How many calories are in onion?

Onion has about 40 calories per 100g.

How many calories are in a typical portion of onion?

A typical portion (1 medium, 110 g) has about 44 kcal and 1.2 g of protein.

Is onion high in protein?

Onion provides around 1.1g of protein per 100g.

Can I use this for meal tracking?

Yes. Use these nutrition estimates to log meals and compare your daily calorie and macro totals.

Calories in Onion

Onion has 40 kcal per 100 g. 1 medium (110 g) has about 44 kcal.

A base vegetable for countless dishes, low in calories when raw. Nutrition values below are estimates per 100g and can help you track calories and macros.

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Nutrient	Per 100g
Calories	40 kcal
Protein	1.1 g
Fat	0.1 g
Carbs	9.3 g
Fiber	1.7 g
Sugar	4.2 g

Nutrition by grams

Typical portions

Grams

Calories: 40 kcal
Protein: 1.1 g
Fat: 0.1 g
Carbs: 9.3 g

Calories in typical portions

Portion	Weight	Calories	Protein
100 g	100 g	40 kcal	1.1 g
1 medium	110 g	44 kcal	1.2 g
1 cup	160 g	64 kcal	1.8 g

Tips for tracking onion

A medium onion is about 44 kcal. When you sauté it, the oil matters far more: one tablespoon adds about 120 kcal.
Onion rings and fried onions are a different food altogether, often 300–400 kcal per 100 g.

How long it takes to burn 44 kcal (1 medium)

Walking
10 min
Cycling
5 min
Running
4 min

Rough estimates for a 70 kg adult at a steady pace.

More Fruits & vegetables

Calories in Banana · 89 kcal/100 g
Calories in Apple · 52 kcal/100 g
Calories in Avocado · 160 kcal/100 g
Calories in Orange · 47 kcal/100 g
Calories in Strawberries · 32 kcal/100 g
Calories in Blueberries · 57 kcal/100 g

How many calories are in onion?: Onion has about 40 calories per 100g.
How many calories are in a typical portion of onion?: A typical portion (1 medium, 110 g) has about 44 kcal and 1.2 g of protein.
Is onion high in protein?: Onion provides around 1.1g of protein per 100g.
Can I use this for meal tracking?: Yes. Use these nutrition estimates to log meals and compare your daily calorie and macro totals.

Nutrition data: USDA FoodData Central. Values are averages; brands and preparation can differ.