query to calculate database size in sql server code example

Example 1: sql database size

SELECT
    d.name AS 'Database',
    m.name AS 'File',
    m.size,
    m.size * 8/1024 'Size (MB)',
    SUM(m.size * 8/1024) OVER (PARTITION BY d.name) AS 'Database Total',
    m.max_size
FROM sys.master_files m
INNER JOIN sys.databases d ON
d.database_id = m.database_id;

Example 2: sql database size

EXEC sp_databases;