select * from sys.dm_os_performance_counters

  select counter_name,cntr_value from sys.dm_os_performance_counters where 
  object_name like '%Buffer Manager%'  and counter_name like '%buffer%'

counter_name                                                                                                                     cntr_value
-------------------------------------------------------------------------------------------------------------------------------- --------------------
Buffer cache hit ratio                                                                                                           529373
Buffer cache hit ratio base                                                                                                      529388

(2 rows affected)

BufferCacheHitRatio
---------------------------------------
99.9971665394758

(1 row affected)