Onion: calories and nutrition facts
Onion has 39 kcal per 100 g. One serving, 1 Onion (150 g), has 59 kcal.
- Calories
- 39 kcal
- Protein
- 1.1 g
- Carbohydrates
- 6.3 g
- Fat
- 0.6 g
Per 100 g
Onion: how many calories?
Onion has 39 kcal per 100 g, with 1.1 g protein, 6.3 g carbs and 0.6 g fat. A 150 g serving (1 Onion) has 59 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
- Protein13%
- Carbohydrates71%
- Fat16%
Calculate a portion
- Calories
- 59 kcal
- Protein
- 1.7 g
- Carbohydrates
- 9.4 g
- Fat
- 0.9 g
Nutrition facts
| Nutrient | Per 100 g | Per serving (150 g) |
|---|---|---|
| Calories | 39 kcal | 59 kcal |
| Fat | 0.6 g | 0.9 g |
| of which saturated fat | 0.2 g | 0.3 g |
| Carbohydrates | 6.3 g | 9.4 g |
| of which sugars | 4.8 g | 7.2 g |
| Fiber | 1.7 g | 2.6 g |
| Protein | 1.1 g | 1.7 g |
| Sodium | 39 mg | 59 mg |
| Water | 89.6 g | 134.4 g |
| Vitamin C | 3.9 mg | 5.9 mg |
| Calcium | 25 mg | 38 mg |
| Iron | 0 mg | 0 mg |
| Potassium | 190 mg | 285 mg |
| Magnesium | 9 mg | 14 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(39 kcal) | 2% |
| Fat(0.6 g) | 1% |
| of which saturated fat(0.2 g) | 1% |
| Carbohydrates(6.3 g) | 2% |
| of which sugars(4.8 g) | 5% |
| Protein(1.1 g) | 2% |
| Salt(0.1 g) | 2% |
What the EU thresholds say
Nutrition claim thresholds from Regulation (EC) No 1924/2006, per 100 g.
- Low energy (40 kcal or less)
- Low fat (3 g or less)
- Low sugars (5 g or less)
- Low sodium (120 mg or less)
Onion: frequently asked questions
Onion: how many calories per serving?
A 150 g serving (1 Onion) has 59 kcal.
Onion: how much protein?
Onion contains 1.1 g of protein per 100 g, 2% of the 50 g reference intake.
Onion: how much fibre?
Onion provides 1.7 g of fibre per 100 g, 7% of the 25 g a day recommended by EFSA.
Onion: how much makes 100 kcal?
100 kcal is about 256 g of this food.
Recipes with this food
More foods in this category
- Mushroom24 kcal
- Napa cabbage16 kcal
- Nectarine50 kcal
- New potato76 kcal
- Oak leaf lettuce11 kcal
- Okra31 kcal
- Oven-baked potato fries213 kcal
- Oyster mushroom27 kcal
- Pan-fried button mushroom38 kcal
- Pan-fried potatoes137 kcal
- Papaya40 kcal
- Parsnip68 kcal
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