Eli5 calories calculation?

Question

Hello! Why is my popcorn has 90 calories for 1 cup, but 260 for 3? Where are the 10 calories missing? Thank you 🙂

In: 1

Answer 1

Food labels have rounding rules in place. This allows for natural variability in the content of the food. Up to 50 calories rounds to the nearest 5, over 50 rounds to the nearest 10. So each cup of popcorn may actually be more like 85 calories instead of 90. So for 3 cups, the actual amount would be 255 calories, which rounds to 260.