Onions, raw
Last updated 4 Nov 2026
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Onions are bulb vegetables, and the figures here describe them raw. They contain mostly water and provide carbohydrate, with some fibre and small amounts of protein and fat. Per 100g, raw onions contain 8g of carbohydrate, including 6.2g of sugars, alongside 2.2g of fibre and 0.1g of fat.
Fibre helps support normal bowel function, while carbohydrate provides energy for the body. The sugars in raw onions occur naturally within the vegetable rather than being added. Raw onions contain very little salt, although salt and fat added during cooking can change the nutritional content of a dish. Full nutritional figures are shown in the tables below.
Nutrition per 100g
Nutrient | Per 100g |
|---|---|
Energy | 35 kcal |
Energy | 150 kJ |
Fat | 0.1g |
of which saturates | Trace |
Carbohydrate | 8g |
of which sugars | 6.2g |
2.2g | |
1g | |
Salt | 0.01g |
Alcohol | 0g |
Water | 89g |
Cholesterol | 0mg |
Vitamins and minerals per 100g
Nutrient | Per 100g |
|---|---|
2µg | |
0µg | |
0.29mg | |
3mg | |
0.11mg | |
0.02mg | |
0.3mg | |
0.1mg | |
0µg | |
11µg | |
30mg | |
0.3mg | |
8mg | |
23mg | |
138mg | |
Sodium | 3mg |
0.1mg | |
0.04mg | |
Trace | |
2µg |
Other types of onions
Food | Calories per 100g | Protein per 100g | Fat per 100g | Fibre per 100g |
|---|---|---|---|---|
309 kcal | 8.8g | 1.2g | 19g | |
43 kcal | 1.2g | 0.2g | 2.7g | |
25 kcal | 0.7g | 0.3g | 2.3g | |
95 kcal | 1.2g | 5.3g | 3g | |
95 kcal | 1.2g | 5.3g | 3g | |
95 kcal | 1.2g | 5.3g | 3g | |
95 kcal | 1.2g | 5.3g | 3g | |
24 kcal | 0.9g | 0.2g | 1.6g | |
95 kcal | 1.2g | 5.3g | 3g | |
15 kcal | 0.6g | 0.1g | – |
About these figures
Values are per 100g of the food as described (22 samples, autumn and winter, UK grown and imported, pre-packed and loose). "Trace" means only a very small amount was found. Nutrients that were not measured are not shown. Salt is calculated from sodium.