Like most people in the United States, I grew up seeing recipes written in terms of ounces, pounds, cups, and so on. This doesn’t work as well for breads, so I list metric measurements first before the conventional cups, spoons, and ounces. I find that weights, whether metric or conventional, are more accurate. The fact is, 1 cup of flour will vary in weight depending on many factors: how aerated the flour is, how you scoop it, whether and how you level it, and more. On the other hand, 100 grams of flour is always 100 grams of flour, so using a scale is much more reliable.