To get the current Database and Log Filesize using MSSQL you can use the snippet below. Tested using SQL Server 2012.
Sample MSSQL
with database_files_CTE as ( select name, type_desc, physical_name, size_mb = convert(decimal(11, 2), size * 8.0 / 1024), space_used_mb = convert(decimal(11, 2), fileproperty(name, 'spaceused') * 8.0 / 1024) from sys.database_files ) select name,type_desc as [type],physical_name as [path],size_mb as [Filesize],space_used_mb as [Filesize used], case size_mb when 0 then 0 else convert(decimal(5, 2), space_used_mb / size_mb * 100) end as [Filesize used %] from database_files_CTE;