You know sometimes it is only because I have to hit an even number for my final %. If I am without my personal ejuice calculator, I have a quick reference guide for my tester’s %s and the difference for my VG’s SGs.
I’m sure that really didn’t make any sense, hell I couldn’t even type it! Basically I have a chart in my little black book of recipes from 1% flavoring up to 20% flavoring. So in example…
1% = 12.49g VG
2% = 12.36
3% = 12.24
20% = 10.09
That way I can quickly write up recipes for 10 ml tester (makes the math on %s uber easy) and just reference the chart to see how much base I need to add…feel me?
So when I am being to lazy to type up a recipe and get my #s that way, I like to keep the recipes even. So when I add up my final %s and find 14.6 as my total, I will just put that .4 difference somewhere else to have an even 15.
When this isn’t the case, I’m normally thinking a flavor needs just a slight boast. So 1.5 becomes 1.6 or 1.8, etc etc