Determining size of SharePoint sites / site collections

General Question

How to get the size (in bytes) of each site collection in SharePoint?

Answers

stsadm -o enumsites -url http://url

Example

<Sites Count="1">

  <Site

    Url="http://url"

    Owner="DomainName\user"

    SecondaryOwner="DomainName\user2" 

    ContentDatabase="WSS_Content_DB"

    StorageUsedMB="13756"

    StorageWarningMB="0"

    StorageMaxMB="0" />

</Sites>

Save to Notepad (.txt) file

stsadm -o enumsites -url "http://url"  > c:\sites.txt