Cups measure volume, pounds measure weight. The conversion depends entirely on the ingredient density, which is why a cup of flour and a cup of honey weigh very different amounts.
For baking, measuring by weight (grams or pounds) is more accurate than measuring by cups, because scoop technique can change how much flour fits in a cup by up to 20%.
Spoon flour lightly into the cup and level it off to avoid packing, which would add 20-30% extra and make baked goods dense.
Next stepFor precision baking, place your bowl on a digital kitchen scale and weigh directly in grams to eliminate volume ambiguity entirely.