White Onions Calories and Nutrition Facts
White Onions has 35 calories per 100 g, with 0.9 g protein, 7.7 g carbs and 0.1 g fat. Official USDA analytical record: Onions, white, raw (FDC ID: 1104962).
A 100g serving of white onions contains 35 calories, 0.9g protein, 7.7g total carbs (6.5g net carbs), and 0.1g fat.
Energy density
0.35 kcal/g
very low
Protein / 100 kcal
2.6 g
satiety per calorie
Net carbs / 100 g
6.5 g
carbs minus fibre
100 kcal portion
286 g
≈ 10.1 oz
- Sugars
- 5.8g
- Fibre
- 1.2g
- Saturated fat
- 0g
- Sodium
- 2mg
Onions, white, raw nutrition facts
The table below shows the complete nutritional profile for onions, white, raw per 100 g (the laboratory analytical standard), alongside the share of the FDA Daily Value each nutrient covers. Most of its calories come from carbohydrate, and it is relatively low in calories.
| Nutrient | Per 100 g | % DV* |
|---|---|---|
| Calories | 35 kcal | — |
| Protein | 0.9 g | 2% |
| Carbohydrate | 7.7 g | 3% |
| Fat | 0.1 g | 0% |
| Sugars | 5.8 g | — |
| Fibre | 1.2 g | 4% |
| Saturated fat | 0 g | 0% |
| Sodium | 2 mg | 0% |
*Percent Daily Value per 100 g, against the FDA reference intakes for adults and children 4+ years (50 g protein, 275 g carbohydrate, 28 g fibre, 78 g fat, 20 g saturated fat, 2300 mg sodium). Total sugars has no Daily Value — the 50 g reference applies to added sugars only, and USDA reports total sugars here.
White Onions calories by weight: ounces, pounds and grams
USDA publishes this food per 100 g, so here is the same profile converted to the weights a kitchen scale and a US recipe actually use. At 0.35 kcal per gram (very low energy density), you can eat a large volume of this for very few calories, which makes it useful for filling out a meal in a deficit.
| Amount | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| 1 oz (28 g) | 10 kcal | 0.3 g | 2.2 g | 0 g |
| 100 g (3.5 oz) | 35 kcal | 0.9 g | 7.7 g | 0.1 g |
| 4 oz (113 g) | 40 kcal | 1 g | 8.7 g | 0.1 g |
| 8 oz / ½ lb (227 g) | 79 kcal | 2 g | 17.5 g | 0.2 g |
| 1 lb (454 g) | 159 kcal | 4.1 g | 34.9 g | 0.5 g |
Data sourced from USDA FoodData Central Foundation Foods dataset (public domain, CC0). Laboratory food profile and analytical measurements verified under USDA FDC ID 1104962.
View raw USDA laboratory entry →How white onions compares to other vegetables
Against the 80 vegetables in this database, white onions ranks 45th lowest in calories and 59th highest in protein. The category averages 50 kcal per 100 g, so this one is 30% below it. The lightest option in the category is pickles, cucumber, dill or kosher dill at 12 kcal per 100 g, and the protein leader is flour, potato at 8.1 g per 100 g.
| Vegetables (by calories) | Calories | Protein | kcal/g |
|---|---|---|---|
| 🍽️ Turnips, raw | 34 kcal | 1 g | 0.34 |
| 🥬 Kale, raw | 35 kcal | 2.9 g | 0.35 |
| 🧅 Onions, white, raw (this page) | 35 kcal | 0.9 g | 0.35 |
| 🥬 Kale, frozen, cooked, boiled, drained, without salt | 36 kcal | 2.9 g | 0.36 |
| 🥕 Carrots, frozen, unprepared | 37 kcal | 0.8 g | 0.37 |
Portion planning with white onions
- 100 calories comes to about 286 g (10.1 oz).
- Fibre density is 3.4 g per 100 calories, covering 4% of the daily fibre target per 100 g.
- Macro split by calories: 87% carbs, 10% protein, 3% fat.
Nutrient screening detail
The badges near the top of this page come from screening the per-100 g values against the FDA nutrient-content thresholds in 21 CFR 101.54–101.62. The regulations define those claims per reference serving rather than per 100 g, so treat these as a like-for-like comparison between foods, not as a statement about a product label:
- Low calorie — 35 kcal per 100 g (≤ 40)
- Low fat — 0.1 g per 100 g (≤ 3 g)
- Low saturated fat — 0 g per 100 g (≤ 1 g)
- Sodium free — 2 mg per 100 g (< 5 mg)
Track white onions for free
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White Onions FAQ & Nutrition Questions
How many calories and carbs are in 100 g of white onions?
One serving of 100 g provides 35 calories, 7.7 g total carbs (6.5 g net carbs), 0.9 g protein, and 0.1 g fat.
How many calories are in 100 g of white onions?
White Onions contains 35 calories per 100 g, with 0.9 g protein, 7.7 g carbohydrate, and 0.1 g fat. Use the interactive calculator above to scale to any custom amount.
What is the USDA FoodData Central (FDC) ID for white onions?
The official USDA FoodData Central ID for "Onions, white, raw" is FDC ID: 1104962. You can view the verified laboratory analytical record on the USDA FoodData Central Database.
What is the macronutrient breakdown of white onions?
By calories, white onions is approximately 87% carbohydrates, 10% protein, and 3% fat.
How many calories are in an ounce of white onions?
One ounce (28 g) of white onions has 10 calories, with 0.3 g protein, 2.2 g carbs and 0 g fat. Four ounces (113 g) comes to 40 calories, and a full pound (454 g) to 159 calories.
How much white onions is 100 calories?
About 286 g of white onions supplies 100 calories, because it carries 0.35 kcal per gram (very low energy density). You can eat a large volume of this for very few calories, which makes it useful for filling out a meal in a deficit.
How many net carbs are in white onions?
Per 100 g, white onions has 6.5 g net carbs — 7.7 g total carbohydrate minus 1.2 g fibre.
Is white onions high or low in calories for a vegetable?
White Onions sits 30% below the vegetables average of 50 kcal per 100 g, ranking 45th lowest of 80 in this category.
Is this nutrition data free to use?
Yes. The data is sourced directly from USDA FoodData Central (CC0 public domain). Viewing and scaling portions here is 100% free with no sign-up — and you can log this food free in our online food diary.