Food · Vegetables and Vegetable Products
Onions nutrition facts
A typical portion of onions (1 medium; 110 g, raw (SR Legacy)) has 45 calories and 1g of protein (USDA FoodData Central). USDA lists 14 descriptions of it: per 100 g they range from 19 calories (canned, solids and liquids) to 47 (cooked, no added fat).
Nutrition Facts
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice. Protein % DV here is not corrected for protein quality.
USDA values per 100 g for Onions, raw, scaled to the portion. Check the USDA record.
- Protein per 100 g
- 1.1g
- more than 17% of 8,218 USDA reference foods
- Calories per 100 g
- 40
- more than 10% of reference foods
- Sodium per 100 g
- 4mg
- more than 10% of reference foods
1 medium weighs 110 g in USDA's record for Onions, raw (FDC 170000).
Where the calories come from: 88% carbohydrate, 2% fat and 10% protein (4 calories a gram of protein or carbohydrate, 9 of fat).
Every form of onions USDA describes
No added fat has the most calories per 100 g (47); the fewest: Canned, solids and liquids (19)
| USDA description | Calories | Protein | Fat | Sodium |
|---|---|---|---|---|
| Onions, raw (SR Legacy) | 40 | 1.1 g | 0.1 g | 4 mg |
| Onions, spring or scallions (includes tops and bulb), raw | 32 | 1.8 g | 0.2 g | 16 mg |
| Onions, cooked, boiled, drained, without salt | 44 | 1.4 g | 0.2 g | 3 mg |
| Onions, cooked, boiled, drained, with salt | 42 | 1.4 g | 0.2 g | 239 mg |
| Onions, cooked, no added fat | 47 | 1.3 g | 0.1 g | 141 mg |
| Onions, frozen, whole, unprepared | 35 | 0.9 g | 0.1 g | 10 mg |
| Onions, raw (Survey)Same values: Onions, for use on a sandwich | 38 | 0.9 g | 0.1 g | 1 mg |
| Onions, canned, solids and liquids | 19 | 0.9 g | 0.1 g | 371 mg |
| Onions, frozen, chopped, unprepared | 29 | 0.8 g | 0.1 g | 12 mg |
| Onions, frozen, chopped, cooked, boiled, drained, with salt | 26 | 0.8 g | 0.1 g | 248 mg |
| Onions, frozen, chopped, cooked, boiled, drained, without salt | 28 | 0.8 g | 0.1 g | 12 mg |
| Onions, frozen, whole, cooked, boiled, drained, without salt | 28 | 0.7 g | 0.1 g | 8 mg |
| Onions, frozen, whole, cooked, boiled, drained, with salt | 26 | 0.7 g | 0.1 g | 244 mg |
Every nutrient in this record (115)
The portion is 1 medium (110 g); % DV is for that portion.
Energy, macronutrients and sugars (21)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Protein | 1.21 g | 1.10 g | 2% |
| Total lipid (fat) | 0.11 g | 0.10 g | 0% |
| Carbohydrate, by difference | 10.3 g | 9.34 g | 4% |
| Ash | 0.39 g | 0.35 g | |
| Energy | 44.0 kcal | 40.0 kcal | |
| Starch | 0 g | 0 g | |
| Sucrose | 1.09 g | 0.99 g | |
| Glucose | 2.17 g | 1.97 g | |
| Fructose | 1.42 g | 1.29 g | |
| Lactose | 0 g | 0 g | |
| Maltose | 0 g | 0 g | |
| Alcohol, ethyl | 0 g | 0 g | |
| Water | 98.0 g | 89.1 g | |
| Total Sugars | 4.66 g | 4.24 g | |
| Galactose | 0 g | 0 g | |
| Fiber, total dietary | 1.87 g | 1.70 g | 7% |
| Cholesterol | 0 mg | 0 mg | 0% |
| Fatty acids, total trans | 0 g | 0 g | |
| Fatty acids, total saturated | 0.046 g | 0.042 g | 0% |
| Fatty acids, total monounsaturated | 0.014 g | 0.013 g | |
| Fatty acids, total polyunsaturated | 0.019 g | 0.017 g |
Minerals (11)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Calcium, Ca | 25.3 mg | 23.0 mg | 2% |
| Iron, Fe | 0.23 mg | 0.21 mg | 1% |
| Magnesium, Mg | 11.0 mg | 10.0 mg | 3% |
| Phosphorus, P | 31.9 mg | 29.0 mg | 3% |
| Potassium, K | 161 mg | 146 mg | 3% |
| Sodium, Na | 4.40 mg | 4.00 mg | 0% |
| Zinc, Zn | 0.19 mg | 0.17 mg | 2% |
| Copper, Cu | 0.043 mg | 0.039 mg | 5% |
| Fluoride, F | 1.21 µg | 1.10 µg | |
| Manganese, Mn | 0.14 mg | 0.13 mg | 6% |
| Selenium, Se | 0.55 µg | 0.50 µg | 1% |
Vitamins (33)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Retinol | 0 µg | 0 µg | |
| Vitamin A, RAE | 0 µg | 0 µg | 0% |
| Carotene, beta | 1.10 µg | 1.00 µg | |
| Carotene, alpha | 0 µg | 0 µg | |
| Vitamin E (alpha-tocopherol) | 0.022 mg | 0.020 mg | 0% |
| Vitamin D (D2 + D3) | 0 µg | 0 µg | 0% |
