been found dead while six others – including Lynch, 59, his 18-year-old daughter Hannah and Morgan Stanley International chair Jonathan Bloomer – remain missing .

Christopher Morvillo, a lawyer for Clifford Chance, also remains unaccounted for.

The British-flagged Bayesian had 22 people on board, including 10 crew members. Now footage taken of the yacht in 2021 has reemerged.

Superyacht Times previously wrote a profile piece about the vessel, which was built by Italian firm Perini Navi and launched in 2008.

Details of the Bayesian

The yacht is 55.9m long and is 11.51m at its beam (widest point), a draught (depth of the vessel below the waterline) of 9.73m and an internal volume of 473 GT (gross tonnage).

Bayesian has an aluminium hull and superstructure, and is powered by two engines which give a top speed of 15.6 knots, with a cruising speed of 13 knots.

Its 57,000-litre fuel tanks mean it has a range of up to 3,600 nautical miles, and has water tanks storing up to 14,000 litres of fresh water, YachtCharterSalute reports .

Its interior architecture was designed by Rémi Tessier and most recently refitted in 2020. The cabins feature stunning modern bathrooms, and sleek wooden furniture with metal and accents.

The yacht previously sailed under the name ‘Salute’, and in total it has a capacity for 12 passengers and 10 crew.

There are six cabins below deck including one master cabin, three double and two twins.

The Bayesian has the largest aluminium mast and the second-tallest mast overall in the world, measuring in at 75m tall.

Its forward seating area can be converted into a fully enclosed glass veranda.

Get in touch with our news team by emailing us at [email protected] .

For more stories like this, check our news page .

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