user24556: 
Has someone calculated the avarage block size (e.g., for a day)?
On blockchain.info there are a few blocks listed with their size, on the top of the page :/

user21790: Here's your answer!
Blockchain.info provides the average block size.

24556: <p><br/>
Has someone calculated the avarage block size (e.g., for a day)?<br/>
On blockchain.info there are a few blocks listed with their size, on the top of the page :/</p>
 21790: <p>Here's <a href="https://blockchain.info/charts/avg-block-size" rel="nofollow">your answer</a>!
Blockchain.info provides the average block size.</p>
