How many calories in
sweet onion?
Sweet Onion comes in at 32 calories per 100g. A more substantial veg by calorie content.
Common serving sizes.
Calories scale with portion. Here's how a typical sweet onion serving translates in your tracker:
What 32 calories means.
Very low calorie — at 32 kcal per 100g, sweet onion adds volume to a meal without meaningfully denting a calorie deficit.
Sweet Onion vs. similar foods.
How sweet onion stacks up on calories and protein against foods people commonly compare it to:
Skip the lookup. Snap the plate.
Point your iPhone camera at sweet onion and Spotwell's AI estimates the portion and macros in a few seconds. Check it, adjust anything that looks off, and log it.
Download on theApp StoreQuick answers.
How many calories in sweet onion?
Sweet Onion has approximately 32 calories per 100g. A typical serving — 3 oz (85g) — comes in at 27 calories.
How much protein is in sweet onion?
0.8g of protein per 100g. That puts sweet onion at roughly 2.5g of protein per 100 calories — a useful lens when comparing to other vegetables sources.
How do I log sweet onion accurately?
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 a few seconds. Adjust the value if it looks off.
Is sweet onion good for weight loss?
It depends on your overall calorie target. Sweet Onion is naturally low-calorie at 32 kcal per 100g, so it's easy to fit into a deficit.