I decided to attempt to make an average stat calculator in excel for FE Fates. Unfortunately it can't account for uses of Heart/Partner/Friendship seal, but probably works for Master Seal.
Boxes in Orange can be edited, the rest are locked via Password (password is fates).
I'm not 100% certain on how accurate the calculations are, but they seem to match up for the Kamui I have at the moment.
Feel free to make modifications to the spreadsheet if needed
And apparently I can't attach an excel file..
Put it in dropbox for now
https://www.dropbox.com/s/jx6v27ydow2metf/FE%20Fates%20Stat%20Average%20Calculator.xlsx?dl=0