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I've looked on the Stack Exchange site and the Data Explorer, and I can't seem to find the number of unique users on the entire stack exchange system. It maybe that these numbers don't exist, but it seems like you just have to count the number of valid unique open-ids across every stack exchange site and you have it. Maybe I'm being silly and these numbers are easy to find.

Can anyone help me to find a query or statistic page that gives me this info?

Edit, simplification: Where can I find the closest count of the total number of people on planet earth who have a single stack exchange account?

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2 Answers 2

up vote 4 down vote accepted

It is listed here now, on the sidebar:

http://stackexchange.com/sites

Network Stats

  • 46 Q&A sites
  • 809,534 users
  • 1.7 million questions
  • 4 million answers
  • 2 million visits per day
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This information is not anymore given. Actually, with the new theme, I don't see any sidebar. –  kiamlaluno May 14 '12 at 14:42
    
@kia it is on the homepage stackexchange.com right now it says "82 Q&A sites, 1.8 million users, 3.7 million questions, 7.6 million answers" –  Jeff Atwood May 14 '12 at 16:45

This is easy to do with the API:

  1. Retrieve a list of all the sites with StackAuth: http://stackauth.com/1.0/sites
  2. For each of the sites (with state == 'normal'), call:

    http://api.site-domain/1.0/stats

    ...and extract the total_users field.

  3. Then add up the user numbers.
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2  
Will this method prevent users that have accounts on different stack exchange sites under the same openId from being counted multiple times? Or is it simply counting the number of users on each site and adding them together? –  Mark Rogers Feb 4 '11 at 17:21
    
@Mark: the latter. As for unique users, you may be able to use this tool: stackusers.com (But I don't really know.) From the tools there, it looks like '402086'. –  uɐɯsO uɐɥʇɐN Feb 4 '11 at 20:43
    
A month later the number is 402116, so that can't be accurate, since I sincerely doubt that the stack exchange system only added 30 users in one month. –  Mark Rogers Mar 10 '11 at 20:13

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