How many calories are in Onions, Cooked?

A 100 g serving of Onions, Cooked has 42 kcal. The calories in your portion depend on its weight and how it is prepared.

How much protein is in Onions, Cooked?

Per 100 g there are 1.4 g of protein — about 3% of the Daily Value (50 g).

How much fat and carbs are in Onions, Cooked?

Per 100 g there are 0.2 g of fat and 9.6 g of carbohydrate, including 1.4 g of fiber.

Vegetables

Onions, Cooked

USDA reference values for onions, cooked (per 100 g).

42kcalCalories

1.4gProtein

0.2gFat

9.6gCarbs

Protein, fat and carb balance

Share of calories from each macronutrient (per 100 g).

Protein 12.8%
Fat 4%
Carbs 83.2%

Full nutrition facts (per 100 g)

Nutrient	Per 100 g	% DV*
Macronutrients
Protein	1.4 g	3%
Total Fat	0.2 g	<1%
Saturated Fat	0 g	<1%
Carbohydrate	9.6 g	3%
Dietary Fiber	1.4 g	5%
Total Sugars	4.7 g	9%
Minerals
Sodium	239 mg	10%
Potassium	166 mg	4%
Calcium	22 mg	2%
Iron	0.2 mg	1%
Magnesium	11 mg	3%
Vitamins
Vitamin C	5.2 mg	6%
Vitamin A	0 mcg	0%
Vitamin D	0 mcg	0%
Other
Cholesterol	0 mg	0%

* Percent of the Daily Value (Daily Value, based on a 2,000 kcal diet).

Data source: USDA FoodData Central. Values are per 100 g of edible portion and are reference figures — they vary by variety, preparation and brand. Last updated: 2026-04-30.

Frequently asked questions

How many calories are in Onions, Cooked?: A 100 g serving of Onions, Cooked has 42 kcal. The calories in your portion depend on its weight and how it is prepared.
How much protein is in Onions, Cooked?: Per 100 g there are 1.4 g of protein — about 3% of the Daily Value (50 g).
How much fat and carbs are in Onions, Cooked?: Per 100 g there are 0.2 g of fat and 9.6 g of carbohydrate, including 1.4 g of fiber.

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Compare Onions, Cooked with: Alfalfa Seeds, Sprouted Amaranth Leaves, Cooked Amaranth Leaves, Cooked Amaranth Leaves, Raw

Note. This information is provided for general reference only and is not medical advice or a diet prescription. If you have a medical condition or special dietary needs, consult a physician or a registered dietitian.