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Onion, red onion Calories and nutrition facts · Vegetables

37 kcal per medium (110 g)
Carbs
6 g
Fibre
2.2 g
Sugars
3.9 g
Protein
1.7 g
Fat
0.13 g
34 kcal per 100 g
Carbs
5.4 g
Fibre
2 g
Sugars
3.6 g
Protein
1.5 g
Fat
0.11 g

Where the calories come from

Protein 21% Carbs 76% Fat 4%

Onion, red onion has 37 kcal per medium (110 g), with 6 g carbs, 2.2 g fibre, 1.7 g protein and 0.13 g fat. 100 g has 34 kcal.

Share of your daily needs in one medium

Diet tags

Cholesterol reduced Egg free Gluten free Lacto-ovo vegetarian Lactose free Lacto vegetarian Milk free Low gluten Soy free Unsweetened Vegan

Last updated November 10, 2026 · Where the data comes from

Get to know onion, red onion in Nutriely

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Other forms of onion, red onion

How it compares with other vegetables

Per 100 g, against the 99 vegetables in our catalog.

  • Calories 34 kcal · typical 31 kcal
  • Vitamin K 0.7 µg · typical 29.9 µg

    Less vitamin K than 89% of vegetables.

  • Vitamin C 5.3 mg · typical 21 mg

    Less vitamin C than 81% of vegetables.

  • Folate 27.1 µg · typical 51 µg
  • Vitamin A 0.57 µg · typical 50 µg

    Less vitamin A than 89% of vegetables.

  • Potassium 220 mg · typical 350 mg

    Less potassium than 87% of vegetables.

The bar shows this food; the line marks the typical (median) value of the category.

Nutrients in onion, red onion

Pick an amount to see what it gives you. Tap a nutrient to learn what it does.

% of the daily value for a healthy adult. Your own needs depend on age, sex and activity.

Energy and macros
Vitamins
Minerals
Carbohydrates
Fats
Amino acids

Amino acid data is mapped from the USDA database, for information only.

Onion, red onion in other food databases

The same food in national food composition databases, next to ours. Per 100 g.

Per 100 g Nutriely Fineli USDA
Energy (kcal) 34 34 40
Protein (g) 1.51 1.51 1.1
Fat (g) 0.11 0.11 0.1
Carbohydrates (g) 5.45 5.45 7.64
Sugars (g) 3.59 3.59 4.24
Fibre (g) 1.98 1.98 1.7

Compare every nutrient across databases

Switch between Nutriely, Fineli and USDA for all the vitamins, minerals and amino acids of onion, red onion in the Nutriely app.

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Fineli: “Onion, red onion” · USDA: “Onions, raw”. Databases measure different samples, so some spread is normal. Nutriely's values are what the app uses. Sources and licences.

Similar vegetables

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Where the data comes from

How we combine and check nutrition data: Nutriely data sources.

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