# Onions, raw: calories and nutrition
Canonical: https://nutritionizm.com/food/onions-raw/
Last verified: 2026-10-26
Source: USDA FoodData Central (ID: 170000)
License: USDA FoodData Central values are public domain (CC0 1.0); Nutritionizm compilation and plain-language text are licensed under CC BY 4.0 (attribution: link to Canonical URL).

Per 100 g, raw onions provide 40 kcal, 1.1 g protein, 0.1 g total fat, 9.34 g carbohydrates, 1.7 g fiber, 4.24 g sugars, 7.4 mg vitamin C, and 146 mg potassium.

## Nutrient profile (per 100 g)

| Nutrient | Per 100 g | % Daily Value |
| --- | --- | --- |
| Calories | 40 kcal | 2% |
| Total Fat | 0.1 g | 0% |
| Saturated Fat | 0 g | 0% |
| Total Carbohydrate | 9.3 g | 3% |
| Sugars | 4.2 g | 8% |
| Dietary Fiber | 1.7 g | 6% |
| Protein | 1.1 g | 2% |
| Sodium | 4 mg | 0% |
| Calcium | 23 mg | 2% |
| Folate | 19 µg | 5% |
| Iron | 0.2 mg | 1% |
| Magnesium | 10 mg | 2% |
| Potassium | 146 mg | 3% |
| Vitamin A | 0 µg | 0% |
| Vitamin B12 | 0 µg | 0% |
| Vitamin C | 7.4 mg | 8% |
| Vitamin D | 0 µg | 0% |
| Zinc | 0.2 mg | 2% |

## Standard servings

- 1 cup, chopped: 160 g
- 1 cup, sliced: 115 g
- 1 tbsp chopped: 10 g
- 1 large: 150 g
- 1 slice, large (1/4" thick): 38 g
- 1 medium (2-1/2" dia): 110 g
- 1 slice, medium (1/8" thick): 14 g
- 1 small: 70 g
- 1 slice, thin: 9 g
- 10 rings: 60 g

## What is in it
Per 100 g, raw onions provide 40 kcal of energy. It contains 1.1 g protein, 0.1 g total fat, and 9.34 g carbohydrates. This includes 1.7 g dietary fiber and 4.24 g total sugars. It also has 7.4 mg vitamin C, 146 mg potassium, 23 mg calcium, 10 mg magnesium, and 4 mg sodium. Smaller amounts include iron, zinc, and folate.

## What it means for your health
Dietary fiber is a type of carbohydrate found in plant foods. Vitamin C and potassium are nutrients found in many foods. These amounts show what this food contains per 100 g. It may fit into a varied pattern of eating.

## Good to know
One cup, chopped is 160 g. One medium is 110 g. One large slice is 38 g. This food has 0.1 g total fat per 100 g. It has 4 mg sodium per 100 g. This is general education, not medical advice.