Many time for a new DBA hard to find how much My Server utilising memory? Here is explained a number of ways to find the memory utilized by SQL server.
By Using Performance monitor:
Go to Start–>Run and type perfmon . You will find the following screen where you can see the total memory used(the pages/sec) by your box.
By Using DMV:
You can Query to sys.dm_os_memory_clerks DMV to find out Memory utilization by SQL server. To see how see the following link.
By using SQL Reports:
Right Click on SQL Server–>reports–>Standard Reports–> Memory Consumption
See the Following image.