Formula to Figure Out Range?

Also is there an easy way to figure out the difference w/wo buffs? Because I will have a different level of Ignis Lore tomorrow as well to figure out buffed.

It's not so much a problem to deserve having shortcuts developed, really. There are just... if I remember correctly, 5 or so arithmetic operations.

One suggestion for doing this is creating a spreadsheet (Microsoft Excel, OpenOffice Calc, GoogleDocs Spreadsheet, etc...) and automate everything.

 How to do that

Pre-made template
Fill in your stats (remember to factor in %stat, %atk, empress/spirit buff, etc...)

Note: I'm ignoring Dagger's nuances because I don't like shads.