Cratox AI
Reviewed by Cratox Nutrition Team · Updated August 13, 2026

Cratox team note

Cooked, boiled onions provide 42 kcal and 1.4 g of protein per 100 g, making them a low-calorie addition to meals. They pair well with grilled meats or can be added to soups for enhanced flavor and nutrition.

Onions, cooked, boiled vs Carrots, raw: nutrition compared

Nutrient (per 100 g)Onions, cooked, boiledCarrots, raw
Calories42 kcal41 kcal
Protein1.4 g0.9 g
Carbohydrates9.6 g9.6 g
Fat0.2 g0.2 g
Fibre1.4 g2.8 g
Sugar4.7 g4.7 g
Sodium239 mg69 mg

All values per 100 g. Source: USDA FoodData Central.

Onions, cooked, boiled - nutritional information

Onions, cooked, boiled

🔥 42 Calories
💪 1.4g Protein
9.6g Carbohydrates
🥑 0.2g Fat

Onions, cooked, boiled provides 42 kcal per 100 g, with 1.4 g of protein, 9.6 g of carbohydrates and 0.2 g of fat. 1 cup of Onions, cooked, boiled (210 g) provides about 88 kcal.

At a glance

A fast summary built from the current nutrition profile per 100g.

Category
Vegetables
Onions, cooked, boiled
Energy density
Light
42 kcal per 100g
Macro energy profile
Carb-led
12% Protein · 84% Carbohydrates · 4% Fat
Glycemic profile
Low GI
GI 10 · GL 4
Notable signals
Low in fatLow in sugarUSDA data

Nutritional Information

42
kcal/100g
Protein
1.4g
Carbohydrates
9.6g
Fat
0.2g
Glycemic Index:
10

Nutritional Information (per 100g)

NutrientAmount per 100 g
Calories42 kcal
Protein1.4 g
Carbohydrates9.6 g
Fat0.2 g
Fiber1.4 g
Sugar4.7 g
Sodium239 mg

USDA data · USDA FoodData Central

Calories per portion

PortionWeightCalories
1 cup210 g88 kcal
1 tbsp chopped15 g6 kcal
1 large piece128 g54 kcal
1 slice large32 g13 kcal
100 g100 g42 kcal

Portion weights: USDA FoodData Central

Portion calculator

Calories
42 kcal
Protein
1.4 g
Carbohydrates
9.6 g
Fat
0.2 g
Fiber
1.4 g
Sugar
4.7 g
Sodium
239 mg

All values are computed from the per-100 g nutrition data (source: USDA).

About Onions, cooked, boiled

Onions, cooked and boiled, are a versatile vegetable that belongs to the Allium family, which also includes garlic, leeks, and shallots. Originating from Central Asia, onions have been cultivated for thousands of years and are now grown worldwide. They are a staple in many cuisines, valued for their flavor, aroma, and potential health benefits. Cooking onions enhances their sweetness and mellows their pungency, making them a popular ingredient in soups, stews, sautéed dishes, and various recipes across cultures. Nutritionally, boiled onions are low in calories, providing only 42 calories per 100 grams, while also being rich in carbohydrates, particularly natural sugars. They contain a small amount of protein and fats, making them a low-fat food option. Moreover, onions are a source of dietary fiber, which promotes digestive health, and are rich in antioxidants, which help combat oxidative stress in the body. Incorporating boiled onions into your diet can enhance flavor while contributing to overall health.

Health Benefits

Rich in antioxidants, particularly flavonoids, which help reduce inflammation.
Supports heart health by lowering blood pressure and cholesterol levels.
May improve digestive health due to its fiber content.
Contains compounds that may have anti-cancer properties.
Supports immune function due to its vitamin C content.
Can help regulate blood sugar levels, making it beneficial for diabetics.
Aids in respiratory health by acting as a natural decongestant.
May help improve bone density and health.
Promotes skin health and can assist in wound healing.
Acts as a natural anti-bacterial agent.

Recommended Food Pairings

🥗
Onions and bell peppers - create a flavorful sauté for omelets or fajitas.
🥗
Onions and tomatoes - excellent in sauces, providing a balance of sweetness and acidity.
🥗
Onions and garlic - a classic combination that enhances the flavor of many dishes.
🥗
Onions and carrots - when roasted together, they caramelize beautifully, adding depth to salads.
🥗
Onions and potatoes - a hearty mix for stews and casseroles.

How to Consume

Serving size
Recommended serving is 100g, approximately 1 medium onion.
Frequency
Recommended frequency is 2-3 times per week.
  • Sauté onions in olive oil for a rich flavor base.
  • Add cooked onions to salads for added texture.
  • Incorporate boiled onions into soups for enhanced taste.
  • Use onions in wrap fillings for a flavorful addition.
  • Caramelize onions for a sweet topping on burgers or pizzas.

Selection & Storage

How to choose:

  • Select onions that are firm and heavy for their size.
  • Avoid onions with soft spots or signs of decay.
  • Look for dry, papery skin which indicates freshness.
  • Choose onions that are free from sprouts or green shoots.
Storage
Store onions in a cool, dark, well-ventilated place at room temperature.
Shelf life
Onions can last for 1-2 months at room temperature; 5-7 days refrigerated.

Warnings & Contraindications

  • ⚠️Individuals with certain digestive disorders may experience discomfort from onions.
  • ⚠️People with allergies to other Allium vegetables should avoid onions.
  • ⚠️Excessive consumption may lead to gastrointestinal distress.
  • ⚠️Cooking onions can reduce their sulfur content, but overcooking may diminish some nutrients.

Frequently Asked Questions

How many calories does Onions, cooked, boiled have?

Onions, cooked and boiled, contain approximately 42 calories per 100 grams. This makes them a very low-calorie food choice, ideal for those looking to manage their weight while still enjoying flavorful dishes.

Is Onions, cooked, boiled healthy?

Yes, boiled onions are considered healthy as they are low in calories and fat while being rich in vitamins, minerals, and antioxidants. They can contribute to heart health, improve digestion, and support overall well-being.

How should Onions, cooked, boiled be stored?

Cooked and boiled onions should be stored in an airtight container in the refrigerator. They can last for about 5-7 days. If you want to keep them longer, consider freezing them, which can extend their shelf life for several months.

What are the benefits of eating Onions, cooked, boiled?

Eating cooked, boiled onions provides numerous health benefits, including improved heart health, enhanced immune function, and better digestive health due to their fiber content. They also possess anti-inflammatory and antioxidant properties.

How much Onions, cooked, boiled can I eat per day?

A recommended daily intake of cooked onions is about 100-150 grams. This portion allows you to enjoy their health benefits while balancing your overall nutritional intake.

How many calories are in 1 cup of Onions, cooked, boiled (210 g)?

1 cup of Onions, cooked, boiled (210 g) has about 88 kcal — 2.9 g protein, 20.2 g carbohydrates and 0.4 g fat (calculated from the USDA values per 100 g).

How many calories are in 1 tbsp chopped of Onions, cooked, boiled (15 g)?

1 tbsp chopped of Onions, cooked, boiled (15 g) has about 6 kcal — 0.2 g protein, 1.4 g carbohydrates and 0 g fat (calculated from the USDA values per 100 g).

How many calories are in 1 large piece of Onions, cooked, boiled (128 g)?

1 large piece of Onions, cooked, boiled (128 g) has about 54 kcal — 1.8 g protein, 12.3 g carbohydrates and 0.3 g fat (calculated from the USDA values per 100 g).

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