Azure Storage Table size
There is a tool which can get table size or entities count for you. Azure Storage Manager
- Select a storage table in left tree pane
- Click 'Property' button
- Click 'Calc' button on the table properties dialog
- Wait a few moment, till 'Calc' button becomes available again.
If you're not interested in getting a breakup by blob container, you don't have to write the code as far as finding the blob storage size is concerned. This information is available to you via storage analytics (http://msdn.microsoft.com/en-us/library/windowsazure/hh343270.aspx). The table of interest to you would be $MetricsCapacityBlob (http://msdn.microsoft.com/en-us/library/windowsazure/hh343264.aspx).
Coming to tables, unfortunately no such thing is available and you would need to fetch all entities and calculate the size of each entity to find the table size. You may find this blog post useful in calculating the size of an entity: http://blogs.msdn.com/b/avkashchauhan/archive/2011/11/30/how-the-size-of-an-entity-is-caclulated-in-windows-azure-table-storage.aspx.
HTH.