Will database size be changed after Oracle Upgrade (from 8i to 10g)?

I am upgrading Oracle 8i to Oracle 10g for my client. A shared storage (EMC Disk system) wil be used for the upgrade.

The database size for Oracle 8i is 80GB. (all files under oradata)

I would like to know, will the database size remain more or less the same after data migrated to Oracle 10g (i.e. The database size for Oracle 10g is approx. to 80GB)?

I need this figure to calculate the disk space for the EMC Disk System.
Thank you very much if anyone could help!!!

the database will remain about the same apart from adding a new sysaux tablespace and a new undo tablespace

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I would like to know, will the database size remain more or less the same after data migrated to Oracle 10g (i.e. The database size for Oracle 10g is approx. to 80GB)?

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The size will be increased because the default initran value for table in 8i is 1, whereas it's 2 in 10g. I do not know migration utility will take care of this.
Keep watch on big tables.