In general the size of a large yacht is measured by its length, but a more accurate factor is the displacement of a yacht.
The displacement is the weight of water that a ship displaces when it is floating, which in turn is the weight of a ship (and its contents). The displacement is measured in tons.
The yacht Dilbar is currently considered to be the biggest private yacht in the world. With a length of 157 meter (512ft) the mega yacht is number #4 on the ‘list by length’, but with a displacement tonnage of 15.917 gross tons, she is actually the largest yacht in the world. Who owns the biggest yacht in the world? Russian billionaire Alisher Usmanov owns the biggest yacht in the world.
Only the world’s richest billionaires are able to purchase and maintain these big private yachts. Read our list of the World’s Richest Yacht Owners.
Most of these (largest) yachts are owned by Royal Families, such as the Al Nahyan family, rulers of Abu Dhabi, who own three of the worlds largest yachts and the Sultan of Oman, who owns two. Also Russian billionaires own large yacht, Dilbar for example is owned by Alisher Usmanov.