How much people can fit on the titanic
None since its at the bottom of the ocean, the water pressure would kill them.
1500 people went into the sea when Titanic sank, and only 6 people were saved. So the answer to your question is over 1500 people can (fit) but probably not have their own rooms.
There was room for 2,435 passengers and 892 crewmen for a total of 3,327 people. But there were less people than that when the Titanic sank.