Where are formulas being used

I am trying to find out if there is a PSQL query or a report that I can run that will show me where formulas are being used - or if they are.  So, if a formula is being used, is it used in another formula, report, etc.  I have 100's of formulas & reports.  The thought of having to open every report to see what formulas it is using sounds painful @ best. 

Any & all help would be greatly appreciated!