I know I have seen this on here before but I have looked and looked and gave up. What is the rule of thumb when helping a bride figure how many servings of cake she will need? I know I saw that you figure the number of servings based on a percentage of the invites that they sent out or something along those lines.

Thank you for your help.

This may help:

http://cateritsimple.blogspot.com/2009/07/debis-60-rule-or-why-rsvps-dont-work.html