Calories in Onion
44kcal per 1 medium onion (110 g)
40 kcal per 100 g · about 2% of a 2,000-kcal day
Onions add flavor to nearly any dish for around 44 calories per whole onion — the oil they are cooked in is what adds up.
Onion nutrition facts
| Nutrient | Per 100 g | Per 1 medium onion |
|---|---|---|
| Calories | 40 kcal | 44 kcal |
| Protein | 1.1 g | 1.2 g |
| Carbs | 9.3 g | 10.2 g |
| Fat | 0.1 g | 0.1 g |
| Fiber | 1.7 g | 1.9 g |
| Sugar | 4.2 g | 4.6 g |
Where the calories come from
Protein 10% Carbs 88% Fat 2%
Onion calories by serving size
| Serving | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| 1 oz (28 g) | 11 kcal | 0.3 g | 2.6 g | 0 g |
| 50 g | 20 kcal | 0.6 g | 4.7 g | 0.1 g |
| 100 g | 40 kcal | 1.1 g | 9.3 g | 0.1 g |
| 1 medium onion (110 g) | 44 kcal | 1.2 g | 10.2 g | 0.1 g |
| 200 g | 80 kcal | 2.2 g | 18.6 g | 0.2 g |
| 250 g | 100 kcal | 2.8 g | 23.3 g | 0.3 g |
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