In my profile I see
top n% this quarter. For some users I see
top n% overall. How can I know my top overall ranking?
If the percentile doesn't show you can calculate it yourself.
This is the formula:
(100 * R) / U
R is your current position in the ranking, and
U the total number of users (take the number next to +1 from the list (Total Reputation*).
For me that is (100 * 2) / 2214 = .09%