Onion has about 43 kcal per 100 g — 1.1 g protein, 9.3 g carbs and 0.1 g fat. Below is the full breakdown per 100 g and per typical serving, plus answers to common questions.
| Nutrient | Per 100 g | Per serving (1/2 onion (70 g)) |
|---|---|---|
| Calories | 43 kcal | 30 kcal |
| Protein | 1.1 g | 0.8 g |
| Carbs | 9.3 g | 6.5 g |
| Fat | 0.1 g | 0.1 g |
Values from the USDA FoodData Central database.
Onion contains about 43 kcal per 100 g. A typical serving (1/2 onion (70 g)) is roughly 30 kcal.
Per 100 g, Onion provides 1.1 g of protein, 9.3 g of carbohydrates and 0.1 g of fat.
Yes — like any food, Onion fits a healthy, goal-based diet when portioned to your daily calories and macros. Use the figures above to match it to your plan.