T-SQL to find out Space by File Group

T-SQL script to find out SQL SERVER FileGroup space details:

SELECT
 fg.groupname AS 'File Group',
 Name, 
 CONVERT (Decimal(15,2),ROUND(f.Size/128.000,2)) 
  [Currently Allocated Space (MB)],
 CONVERT (Decimal(15,2),
 ROUND(FILEPROPERTY(f.Name,'SpaceUsed')/128.000,2))
  AS [Space Used (MB)],
 CONVERT (Decimal(15,2),
 ROUND((f.Size-FILEPROPERTY(f.Name,'SpaceUsed'))/128.000,2))
  AS [Available Space (MB)]
FROM dbo.sysfiles f (NOLOCK)
JOIN sysfilegroups fg (NOLOCK) ON f.groupid = fg.groupid
ORDER BY fg.groupname