The "Power of One" technique

First bow and give thinks to the DemiGod of Analytics Tom Tobin.

Then create a new custom field on every object that you want to report on.

Select:

Datatype = FORMULA

Result = NUMBER (0 decimals)

Formula = 1 that's it, just a number one.

Then add the new "Power of One" fields to your reports and select Summarize(SUM) and behold!