How much does a ocean liner weigh?

Since each ship is different, they all have different weights. A few are what is known as sister ships, such as the RCL Oasis of the Seas and the Allure of the Seas, meaning they are pretty much built from the same plans. Thus you will generally find sister ships being advertised as having the same weight. For those two, the weight is 210,000 Gross Registered Tons.