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Calories in an onion

100 g of onion has 40 kcal, 1.1 g of protein, 9.3 g of carbs and 0.1 g of fat. One medium onion is about 110 g, with 44 kcal and 1.2 g of protein.

40kcal / 100 g
Protein 11%Carbs 93%Fat 0%
PortionkcalProteinCarbsFat
100 g401.1 g9.3 g0.1 g
1 medium onion110 g441.2 g10.2 g0.1 g
1 tbsp, chopped10 g40.1 g0.9 g0 g
Fibre
1.7 g
Sugars
4.2 g
Saturated fat
0 g
Sodium
4 mg
Potassium
146 mg
Calcium
23 mg
Iron
0.2 mg
Vitamin C
7.4 mg

Per 100 g. Source: USDA FoodData Central.

How it fits your diet

Onion is in almost every savoury dish yet adds very little: a medium onion is about 44 kcal. What counts is the frying fat, which can be many times the onion’s own calories, so measure the oil and use a non-stick pan.

See also: red onion, green bell pepper, tomato

Frequently asked questions

How many calories are in an onion?

One medium onion (about 110 g) has 44 kcal and 1.2 g of protein.

How many calories are in 100 g of onion?

40 kcal. One medium onion is about 110 g, with 44 kcal and 1.2 g of protein.

How much protein is in an onion?

1.1 g of protein per 100 g, which is 11% of its calories.

Sources

Last updated:

High-protein recipes to go with it

Shakshuka for OneBreakfast · 20 minShakshuka for One391 kcal25 g proteinCottage Cheese Egg MuffinsBreakfast · 25 minCottage Cheese Egg Muffins376 kcal33 g proteinMango Salsa Chicken BowlLunch · 25 minMango Salsa Chicken Bowl507 kcal40 g proteinSteak Fajita WrapLunch · 20 minSteak Fajita Wrap444 kcal38 g proteinMediterranean Quinoa Tuna SaladLunch · 10 minMediterranean Quinoa Tuna Salad382 kcal38 g proteinLentil & Feta SaladLunch · 10 minLentil & Feta Salad386 kcal22 g protein
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