That's the calculator I use. For the % of flavoring I'd enter about 8 or 10 percent. All flavorings are a little different, and some of the super concentrated ones out these days are really strong. Maybe start with 5% and go up. Keep in mind that when you put in your percentage for flavoring, that means TOTAL flavoring, not each flavor. So if you're using three different flavors, you divide the amount it says for flavoring among all the different flavorings you're using. So if it calls for 1 ml (20 drops) of flavoring, you'd need to use about 6 or 7 drops of each of the flavors to end up with about 20 drops total. You probably know that, but that was something that kinda messed with my head at first.