user638: 
Possible Duplicate:
How many transactions have been included into the blockchain? 

The question explains itself.

user120: According to my blockchain dump there are 10'876'856 transactions with at least 1 confirmation as of block 21'5753. That is excluding double spends and memorypool not yet confirmed.

user2281: You can chek this and other statistics in:
http://blockchain.info/
With the available data, the simplest way is taking the number of blocks:
http://blockchain.info/q/getblockcount
and the average number of transactions per block:
http://blockchain.info/q/avgtxnumber
and multiply them. As I'm writing I get 215749*238=51348262 transactions.
The daily number of transactions is also online:
http://blockchain.info/charts/n-transactions?showDataPoints=true&timespan=&show_header=true&daysAverageString=1&scale=0&address=
You could write some code to count the transactions directly from you local copy of the blockchain, but if you want a fast figure the links I've written are enough.

638: <blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="https://bitcoin.stackexchange.com/questions/5564/how-many-transactions-have-been-included-into-the-blockchain">How many transactions have been included into the blockchain?</a>  </p>
</blockquote>



<p>The question explains itself.</p>
 120: <p>According to my blockchain dump there are 10'876'856 transactions with at least 1 confirmation as of block 21'5753. That is excluding double spends and memorypool not yet confirmed.</p>
 2281: <p>You can chek this and other statistics in:
<a href="http://blockchain.info/" rel="nofollow">http://blockchain.info/</a></p>

<p>With the available data, the simplest way is taking the number of blocks:
<a href="http://blockchain.info/q/getblockcount" rel="nofollow">http://blockchain.info/q/getblockcount</a>
and the average number of transactions per block:
<a href="http://blockchain.info/q/avgtxnumber" rel="nofollow">http://blockchain.info/q/avgtxnumber</a>
and multiply them. As I'm writing I get 215749*238=51348262 transactions.</p>

<p>The daily number of transactions is also online:
<a href="http://blockchain.info/charts/n-transactions?showDataPoints=true&amp;timespan=&amp;show_header=true&amp;daysAverageString=1&amp;scale=0&amp;address=" rel="nofollow">http://blockchain.info/charts/n-transactions?showDataPoints=true&amp;timespan=&amp;show_header=true&amp;daysAverageString=1&amp;scale=0&amp;address=</a></p>

<p>You could write some code to count the transactions directly from you local copy of the blockchain, but if you want a fast figure the links I've written are enough.</p>
