How much memory sql server is using

Hi Experts,
I want to know how much of RAM is currently used by sql server.
is there a query for the same?
we are using sql server 2008 R2 SP2 on windows server 2008 R2 with a RAM of 48 GB. min memory as 40, max memory as 43GB.
thanks in advance.
Cheers, Vinod Mallolu

Hi Shanky
Thanks for the info. Perhaps you can clarify something for me on it.
If I run this on one of my production servers:
SELECT object_name, cntr_value MemoryUsageKB, cntr_value/1024 MemoryUsageMB,cntr_value/1024/1024 MemoryUsageGB
FROM sys.dm_os_performance_counters
WHERE counter_name = 'Total Server Memory (KB)';
select physical_memory_in_use_kb,
(physical_memory_in_use_kb/1024) as Phy_mem_MB,
(virtual_address_space_committed_kb/1024) as Total_mem_MB--memory pagefile+physical memory
from sys.dm_os_process_memory
I get this:
object_name
MemoryUsageKB
MemoryUsageMB
MemoryUsageGB
SQLServer:Memory Manager
118488256
115711
112
physical_memory_in_use_kb
Phy_mem_MB
Total_mem_MB
118363564
115589
231792
As I have LPIM enabled I'm surprised at the Total_mem_MB result, page file usage is at 0.09%. Any idea why it would be reported like that?
I'm also surprised that the DMV is reporting a lower number for physical memory usage than the perfmon counter, but I guess they're not measuring the exact same thing.
Edit: Version is SQL 2012 SP2 CU2....should have included that :)

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