Symantec Backup Exec Sizing Tool

 HI All

I am looking for a sizing tool for Symantec Backup Exec?

Something like the following:
enter current size of server hard disks.
enter compression Ratio
= Size of base
then add estimate growth of data per day
= Size of incremental taken
number of days per RPS
number of RPS's kept
= Total Size of Backup Storage location

is there something like this out there?

If not how would i go about making one?