White button mushrooms are 22 calories per 100g. Portobellos and creminis are similar. Mushrooms shrink dramatically when cooked (water loss), so 1 cup raw becomes about 1/2 cup cooked — but the calorie count of the same starting weight stays the same.
Calories scale with portion. Here's how a typical mushrooms serving translates in your tracker:
Very low calorie — at 22 kcal per 100g (white button), mushrooms adds volume to a meal without meaningfully denting a calorie deficit.
How mushrooms stacks up on calories and protein against foods people commonly compare it to:
Point your iPhone camera at mushrooms and Spotwell's on-device AI estimates the portion and macros in under a second — no manual entry, no barcode hunting.
Download on theApp StoreMushrooms has approximately 22 calories per 100g (white button). A typical serving — 1 cup, sliced (70g) — comes in at 15 calories.
3.1g of protein per 100g (white button). That puts mushrooms at roughly 14.1g of protein per 100 calories — a useful lens when comparing to other vegetables 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. Mushrooms is naturally low-calorie at 22 kcal per 100g (white button), so it's easy to fit into a deficit.