Get the size of a table in sql server

With the help of below sql script 

SELECT     t.NAME AS TableName,     s.Name AS SchemaName,     p.rows AS RowCounts,                 SUM(a.total_pages) as nubmerofpages,     SUM(a.total_pages) * 8 AS TotalSpaceKB,     SUM(a.used_pages) * 8 AS UsedSpaceKB,                 a.type_desc,     (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB FROM     sys.tables t INNER JOIN          sys.indexes i ON t.OBJECT_ID = i.object_id INNER JOIN     sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id INNER JOIN     sys.allocation_units a ON p.partition_id = a.container_id LEFT OUTER JOIN     sys.schemas s ON t.schema_id = s.schema_id WHERE                 t.Name='Emp'     AND t.is_ms_shipped = 0     AND i.OBJECT_ID > 255 GROUP BY     t.Name, s.Name, p.Rows,a.type_desc ORDER BY     t.Name