Calories in Onions, red, raw
Generic food Raw Vegetables
Onions, red, raw contains 44 kcal per 100 g. A typical serving of 1 Onion, Edible (197 g) provides about 87 kcal.
Roughly 89% of its calories come from carbohydrates, with 8% from protein and 2% from fat (estimated with general energy factors).
That is more energy than the typical item in vegetables and vegetable products on FoodFactly, where the median is 35 kcal per 100 g across 866 foods.
These values are for the raw food. Cooking changes the water content and some nutrients, so cooked versions are listed separately below.
The data comes from USDA FoodData Central: Foundation Foods, where most core values were measured by laboratory analysis.
Nutrition facts
| Nutrient | Amount per 100 g | % DV |
|---|---|---|
| Calories C | 44 kcal | |
| Total fat M | 0.1 g | 0.1% |
| Saturated fat | not reported | |
| Sodium M | 1 mg | 0% |
| Total carbohydrates M | 9.9 g | 4% |
| Dietary fiber M | 2.2 g | 8% |
| Total sugars M | 5.8 g | |
| Protein M | 0.94 g | 2% |
| Vitamin C M | 8.1 mg | 9% |
| Biotin (B7) M | 0 µg | 0% |
| Calcium M | 17 mg | 1% |
| Iron M | 0.24 mg | 1% |
| Magnesium M | 11.4 mg | 3% |
| Phosphorus M | 41 mg | 3% |
| Potassium M | 197 mg | 4% |
| Zinc M | 0.17 mg | 2% |
| Copper M | 0.058 mg | 6% |
| Manganese M | 0.12 mg | 5% |
| Selenium M | 0.5 µg | 0.9% |
| Iodine M | 0 µg | 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 8%
- Carbohydrates 89%
- Fat 2%
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
- Protein0.94 gin the lowest quarter of vegetables and vegetable products (median 2 g)
- Sugars5.8 gin the top quarter of vegetables and vegetable products (median 2.3 g)
- Fat0.1 gin the lowest quarter of vegetables and vegetable products (median 0.3 g)
- Sodium1 mgin the lowest quarter of vegetables and vegetable products (median 36 mg)
- Protein per 100 kcal2.1 gprotein density, useful for comparing foods with different calorie levels
- Water88.6 gwater per 100 g, which largely explains differences between raw, cooked and dried forms
Full nutrient profile
Sugars and starch (5)
| Sucrose M | 1.7 g |
|---|---|
| Glucose M | 2.3 g |
| Fructose M | 1.8 g |
| Lactose M | 0 g |
| Maltose M | 0 g |
Other components (3)
| Water M | 88.6 g |
|---|---|
| Ash M | 0.43 g |
| Energy C | 186 kJ |
Other forms of Onions
Raw, cooked, dried and processed versions are separate records with their own measured values.
| Food | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Onion, raw Raw | 40 | 1.1 g | 9.3 g | 0.1 g |
| Onions, cooked, boiled, drained, without salt Cooked | 44 | 1.4 g | 10.2 g | 0.19 g |
| Onions, dehydrated flakes Dried or dry | 349 | 9 g | 83.3 g | 0.46 g |
| Onions, canned, solids and liquids Canned | 19 | 0.85 g | 4 g | 0.09 g |
| Onions, yellow, sauteed Cooked | 123 | 0.95 g | 7.9 g | 10.8 g |
| Onions, spring or scallions (includes tops and bulb), raw Raw | 32 | 1.8 g | 7.3 g | 0.19 g |
| Onions, young green, tops only | 27 | 0.97 g | 5.7 g | 0.47 g |
| Onions, welsh, raw Raw | 34 | 1.9 g | 6.5 g | 0.4 g |
| Onions, sweet, raw Raw | 32 | 0.8 g | 7.6 g | 0.08 g |
| Onions, cooked, boiled, drained, with salt Cooked | 42 | 1.4 g | 9.6 g | 0.19 g |
| Onions, frozen, chopped, cooked, boiled, drained, with salt Cooked | 26 | 0.77 g | 6 g | 0.1 g |
| Onions, frozen, chopped, unprepared Frozen | 29 | 0.79 g | 6.8 g | 0.1 g |
Per 100 g. Calories in kcal. n/a: not reported by the source.
Foods with a similar nutritional profile
| Food | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Carrots, raw Raw | 41 | 0.93 g | 9.6 g | 0.24 g |
| Beets, raw Raw | 43 | 1.6 g | 9.6 g | 0.17 g |
| Red bell pepper, raw Raw | 26 | 0.99 g | 6 g | 0.3 g |
| Rutabagas, raw Raw | 37 | 1.1 g | 8.6 g | 0.16 g |
| Green beans, raw Raw | 31 | 1.8 g | 7 g | 0.22 g |
| Peppers, hot chili, red, raw Raw | 40 | 1.9 g | 8.8 g | 0.44 g |
| Peppers, hot chili, green, raw Raw | 40 | 2 g | 9.5 g | 0.2 g |
| Carrots, baby, raw Raw | 35 | 0.64 g | 8.2 g | 0.13 g |
Per 100 g. Calories in kcal. n/a: not reported by the source.
Frequently asked questions
How many calories are in raw onions?
100 g of raw onions has 44 kcal. 1 Onion, Edible (197 g): about 87 kcal.
How much protein is in raw onions?
Raw onions contains 0.94 g of protein per 100 g (2% of the 50 g Daily Value), or 1.9 g in 1 Onion, Edible (197 g). About 8% of its calories come from protein. Compared with other vegetables and vegetable products, that is in the lowest quarter (median 2 g).
How many carbs are in raw onions?
Raw onions has 9.9 g of total carbohydrates per 100 g, including 2.2 g of fiber and 5.8 g of sugars.
How much fat is in raw onions?
Raw onions contains 0.1 g of fat per 100 g.
How much sodium is in raw onions?
100 g contains 1 mg of sodium, 0% of the 2,300 mg Daily Value.
Does onions have the same nutrition raw and cooked?
No. Per 100 g, onions, red, raw has 44 kcal, while onions, cooked, boiled, drained, without salt has 44 kcal. Cooking changes the water content, so always use the record that matches how you weigh the food.
Where does this nutrition data come from?
From USDA FoodData Central: Foundation Foods, record dated April 1, 2020. 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: Foundation Foods, record 790577. License: CC0 1.0 (U.S. public domain). Source record dated April 1, 2020. 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.