Yellow Onions Calories and Nutrition Facts
Yellow Onions has 38 calories per 100 g, with 0.8 g protein, 8.6 g carbs and 0.1 g fat. Official USDA analytical record: Onions, yellow, raw (FDC ID: 790646).
One standard serving of yellow onions (1 Onion, edible (143 g)) contains 54 calories, 1.1g protein, 12.3g total carbs (9.6g net carbs), and 0.1g fat. Per 100 grams, it supplies 38 calories.
Energy density
0.38 kcal/g
very low
Protein / 100 kcal
2.1 g
satiety per calorie
Net carbs / 100 g
6.7 g
carbs minus fibre
100 kcal portion
263 g
≈ 9.3 oz
- Sugars
- 8.3g
- Fibre
- 2.7g
- Saturated fat
- 0g
- Sodium
- 1mg
Yellow Onions Portion & Serving Size Comparison
Compare calories, carbs, net carbs, and macros across common household measurements.
| Portion Size | Weight | Calories | Total Carbs | Net Carbs | Protein | Fat |
|---|---|---|---|---|---|---|
| 100 g | 100 g | 38 kcal | 8.6 g | 6.7 g | 0.8 g | 0.1 g |
| 1 Onion, edible (143 g) | 143 g | 54 kcal | 12.3 g | 9.6 g | 1.1 g | 0.1 g |
Onions, yellow, raw nutrition facts
The table below shows the complete nutritional profile for onions, yellow, raw per 100 g (the laboratory analytical standard) and per 1 Onion, edible (143 g), 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 | Per 1 Onion, edible (143 g) | % DV* |
|---|---|---|---|
| Calories | 38 kcal | 54 kcal | — |
| Protein | 0.8 g | 1.1 g | 2% |
| Carbohydrate | 8.6 g | 12.3 g | 3% |
| Fat | 0.1 g | 0.1 g | 0% |
| Sugars | 5.8 g | 8.3 g | — |
| Fibre | 1.9 g | 2.7 g | 7% |
| Saturated fat | 0 g | 0 g | 0% |
| Sodium | 1 mg | 1 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.
Yellow 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 0.38 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) | 11 kcal | 0.2 g | 2.4 g | 0 g |
| 100 g (3.5 oz) | 38 kcal | 0.8 g | 8.6 g | 0.1 g |
| 4 oz (113 g) | 43 kcal | 0.9 g | 9.8 g | 0.1 g |
| 8 oz / ½ lb (227 g) | 86 kcal | 1.8 g | 19.5 g | 0.2 g |
| 1 lb (454 g) | 172 kcal | 3.6 g | 39 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 790646.
View raw USDA laboratory entry →How yellow onions compares to other vegetables
Against the 80 vegetables in this database, yellow onions ranks 49th lowest in calories and 68th highest in protein. The category averages 50 kcal per 100 g, so this one is 24% 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 |
|---|---|---|---|
| 🥕 Carrots, frozen, unprepared | 37 kcal | 0.8 g | 0.37 |
| 🍄 Mushroom, maitake | 38 kcal | 2.2 g | 0.38 |
| 🧅 Onions, yellow, raw (this page) | 38 kcal | 0.8 g | 0.38 |
| 🍅 Tomatoes, crushed, canned | 38 kcal | 1.4 g | 0.38 |
| 🍄 Mushroom, pioppini | 39 kcal | 3.5 g | 0.39 |
Portion planning with yellow onions
- 100 calories comes to about 263 g (9.3 oz).
- Fibre density is 5 g per 100 calories, covering 7% of the daily fibre target per 100 g.
- Macro split by calories: 89% carbs, 8% protein, 2% 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 — 38 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 — 1 mg per 100 g (< 5 mg)
Track yellow onions for free
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Yellow Onions FAQ & Nutrition Questions
How many calories and carbs are in 1 Onion, edible (143 g) of yellow onions?
One serving of 1 Onion, edible (143 g) provides 54 calories, 12.3 g total carbs (9.6 g net carbs), 1.1 g protein, and 0.1 g fat.
How many calories are in 100 g of yellow onions?
Yellow Onions contains 38 calories per 100 g, with 0.8 g protein, 8.6 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 yellow onions?
The official USDA FoodData Central ID for "Onions, yellow, raw" is FDC ID: 790646. You can view the verified laboratory analytical record on the USDA FoodData Central Database.
What is the macronutrient breakdown of yellow onions?
By calories, yellow onions is approximately 89% carbohydrates, 8% protein, and 2% fat.
How many calories are in an ounce of yellow onions?
One ounce (28 g) of yellow onions has 11 calories, with 0.2 g protein, 2.4 g carbs and 0 g fat. Four ounces (113 g) comes to 43 calories, and a full pound (454 g) to 172 calories.
How much yellow onions is 100 calories?
About 263 g of yellow onions supplies 100 calories, because it carries 0.38 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 yellow onions?
Per 100 g, yellow onions has 6.7 g net carbs — 8.6 g total carbohydrate minus 1.9 g fibre.
Is yellow onions high or low in calories for a vegetable?
Yellow Onions sits 24% below the vegetables average of 50 kcal per 100 g, ranking 49th 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.