Get All Database with respective sizes from your Server

with fs

as

(

    select database_id, type, size * 8.0 / 1024 size

    from sys.master_files

)

select

    name,

    (select sum(size) from fs where type = 0 and fs.database_id = db.database_id) DataFileSizeMB,

    (select sum(size) from fs where type = 1 and fs.database_id = db.database_id) LogFileSizeMB

from sys.databases db

OR

EXEC sp_MSforeachtable @command1="EXEC sp_spaceused '?'"