Another helpful thing is if your recipe is in a formula is to use grams (its more precise when making smaller batches IMO). If not, you can always convert it (herbalsoapsbyrj.com has a lot of good calculators to do so). I also have a small scale that measures to 1/100th of a gram which I could not live without. I now do all my formulating for any soap/B&B in grams. When I package to sell or ship, then I use lbs/oz....but otherwise I stick with grams. It is also a lot easier to take a formula to grams than a formula to ounces in my opinion. For instance say you are making 100 grams and it calls for 35% well that ends up being 35 grams. If you are making 500 grams, it ends up being 175 grams. If you are making 1000 grams, its 350 grams. It takes less math work IMO.