How to calculate which server is needed for the site?

Question

RAM

Good afternoon
How to roughly calculate what server is needed for the site?
Given
Site - approximately 1 million users - daily traffic
Information on the site - mostly text - i.e. not video and not working with video
From each visitor there will be an average of 100 requests to the server per "session" - then the user leaves the site
I understand that stupid question, and so on - but at least approximately

Answer 1

16-32 GB of memory, 32 is better, ssd disk the
rest - how much the budget will last
(percentage, in general, is unimportant)