This app was mentioned in 1 comment, with an average of 1.00 upvote
Shameless plug to my chess rating calculator app: https://play.google.com/store/apps/details?id=com.gmhafiz.gmratingcalculator
Method to calculate rating change is present at fide's website. Should be easy enough to put it into excel. http://www.fide.com/component/handbook/?id=172&view=article