FoundationVegetables and Vegetable Productsvalues per 100 g

Onions, yellow, raw

Energy

38 kcal / 100 g

Nutrients reported

Measured portions

Portion converter

Nutrition data is published per 100 g. Pick a portion to see what it works out to.

PortionHow manyOr enter grams

Total weight

143 g

1 Onion (Edible) × 1 — using the published 143 g per portion

Nutrient	Per 100 g	In this amount
Energy(chosen energy value)	38 kcal	54 kcal
Water	90.1 g	128.8 g
Energy (Atwater General Factors)	38 kcal	54 kcal
Energy (Atwater Specific Factors)	36 kcal	51 kcal
Energy	160 kJ	229 kJ
Protein	0.83 g	1.19 g
Total lipid (fat)	0.05 g	0.07 g
Ash	0.41 g	0.59 g
Carbohydrate, by difference	8.61 g	12.3 g
Fiber, total dietary	1.90 g	2.72 g
Total dietary fiber (AOAC 2011.25)	2.71 g	3.88 g
Sugars, Total NLEA	5.82 g	8.32 g
Sucrose	1.60 g	2.29 g
Glucose	2.31 g	3.30 g
Fructose	1.91 g	2.73 g
Lactose	0 g	0 g

Estimates. Portion weights are the published averages for this food. A cup of chopped carrot and a cup of sliced carrot do not weigh the same, so treat the result as approximate.

About zeros. A value of 0 may mean the nutrient is genuinely absent, or that it was not measured / was below the limit of detection. USDA does not distinguish between the two, so this site does not use 0 values for filtering or for "free from" claims.

This converter does not use zero values to claim a food is free of anything, and it is not dietary or medical advice.

Nutrition per 100 g

30 nutrients reported for this food. "Samples" is the number of analytical samples the value is based on.

Nutrient	Per 100 g	Samples
Energy(chosen energy value)	38 kcal	—
Water	90.1 g	6
Energy (Atwater General Factors)	38 kcal	—
Energy (Atwater Specific Factors)	36 kcal	—
Energy	160 kJ	—
Protein	0.83 g	6
Total lipid (fat)	0.05 g	6
Ash	0.41 g	6
Carbohydrate, by difference	8.61 g	—
Fiber, total dietary	1.90 g	6
Total dietary fiber (AOAC 2011.25)	2.71 g	6
Sugars, Total NLEA	5.82 g	—
Sucrose	1.60 g	4
Glucose	2.31 g	6
Fructose	1.91 g	6
Lactose	0 g	6
Maltose	0 g	6
Calcium, Ca	15.0 mg	6
Iron, Fe	0.28 mg	6
Magnesium, Mg	9.00 mg	6
Phosphorus, P	34.0 mg	6
Potassium, K	182.0 mg	6
Sodium, Na	1.00 mg	6
Zinc, Zn	0.20 mg	6
Copper, Cu	0.04 mg	6
Manganese, Mn	0.14 mg	6
Iodine, I	0 µg	6
Selenium, Se	0 µg	6
Vitamin C, total ascorbic acid	8.20 mg	6
Biotin	0 µg	6

Why there is only one energy value here

USDA publishes three different energy nutrients (IDs 1008, 2047, 2048) plus a kilojoule value. This page uses 1008 — Energy — falling back to the others only when it is absent. Sites that mix them can report different calorie counts for the same food.

Published portion sizes

These are the measured weights this site uses for conversion.

Portion	Grams	Energy
1 Onion (Edible)	143	54

Portions without a measured weight are listed but cannot be converted — we do not guess a weight for them.

Allergens: do not rely on this page

This dataset has no structured allergen field, and reference values describe a generic food — not the product you are holding. Always read the actual label before eating anything.

If you have a food allergy, treat this page as background information only.

Similar foods

Vegetables and Vegetable Products

Source: U.S. Department of Agriculture, Agricultural Research Service. FoodData Central, 2019. fdc.nal.usda.gov. (Foundation Foods, release 2026-04-30) — https://fdc.nal.usda.gov/ · Data last updated 2026-09-27