Select SQL Server database size

Question

how can i query my sql server to only get the size of database?

I used this :

use \"MY_DB\"
exec sp_spaceused

I got this :

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Answer 1

Also compare the results with the following query's result

EXEC sp_helpdb @dbname= 'MSDB'

It produces result similar to the following

There is a good article - Different ways to determine free space for SQL Server databases and database files