I use HotRod's calculator. It has an adjust Nicotine Levels tool in it that is very simple to use.
ECF thread here (the newest active link can be hard to find in the very large thread):
http://www.e-cigarette-forum.com/forum/diy-e-liquid/480587-new-calculator-try.html
Direct download link here:
https://drive.google.com/folderview?id=0ByHCyknRKMBCTjQ0d0pEWklsSnc&usp=sharing
That is the one I use for my DIY, but that is overkill for what 69CamaroSS wants.
69CamaroSS, make your own spreadsheet. Going to number cells, but you can do that however you want:
Cell A:1 label "Desired nic level"
Cell B:1: input a level, say 6 to use for an example
Cell A:2 label "Level of base nicotine"
Cell B:2 put in 100
Cell A:3 label "Number of ml's to make"
Cell B:3 put in an example number, say 60
Cell A:4 label "ml's of nic base needed"
Cell B:4 put in this formula (you can copy and paste from my post) =(B:1/B:2)*B:3 If using Google Docs: (B1/B2)*B3
Cell A:5 label "ml's of flavor needed"
Cell B:5 put in =B:3-B:4 If using Google Docs B3-B4
Done.
Here is what it would look like:
