Vegetables
Onion: calories and nutrition
Onion has 40 calories per 100 g. 1 slice of onion (14 g) has 5.6 calories, 0.2 g of protein, 1.3 g of carbohydrates and 0 g of fat.
Calories
Protein g
Carbs g
Fat g
Protein 10% of caloriesCarbohydrates 88%Fat 2%
At a glance
- Very light: 40 calories per 100 g, so you can eat a big portion for few calories.
- Mostly carbohydrate with little fat: the kind of food athletes often pick for energy before or after a game.
Nutrition facts
| Nutrient | Per 100 g | Your portion |
|---|---|---|
| Calories | 40 | |
| Protein | 1.1 g | g |
| Carbohydrates | 9.3 g | g |
| Fiber | 1.7 g | g |
| Sugars | 4.2 g | g |
| Fat | 0.1 g | g |
| Saturated fat | 0 g | g |
| Sodium | 4 mg | mg |
| Potassium | 146 mg | mg |
| Calcium | 23 mg | mg |
| Iron | 0.2 mg | mg |
| Vitamin C | 7.4 mg | mg |
| Cholesterol | 0 mg | mg |
Source: USDA FoodData Central, SR Legacy, "Onions, raw" (FDC ID 170000). Values are averages and vary by variety, brand and preparation.
Questions
How many calories are in 1 slice of onion?
5.6 calories (14 g). Per 100 g, onion has 40 calories.
How much protein is in onion?
1.1 g per 100 g, or 0.2 g in 1 slice of onion.
How many carbs are in onion?
9.3 g of carbohydrates per 100 g, including 1.7 g of fiber and 4.2 g of sugars.
Similar foods
Butternut squash: 40 kcalCarrots: 41 kcalBrussels sprouts: 43 kcalBeets: 43 kcalKale: 35 kcalBroccoli (cooked): 35 kcalBroccoli: 34 kcalGreen onions: 32 kcal
How many calories do I need? · How much protein do I need?
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