How to obtain the size of all Tables in a SQL Server Database

To give you the number of rows and the size the tables in your database you are using currently. This Transact-SQL statement below uses the dynamic management view sys.dm_db_partition_stats to provide this information as - (estimated) row count - used size in kilo byte - reserved size in kilo byte

SELECT AS SchemaName 
      , AS ObjName 
      ,OBJ.type_desc AS ObjType 
      , AS IndexName 
      ,INDX.type_desc AS IndexType 
      ,PART.partition_number AS PartitionNumber 
      ,PART.rows AS PartitionRows 
      ,STAT.row_count AS StatRowCount 
      ,STAT.used_page_count * 8 AS UsedSizeKB 
      ,STAT.reserved_page_count * 8 AS RevervedSizeKB 
FROM sys.partitions AS PART 
     INNER JOIN sys.dm_db_partition_stats AS STAT 
         ON PART.partition_id = STAT.partition_id 
            AND PART.partition_number = STAT.partition_number 
     INNER JOIN sys.objects AS OBJ 
         ON STAT.object_id = OBJ.object_id 
     INNER JOIN sys.schemas AS SCH 
         ON OBJ.schema_id = SCH.schema_id 
     INNER JOIN sys.indexes AS INDX 
         ON STAT.object_id = INDX.object_id 
            AND STAT.index_id = INDX.index_id