In this article, I will try to give information about calculating the available disk size in SQL Server.

You can easily do this using the code below.

SELECT Drive,
       TotalSpaceGB,
       FreeSpaceGB,
       PctFree
FROM
(
    SELECT DISTINCT
           SUBSTRING(dovs.volume_mount_point, 1, 10) AS Drive,
           CONVERT(INT, dovs.total_bytes / 1024.0 / 1024.0 / 1024.0) AS TotalSpaceGB,
           CONVERT(INT, dovs.available_bytes / 1048576.0) / 1024 AS FreeSpaceGB,
           CAST(ROUND(
                         (CONVERT(FLOAT, dovs.available_bytes / 1048576.0)
                          / CONVERT(FLOAT, dovs.total_bytes / 1024.0 / 1024.0) * 100
                         ),
                         2
                     ) AS NVARCHAR(50)) + '%' AS PctFree         
    FROM sys.master_files AS mf
        CROSS APPLY sys.dm_os_volume_stats(mf.database_id, mf.file_id) AS dovs
) AS DE;

When you run the above code, you will see a result similar to the one below.

As you can see, the available disk size has been calculated.

Good luck to everyone in business and life.

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