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[klaasic]

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[nstokes7]

27 million people trading bitcoins wow so much.

[axxo]

It may reached around 40 million in the coming months because of the fast growing popularity of bitcoins around the world.  

[kolesozw]

Therocktrading.com an Justcoin.com claim to have about 7000 registered users each.
The Rock's 24h Volume is at about 60 BTCs and Justcoin is at about 90 BTCs/24h (http://bitcoinwatch.com/).
Combining the number of users and the 24h Volume and dividing it by 2 we arrive at an average of ~0,01 BTC traded in the last 24h per member.
Comparing this to the BTCs traded in the last 24h at btcchina.com results in a number of ~9 million users for BTC-China.
Given that BTC-China makes up about one third of the entire volume of all markets (http://bitcoincharts.com/charts/volumepie/) we arrive at an overall estimate of 27 million people trading bitcoins at exchanges.

I doubt about these extrapolations because traders are at the big exchanges and their daily volume is much bigger...

Maybe bit above 1 million users total

[WayTooGosu]

It is likely almost everyone on this forum uses Bitcoins.

[aleprok]

It is quite hard to estimate the real amount of bitcoin users.

Counting bitcoin wallet download amount can not give trustworthy user count as one person can download the same file multiple times over time.
Counting bitcoin addresses are not trustworthy count because every user can create multiple addresses at the same time and user can have zero addresses.
Counting connected nodes is not trustworthy count because it will not count web wallets nor people who do not broadcast their ip.
Counting web wallet users will not give trustworthy count because user can have multiple web wallets.
Counting transactions will not give trustworthy count because addresses are created and destroyed and one user use one address per one transaction.

So all in all it is pretty impossible to count amount of users, but these statistics do tell about the popularity of bitcoins.

[manoamano]

27 million people trading bitcoins wow so much.

It is probably over valued.
1 people can be counted several times

[ajax3592]

27 million people trading bitcoins wow so much.

It is probably over valued.
1 people can be counted several times

Exactly the day traders, buy and sell several times a day. 27 million seems unrealistic for now.

[Sindelar1938]

well in the millions now

[niothor]

It may reached around 40 million in the coming months because of the fast growing popularity of bitcoins around the world.  

How can there be 40 millions users with 27 million transactions in the blockchain?

[niothor]

Therocktrading.com an Justcoin.com claim to have about 7000 registered users each.
The Rock's 24h Volume is at about 60 BTCs and Justcoin is at about 90 BTCs/24h (http://bitcoinwatch.com/).
Combining the number of users and the 24h Volume and dividing it by 2 we arrive at an average of ~0,01 BTC traded in the last 24h per member.
Comparing this to the BTCs traded in the last 24h at btcchina.com results in a number of ~9 million users for BTC-China.
Given that BTC-China makes up about one third of the entire volume of all markets (http://bitcoincharts.com/charts/volumepie/) we arrive at an overall estimate of 27 million people trading bitcoins at exchanges.

Trading doesn't mean use.....
The whole blockchain has around 27 millions transactions , and there are only 100 000 new ones added daily (although decreasing to 90k yesterday).
So actual number of users , of people holding bitcoins and using them , not going over a get rich fast scheme is far lower.

[hoewer4what]

Ok since Mt.Gox just recently anounced it only has 1 million customers it seems that my first estimate was completely wrong.
Considering Mt.gox's marketshare I guess 5 millions would be more realistic number.

Probably 2-3 millions. Many have account at Mt.gox but because Mt.gox's withdrawal delays most moved to different exchanges I guess