Weights and Balances...

So you know how "one cup" of flour can actually contain completely different volumes depending on things like humidity and how you measure it? Well, then you would know that measuring flour by weight is wayyy more reliable. Really, it's the only thing people should be doing.
If, however, you're going off of a recipe listing measurements only by volume, you can use this handy website to convert over. Then just write yourself a note about how many ounces of flour the recipe should use, and off you go!
Om nom...