onion nutrition facts
USDA reference data for onion, shown per 100 grams with FDA-rounded values and % Daily Values — the same numbers the Nutrillius label generator uses.
where the calories come from
full nutrition table
| Nutrient | Per 100g | Per onion (~110g) | % DV* |
|---|---|---|---|
| Calories | 40 | 44 | — |
| Total Fat | 0g | 0g | 0% |
| Saturated Fat | 0g | 0g | 0% |
| Cholesterol | 0mg | 0mg | 0% |
| Sodium | 4mg | 4.4mg | 0% |
| Total Carbohydrate | 9.3g | 10.2g | 3% |
| Dietary Fiber | 1.7g | 1.9g | 6% |
| Total Sugars | 4.2g | 4.6g | — |
| Protein | 1.1g | 1.2g | 2% |
| Calcium | 0mg | 0mg | 0% |
| Iron | 0mg | 0mg | 0% |
| Potassium | 146mg | 160.6mg | 3% |
* % Daily Values based on a 2,000-calorie diet (FDA 2020 DVs). Source: USDA FoodData Central reference data.
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frequently asked questions
How many calories are in 100g of onion?
There are 40 calories in 100 grams of onion, with 1.1g protein, 9.3g carbohydrates and 0g fat.
How much protein is in onion?
Onion contains 1.1g of protein per 100 grams — about 2% of the FDA Daily Value.
Is this data suitable for an FDA nutrition label?
Yes — these are USDA reference values, the data source the FDA accepts for database-calculated Nutrition Facts labels. The panel on this page applies real 21 CFR 101.9 rounding. To use onion in your own product label, build it in the free generator.