Find the Table size in oracle

Find the Table size in oracle

SET VERIFY OFF
SET LINESIZE 200

COLUMN owner FORMAT A20
COLUMN table_name FORMAT A30

SELECT t.table_name,
       t.tablespace_name,
       t.num_rows,
       t.avg_row_len,
       t.blocks,
       t.empty_blocks,
       ROUND(t.blocks * ts.block_size/1024/1024,2) AS size_mb
FROM   dba_tables t
       JOIN dba_tablespaces ts ON t.tablespace_name = ts.tablespace_name
WHERE  t.owner = UPPER('&1')
ORDER BY t.table_name;