Yellow Onion comes in at 40 calories per 100g. A more substantial veg by calorie content.
Calories scale with portion. Here's how a typical yellow onion serving translates in your tracker:
Point your iPhone camera at yellow onion and SpotWell's on-device AI estimates the portion and macros in under a second — no manual entry, no barcode hunting.
Download on theApp StoreYellow Onion has approximately 40 calories per 100g. A typical serving — 3 oz (85g) — comes in at 34 calories.
1.1g of protein per 100g. That puts yellow onion at roughly 2.8g 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. Yellow Onion is naturally low-calorie at 40 kcal per 100g, so it's easy to fit into a deficit.