How many calories are in an onion?
Onion: 40 kcal per 100 g.
- 1 slice (14 g)6 kcal
- 1 small (70 g)28 kcal
- 1 medium (110 g)44 kcal
- 1 large (150 g)60 kcal
Weights are for the part you eat.
| 100 g | 1 medium (110 g) | |
|---|---|---|
| Calories | 40 kcal | 44 kcal |
| Protein | 1.1 g | 1.2 g |
| Carbs | 9.3 g | 10.3 g |
| of which sugars | 4.2 g | 4.7 g |
| Fiber | 1.7 g | 1.9 g |
| Fat | 0.1 g | 0.1 g |
| Salt | 0.01 g | 0.01 g |
2.2% of a 2,000 kcal day
Find your own daily caloriesTime to burn this portion (70 kg body weight)
- Walking10 min
- Cycling5 min
- Running4 min

Where the calories come from
- Protein 10%
- Carbs 88%
- Fat 2%
Similar foods
Eating more than one thing? Snap the whole plate.
Cal Clark counts the calories and macros of the whole meal from one photo.
Source: USDA FoodData Central. Activity values: Compendium of Physical Activities (2011).





