How big is Hogwarts School of Witchcraft and Wizardry?

How big is the castle at Hogwarts? If the foyer is big enough to hold a whole house (Sorcerer's Stone, Chapter 7) and the auditorium is bigger, it will be really huge. On the other hand, Harry often sees many people in the corridor and implies that these people are crowded here, which obviously means that it is actually quite narrow, even if you accept that there are thousands of students (many evidences show that the actual number of students is far less than this number). Neil Ward solved this problem in an article published on the website of HP4GU (adult Harry Potter). He said:

"In my opinion, Hogwarts is a castle with the ability to change the size, shape and room layout according to needs:

"There are always 142 stairs at Hogwarts. Some are wide and big; Some are narrow and small, wobbly; Some people go to different places on Friday ... others are not real doors at all, but solid walls that look like doors. It is not easy to remember what is where, because everything seems to keep moving ... "(Chapter 8 of the Sorcerer's Stone).

Perhaps, unused places or places with few people will reduce the area, or be closed (like a secret room), or become "invisible". Of course, this makes the function of the marauder's map more magical, but maybe that's why they need such a map. Filch has no magic. He may need Mrs. loris as his guide in the castle, because otherwise, he may often get lost. In other words, from the magic point of view, Filch is a "blind man" and Mrs. loris is his "guide cat".

We know that some places, such as diagon alley, can coexist with the Muggle world. In the Muggle's eye world, there is indeed a Hogwarts Castle-an unchangeable "abandoned" castle. Hogwarts in the wizarding world may be perceptive (just as a computer has some hardware that can perform operations, and some variable "memories" and the ability to create virtual environments). I think some rooms have the same structure as the Muggle world, while others, such as Dumbledore's office, the room with the mirror of Eris and the room full of chamber pot, exist in a magic level parallel to the Muggle world and can appear at any time when needed.

So the scale of Hogwarts is variable.

I'm a huge fan of Harry Potter, and I also like geography. It's really surprising to see such a problem in geographical classification.