Costco sells Kirkland Signature semi‑sweet chocolate chips in bulk packages that list a standard serving—typically ¼ cup (about 30 g). The nutrition label on that package reports roughly 150 calories per serving, along with the total weight of the bag, which allows a simple conversion to calories per gram. Because the label is regulated by the U.S. Food and Drug Administration, those numbers are reliable for the specific batch they accompany, provided the product formulation remains unchanged.
The calorie figure reflects the energy supplied by the carbohydrate, fat, and protein components of the chips, calculated using the Atwater factors (4 kcal / g for carbs and protein, 9 kcal / g for fat). This method is consistent across most packaged foods, meaning the reported 150 calories per ¼ cup can be traced back to the chip’s ingredient composition. Understanding this baseline is the first step toward any meaningful nutritional analysis.