How big were The Beatles?

Arguably the biggest band in the history of music, but exactly how big were they? If possible, can their popularity be put into today's standards of famous musicians? (e.g., Taylor Swift, The Weeknd, BLACKPINK, Justin Bieber, etc.) I had a teacher who was huge on the group in grade 5, but I never got the chance to ask him how famous they were before advancing to the next grade.

Also when I say big, I mean in terms of popularity, NOT influence (that's very apparent), thank you!