Cooked onion: calories and nutrition facts
Cooked onion has 35 kcal per 100 g. One serving, 1 Serving (100 g), has 35 kcal.
- Calories
- 35 kcal
- Protein
- 1.3 g
- Carbohydrates
- 6.2 g
- Fat
- 0.2 g
Per 100 g
Cooked onion: how many calories?
Cooked onion has 35 kcal per 100 g, with 1.3 g protein, 6.2 g carbs and 0.2 g fat. A 100 g serving (1 Serving) has 35 kcal. That is less than the average for Fruits & Veggies (109 kcal per 100 g). Most of its calories come from carbohydrates.
Where the calories come from
- Protein16%
- Carbohydrates78%
- Fat6%
Calculate a portion
- Calories
- 35 kcal
- Protein
- 1.3 g
- Carbohydrates
- 6.2 g
- Fat
- 0.2 g
Nutrition facts
| Nutrient | Per 100 g | Per serving (100 g) |
|---|---|---|
| Calories | 35 kcal | 35 kcal |
| Fat | 0.2 g | 0.2 g |
| of which saturated fat | 0 g | 0 g |
| Carbohydrates | 6.2 g | 6.2 g |
| of which sugars | 4 g | 4 g |
| Fiber | 1.4 g | 1.4 g |
| Protein | 1.3 g | 1.3 g |
| Sodium | 8 mg | 8 mg |
| Water | 90.4 g | 90.4 g |
| Vitamin C | 2.1 mg | 2.1 mg |
| Calcium | 29 mg | 29 mg |
| Iron | 0.2 mg | 0.2 mg |
| Potassium | 220 mg | 220 mg |
| Magnesium | 13 mg | 13 mg |
Source: Ciqual food composition table (ANSES, France). Data updated on 2 September 2026.
Share of reference intakes
Per 100 g, compared with an adult's reference intakes (2,000 kcal a day, Regulation (EU) No 1169/2011).
| Nutrient | Of reference intake |
|---|---|
| Calories(35 kcal) | 2% |
| Fat(0.2 g) | 0% |
| of which saturated fat(0 g) | 0% |
| Carbohydrates(6.2 g) | 2% |
| of which sugars(4 g) | 4% |
| Protein(1.3 g) | 3% |
| Salt(0.02 g) | 0% |
What the EU thresholds say
Nutrition claim thresholds from Regulation (EC) No 1924/2006, per 100 g.
- Low energy (40 kcal or less)
- Source of protein (at least 12% of calories)
- Low fat (3 g or less)
- Low sugars (5 g or less)
- Low sodium (120 mg or less)
Cooked onion: frequently asked questions
Cooked onion: how many calories per serving?
A 100 g serving (1 Serving) has 35 kcal.
Cooked onion: how much protein?
Cooked onion contains 1.3 g of protein per 100 g, 3% of the 50 g reference intake.
Cooked onion: how much fibre?
Cooked onion provides 1.4 g of fibre per 100 g, 6% of the 25 g a day recommended by EFSA.
Cooked onion: how much makes 100 kcal?
100 kcal is about 289 g of this food.
More foods in this category
- Cooked leek25 kcal
- Cooked legume113 kcal
- Cooked lentils125 kcal
- Cooked mung beans96 kcal
- Cooked New Zealand spinach14 kcal
- Cooked okra22 kcal
- Cooked parsnip91 kcal
- Cooked peas81 kcal
- Cooked pigeon peas0 kcal
- Cooked plantain125 kcal
- Cooked prune0 kcal
- Cooked pumpkin26 kcal
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