Air-popped popcorn is one of the lightest snacks per volume — about 31 calories per cup popped. The 100g number looks high because popcorn is mostly air; you'd need a stadium tub to eat that much. Movie-theater popcorn is a different food entirely thanks to oil and butter, often hitting 1,200+ calories for a large.
Calories scale with portion. Here's how a typical popcorn serving translates in your tracker:
Carb-forward — most of its 387 kcal come from carbohydrate, so it's best placed around training when your body uses carbs most readily.
Point your iPhone camera at popcorn and Spotwell's on-device AI estimates the portion and macros in under a second — no manual entry, no barcode hunting.
Download on theApp StorePopcorn has approximately 387 calories per 100g (air-popped). A typical serving — 1 cup, air-popped (8g) — comes in at 31 calories.
13g of protein per 100g (air-popped). That puts popcorn at roughly 3.4g of protein per 100 calories — a useful lens when comparing to other snacks sources.
The simplest method: weigh it on a kitchen scale, then enter grams in your tracker. With Spotwell, you can skip the scale — point the camera at the plate and the AI estimates the portion in under a second. Adjust the value if it looks off.
It depends on your overall calorie target. Popcorn sits in a moderate calorie range. It can fit any goal — weight loss, maintenance, or muscle gain — when portioned to your daily target.