Red Onion
Red Onion contains 30 kcal per 100 g. A serving, 1 medium onion, 148 g (148 g) provides about 44 kcal.
Roughly 91% of its calories come from carbohydrates, with 9% from protein and 0% from fat (estimated with general energy factors).
That is less energy than the typical item in fruits on FoodFactly, where the median is 40 kcal per 100 g across 1,600 products.
The values are label data submitted by the manufacturer to USDA FoodData Central.
Nutrition facts
| Nutrient | Amount per 100 g | % DV |
|---|---|---|
| Calories L | 30 kcal | |
| Total fat L | 0 g | 0% |
| Saturated fat L | 0 g | 0% |
| Trans fat L | 0 g | |
| Cholesterol L | 0 mg | 0% |
| Sodium L | 0 mg | 0% |
| Total carbohydrates L | 6.8 g | 2% |
| Dietary fiber L | 1.4 g | 5% |
| Total sugars L | 3.4 g | |
| Protein L | 0.68 g | 1% |
| Vitamin A L | 0 µg | 0% |
| Vitamin C L | 4.1 mg | 5% |
| Calcium L | 14 mg | 1% |
| Iron L | 0 mg | 0% |
% DV: percent of the FDA Daily Value for adults (reference amounts). Letters show how each value was obtained: M measured, C calculated, L label, Z assumed zero, I imputed. Vitamins and minerals not listed were not reported by the source.
Nutritional breakdown
- Protein 9%
- Carbohydrates 91%
Approximate share of calories, using general energy factors (4 kcal/g protein and carbohydrate, 9 kcal/g fat, 7 kcal/g alcohol).
Vitamins and minerals, % Daily Value per 100 g
Nutritional insights
- Protein0.68 gin the lowest quarter of fruits (median 1.8 g)
- Fiber1.4 gin the lowest quarter of fruits (median 2.1 g)
- Sugars3.4 gabove the median for fruits (median 2.4 g)
- Sodium0 mgin the lowest quarter of fruits (median 29 mg)
- Protein per 100 kcal2.3 gprotein density, useful for comparing foods with different calorie levels
Full nutrient profile
Other components (1)
| Vitamin A, IU L | 0 IU |
|---|
Values by source
More than one dataset describes this food. FoodFactly keeps each source's values separately instead of blending them. The headline values above come from USDA FoodData Central: Branded Foods.
| Per 100 g | Open Food Facts | USDA Branded |
|---|---|---|
| Calories | 30 kcal | 30 kcal |
| Protein | 0.68 g | 0.68 g |
| Carbohydrates | 6.8 g | 6.8 g |
| Fat | 0 g | 0 g |
| Fiber | 1.4 g | 1.4 g |
| Sugars | 3.4 g | 3.4 g |
| Sodium | 0 mg | 0 mg |
Product details
- Brand
- Ahold
- Barcode
- 0688267170010
- Label serving
- 1 MEDIUM ONION (148 g)
- Category
- Fruits and vegetables based foods
- Nutri-Score
- A as computed by Open Food Facts
- NOVA group
- 1 processing level (1 to 4), as classified by Open Food Facts
Ingredients
Onion
As listed on the package and transcribed by Open Food Facts contributors. Always check the package for allergens.
Ingredient guides: Onion
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|---|---|---|---|---|
| Fresh Red Onions Wellsley Farms | 30 | 0.68 g | 7.4 g | 0 g |
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| Fresh Yellow Onion Wellsley Farms | 30 | 0.68 g | 7.4 g | 0 g |
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Per 100 g. Calories in kcal. n/a: not reported by the source.
Frequently asked questions
How many calories are in Red Onion?
100 g of Red Onion has 30 kcal. Serving, 1 medium onion, 148 g (148 g): about 44 kcal.
How much protein is in Red Onion?
Red Onion contains 0.68 g of protein per 100 g (1% of the 50 g Daily Value), or 1 g in serving, 1 medium onion, 148 g (148 g). About 9% of its calories come from protein. Compared with other fruits, that is in the lowest quarter (median 1.8 g).
How many carbs are in Red Onion?
Red Onion has 6.8 g of total carbohydrates per 100 g, including 1.4 g of fiber and 3.4 g of sugars.
How much fat is in Red Onion?
Red Onion contains 0 g of fat per 100 g, of which 0 g is saturated (0% of the Daily Value).
How much sodium is in Red Onion?
100 g contains 0 mg of sodium, 0% of the 2,300 mg Daily Value.
Where does this nutrition data come from?
From USDA FoodData Central: Branded Foods, record dated March 1, 2025. FoodFactly last checked it on November 6, 2026. Each value above shows whether it was measured, calculated or taken from a label.
Source of the nutrition information
- USDA FoodData Central: Branded Foods, record 1581588. License: CC0 1.0 (U.S. public domain). Source record dated July 14, 2017. Imported November 6, 2026.
- Open Food Facts, record 0688267170010. License: ODbL 1.0 (Open Food Facts). Source record dated March 1, 2025. Imported November 6, 2026.
Last updated: . Data quality score: 95/100 (how it is calculated).
General nutrition information, not medical advice. Individual needs differ; see our disclaimer.