Something

set echo off heading off pagesize 0
select  a.TABLESPACE_NAME,
        a.BYTES/(1024*1024) bytes_used_MB,
        b.BYTES/(1024*1024) bytes_free_MB,
        b.largest/(1024*1024) largest_MB,
        round(((a.BYTES-b.BYTES)/a.BYTES)*100,2) percent_used
from
        (
                select  TABLESPACE_NAME,
                        sum(BYTES) BYTES
                from    dba_data_files
                group   by TABLESPACE_NAME
        )
        a,
        (
                select  TABLESPACE_NAME,
                        sum(BYTES) BYTES ,
                        max(BYTES) largest
                from    dba_free_space
                group   by TABLESPACE_NAME
        )
        b
where   a.TABLESPACE_NAME=b.TABLESPACE_NAME
order   by ((a.BYTES-b.BYTES)/a.BYTES) desc
/
exit