How to computer the row size of a table

Hi
How can i compute the row size of a table. My general Idea is
create table emp(
empno number(4),
ename varchar2(10),
hire_date date,
update_yn timestamp);
the character set is UFT8
how can i compute the size of this table
thanks

Hi,
for Avg. row length see this
SQL> desc dba_tables
Name                                      Null?    Type
OWNER                                     NOT NULL VARCHAR2(30)
TABLE_NAME                                NOT NULL VARCHAR2(30)
TABLESPACE_NAME                                    VARCHAR2(30)
CLUSTER_NAME                                       VARCHAR2(30)
IOT_NAME                                           VARCHAR2(30)
PCT_FREE                                           NUMBER
PCT_USED                                           NUMBER
INI_TRANS                                          NUMBER
MAX_TRANS                                          NUMBER
INITIAL_EXTENT                                     NUMBER
NEXT_EXTENT                                        NUMBER
MIN_EXTENTS                                        NUMBER
MAX_EXTENTS                                        NUMBER
PCT_INCREASE                                       NUMBER
FREELISTS                                          NUMBER
FREELIST_GROUPS                                    NUMBER
LOGGING                                            VARCHAR2(3)
BACKED_UP                                          VARCHAR2(1)
NUM_ROWS                                           NUMBER
BLOCKS                                             NUMBER
EMPTY_BLOCKS                                       NUMBER
AVG_SPACE                                          NUMBER
CHAIN_CNT                                          NUMBER
AVG_ROW_LEN NUMBER
AVG_SPACE_FREELIST_BLOCKS                          NUMBER
NUM_FREELIST_BLOCKS                                NUMBER
DEGREE                                             VARCHAR2(10)
INSTANCES                                          VARCHAR2(10)
CACHE                                              VARCHAR2(5)
TABLE_LOCK                                         VARCHAR2(8)
SAMPLE_SIZE                                        NUMBER
LAST_ANALYZED                                      DATE
PARTITIONED                                        VARCHAR2(3)
IOT_TYPE                                           VARCHAR2(12)
TEMPORARY                                          VARCHAR2(1)
SECONDARY                                          VARCHAR2(1)
NESTED                                             VARCHAR2(3)
BUFFER_POOL                                        VARCHAR2(7)
ROW_MOVEMENT                                       VARCHAR2(8)
GLOBAL_STATS                                       VARCHAR2(3)
USER_STATS                                         VARCHAR2(3)
DURATION                                           VARCHAR2(15)
SKIP_CORRUPT                                       VARCHAR2(8)
MONITORING                                         VARCHAR2(3)
CLUSTER_OWNER                                      VARCHAR2(30)
DEPENDENCIES                                       VARCHAR2(8)
SQL> Regards!

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