I originally found an XLS spreadsheet in some thread in some forum, I think here. I've converted it to a google spreadsheet, though some of the original entries are not used in my version (and I cannot find the original to fix). However, this does provide some useful calculations if you want to get to the nitty gritty of almost everything. I'll probably strip out a bunch of stuff eventually to simplify it. It is a public url and you can copy to your own google account, or export to XLS, to edit with your own values.
The values are my actual weights from sept/nov 2015, for my 2014 F150 Lariat and my 2011 27FB.