Food weight and portion guide
Onion: calories and portions
Onions, raw
These values are for raw onion. Fried onion also contains absorbed oil and has lost water.
Calculate your portion
Enter 0.1–5,000 g. Exclude inedible skin, stones and bones.
for 100 g:
- Calories
- 40 kcal
- Protein
- 1.1 g
- Carbohydrate
- 9.3 g
- Fat
- 0.1 g
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Nutrition by weight
| Weight | Calories | Protein | Carbohydrate | Fat |
|---|---|---|---|---|
| 100 g | 40 | 1.1 g | 9.3 g | 0.1 g |
| 200 g | 80 | 2.2 g | 18.7 g | 0.2 g |
Values are scaled from the per-100-g data and rounded. “Calories” means kilocalories (kcal).
Tips for weighing and logging
For fried onions, account for both the onion and the cooking oil in the recipe.
To calculate manually, multiply your portion weight in grams by 40 and divide by 100. For example, 100 g provides approximately 40 kcal.
When logging a photo, check the food, cooking method and estimated portion before saving. A photograph cannot reliably show hidden oil or exact weight.
Sources and calculation method
The record below provides values per 100 g of edible food. One reference variety or brand does not represent every product.Library method and limitations
- USDA FoodData Central — SR Legacy — Onions, raw · FDC ID: 170000 · SR Legacy Collection, April 2018
Data review and calculation: October 2, 2026. Author: Avocado editorial team. This guide supports food logging; it does not replace personalised advice from a registered dietitian.