How to get size of your SharePoint site

In MOSS2007 we can get to the STSADM by opening windows command prompt and changing directory to:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\BIN
In SharePoint 2010 we can find this at location:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN

Now to get the size of your site type the following command on the prompt:
STSADM.exe -o enumsites -url http:// <sitename>
It will display the size of your site under the tag “StorageUsedMB”.

Source: www.mindfiresolutions.com/How-to-get-size-of-your-SharePoint-site-1505.php