how to find the database size and what are views i need to include.

 Hi Frnds,
 I want to calculate my database size. So, What are views I need to include.
 My question is
 Generally, we will include database files like datafiles ,tempfiles and logfiles.
 what about controlfile ?
 If we need to include controlfile means how to calculate the size of the controlfile??


 If anyhow provide me the script to calculate, that will be much more helpful for me .
 need ur suggestion.

Thanks
Muhammed thameem. S