List with calculated column based on data in row?

Tom898 Try using calculated column formula like: 

=IF(OR([Product]="Product 1",[Product]="Product 2",[Product]="Product 3"),([AUG]-[JUL])/30,([AUG]-[JUL])/45)

OR 

=IF(OR([Product]="Product 1",[Product]="Product 2",[Product]="Product 3"),([AUG]-[JUL])/30,IF(OR([Product]="Product 4",[Product]="Product 5"),([AUG]-[JUL])/45,""))

Note:

1. Sometimes comma( , ) does not work in formula (it is based on language or regional settings of your SharePoint site). So in that case use semicolon( ; ) instead of comma( , ).
2. Use correct display name of your SharePoint columns in above formula.
3. Wrap column names inside [] if your column name has space in it. For example: [My Column Name].

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