Onions, boiled in unsalted water
Dernière mise à jour 4 Nov 2026
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Onions are a bulb vegetable, described here after boiling in unsalted water. They provide mainly water, with carbohydrate and fibre, and small amounts of protein and fat. Per 100g, these boiled onions contain 5.4g of carbohydrate, including 4.2g of sugars, and 2.3g of fibre. Their salt content is 0.01g per 100g.
Fibre helps support normal bowel function. The sugars in plain boiled onions occur naturally, rather than being added during cooking. Boiling without salt keeps the salt content low; adding salt, stock or sauces can change this. Butter or oil added before serving will also increase the fat and energy content. Full nutrient figures are shown in the tables below.
Nutrition per 100g
Nutrient | Per 100g |
|---|---|
Energy | 25 kcal |
Energy | 108 kJ |
Graisse | 0.3g |
of which saturates | Trace |
Carbohydrate | 5.4g |
of which sugars | 4.2g |
2.3g | |
0.7g | |
Sel | 0.01g |
Eau | 93g |
Cholestérol | 0mg |
Vitamins and minerals per 100g
Nutrient | Per 100g |
|---|---|
1µg | |
0µg | |
0.31mg | |
4mg | |
0.03mg | |
Trace | |
0.3mg | |
0.07mg | |
0µg | |
8µg | |
25mg | |
0.29mg | |
7mg | |
23mg | |
105mg | |
Sodium | 2mg |
0.2mg | |
0.05mg | |
Trace | |
2µg |
Other types of onions
Food | Calories per 100g | Protein per 100g | Fat per 100g | Fibre per 100g |
|---|---|---|---|---|
43 kcal | 1.2g | 0.2g | 2.7g | |
309 kcal | 8.8g | 1.2g | 19g | |
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 | |
35 kcal | 1g | 0.1g | 2.2g | |
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.