Simple query to find the size of the indexes
SELECTOBJECT_NAME(i.OBJECT_ID) AS TableName,i.name AS IndexName,i.index_id AS IndexID,8 * SUM(a.used_pages)/1024 AS 'IndexSize in KB'FROM sys.indexes AS iJOIN sys.partitions AS p ON p.OBJECT_ID = i.OBJECT_ID AND p.index_id = i.index_idJOIN sys.allocation_units AS a ON a.container_id = p.partition_idWHERE i.object_id = object_id ('yourTableName')--- put the table name hereGROUP BY i.OBJECT_ID,i.index_id,i.name