| Cryptoxanthin, beta | 0 µg | 0 µg | |
| Lycopene | 0 µg | 0 µg | |
| Lutein + zeaxanthin | 4.40 µg | 4.00 µg | |
| Tocopherol, beta | 0 mg | 0 mg | |
| Tocopherol, gamma | 0 mg | 0 mg | |
| Tocopherol, delta | 0 mg | 0 mg | |
| Tocotrienol, alpha | 0.044 mg | 0.040 mg | |
| Tocotrienol, beta | 0 mg | 0 mg | |
| Tocotrienol, gamma | 0 mg | 0 mg | |
| Tocotrienol, delta | 0 mg | 0 mg | |
| Vitamin C, total ascorbic acid | 8.14 mg | 7.40 mg | 9% |
| Thiamin | 0.051 mg | 0.046 mg | 4% |
| Riboflavin | 0.030 mg | 0.027 mg | 2% |
| Niacin | 0.13 mg | 0.12 mg | 1% |
| Pantothenic acid | 0.14 mg | 0.12 mg | |
| Vitamin B-6 | 0.13 mg | 0.12 mg | 8% |
| Folate, total | 20.9 µg | 19.0 µg | |
| Vitamin B-12 | 0 µg | 0 µg | 0% |
| Choline, total | 6.71 mg | 6.10 mg | 1% |
| Vitamin K (Dihydrophylloquinone) | 0 µg | 0 µg | |
| Vitamin K (phylloquinone) | 0.44 µg | 0.40 µg | 0% |
| Folic acid | 0 µg | 0 µg | |
| Folate, food | 20.9 µg | 19.0 µg | |
| Folate, DFE | 20.9 µg | 19.0 µg | 5% |
| Betaine | 0.11 mg | 0.10 mg | |
| Vitamin E, added | 0 mg | 0 mg | |
| Vitamin B-12, added | 0 µg | 0 µg |
Amino acids (18)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Tryptophan | 0.015 g | 0.014 g | |
| Threonine | 0.023 g | 0.021 g | |
| Isoleucine | 0.015 g | 0.014 g | |
| Leucine | 0.028 g | 0.025 g | |
| Lysine | 0.043 g | 0.039 g | |
| Methionine | 0.0022 g | 0.0020 g | |
| Cystine | 0.0044 g | 0.0040 g | |
| Phenylalanine | 0.028 g | 0.025 g | |
| Tyrosine | 0.015 g | 0.014 g | |
| Valine | 0.023 g | 0.021 g | |
| Arginine | 0.11 g | 0.10 g | |
| Histidine | 0.015 g | 0.014 g | |
| Alanine | 0.023 g | 0.021 g | |
| Aspartic acid | 0.10 g | 0.091 g | |
| Glutamic acid | 0.28 g | 0.26 g | |
| Glycine | 0.028 g | 0.025 g | |
| Proline | 0.013 g | 0.012 g | |
| Serine | 0.023 g | 0.021 g |
Fatty acids (30)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| SFA 4:0 | 0 g | 0 g | |
| SFA 6:0 | 0 g | 0 g | |
| SFA 8:0 | 0 g | 0 g | |
| SFA 10:0 | 0 g | 0 g | |
| SFA 12:0 | 0 g | 0 g | |
| SFA 14:0 | 0.0044 g | 0.0040 g | |
| SFA 16:0 | 0.037 g | 0.034 g | |
| SFA 18:0 | 0.0044 g | 0.0040 g | |
| SFA 20:0 | 0 g | 0 g | |
| MUFA 18:1 | 0.014 g | 0.013 g | |
| PUFA 18:2 | 0.014 g | 0.013 g | |
| PUFA 18:3 | 0.0044 g | 0.0040 g | |
| PUFA 20:4 | 0 g | 0 g | |
| PUFA 22:6 n-3 (DHA) | 0 g | 0 g | |
| SFA 22:0 | 0 g | 0 g | |
| MUFA 14:1 | 0 g | 0 g | |
| MUFA 16:1 | 0 g | 0 g | |
| PUFA 18:4 | 0 g | 0 g | |
| MUFA 20:1 | 0 g | 0 g | |
| PUFA 20:5 n-3 (EPA) | 0 g | 0 g | |
| MUFA 22:1 | 0 g | 0 g | |
| PUFA 22:5 n-3 (DPA) | 0 g | 0 g | |
| Phytosterols | 16.5 mg | 15.0 mg | |
| SFA 15:0 | 0 g | 0 g | |
| SFA 17:0 | 0 g | 0 g | |
| SFA 24:0 | 0 g | 0 g | |
| PUFA 20:2 n-6 c,c | 0 g | 0 g | |
| MUFA 17:1 | 0 g | 0 g | |
| PUFA 20:3 | 0 g | 0 g | |
| MUFA 15:1 | 0 g | 0 g |
Source: USDA FoodData Central, FDC 170000: every value the record reports, per 100 g as USDA gives it and scaled to the portion; Daily Values: 21 CFR 101.9.
Source: USDA FoodData Central (SR Legacy, Foundation Foods and Survey foods), April 30, 2026 release.
Questions
How many calories are in onions?
45 in 1 medium (110 g) of raw (SR Legacy); 19 to 47 per 100 g across USDA's descriptions.
How much protein is in onions?
1g in 1 medium; 1.1 g per 100 g.
How much sodium is in onions?
0mg in 1 medium; 4 mg per 100 g. Salt added in cooking changes it: USDA lists salted and unsalted forms separately where it measured both.
Sources for this page
- USDA FoodData Central
- the food and product records, April 30, 2026 release. fdc.nal.usda.gov
- FoodData Central documentation
- what each data type is and how branded records are submitted. fdc.nal.usda.gov
- USDA Food and Nutrient Database for Dietary Studies
- the survey foods and their portions. ars.usda.gov
- 21 CFR 101.9, Nutrition labeling of food
- the label format, rounding and Daily Values. ecfr.gov
- FDA, How to Understand and Use the Nutrition Facts Label
- the 5% and 20% Daily Value rule. fda.gov