-- SQL Script for all tables:
SELECT
O.name AS TableName
,P.rows AS TotalRows
,SUM(AU.used_pages)*8 AS SizeInKB
FROM sys.objects AS O
JOIN sys.indexes AS I
ON O.object_id = I.object_id
JOIN sys.partitions AS P
ON O.object_id = P.object_id
JOIN sys.allocation_units AS AU
ON AU.container_id = P.partition_id
WHERE O.type = 'U'
AND I.index_id IN (0,1)
GROUP BY O.name, P.rows
ORDER BY 3 DESC
-- Using sp_spaceused
sp_spaceused 'Table_Name'
GO
-- Using DBCC SHOWCONTG
DBCC SHOWCONTIG ('Table_Name') WITH tableresults
GO