Red Onion Nutrition Facts

Calories, fat, protein, and carbohydrate values for Red Onion.


There are 41 calories in Red Onion.


Nutrition Facts
Red Onion
Serving Size:


medium (94 grams)

Amount Per Serving
Calories from Fat 1.6
Calories 41

% Daily Value*

Total Fat 0.2 grams

Saturated Fat 0 grams

Trans Fat 0 grams
Polyunsaturated Fat 0.1 grams
Monounsaturated Fat 0 grams

Cholesterol 0 milligrams

Sodium 2.8 milligrams

Potassium 156 milligrams

Total Carbohydrates 9.5 grams

Dietary Fiber 1.3 grams

Sugars 4.4 grams
Protein 1.3 grams

Vitamin A


Vitamin C





Percent Daily Values are based on a 2000 calorie diet.

Food / Beverages > Produce > Onions > Red Onions (Fresh)

How long would it take to burn off 40 KCal?
Walking (3mph) 11 minutes
Running (6mph) 4 minutes
Bicycling (10mph) 6 minutes
Values estimated based on person weighing 140 lbs.

Are red onions and brown onions the same?

Red onions have a much higher sugar content and are therefore sweeter than brown onions. Most often used raw in salads and salsas for their colour and mild flavour. They are also perfect for pickling, lending a pink colour to the pickle. They’re also great for caramelising.

What is the difference between red onion and white onion?

The main difference is that the red onion will lose some of its characteristic flavor when cooked versus when eaten raw. Red onions deliver a milder onion flavor to dishes when cooked while still giving a dish color. It not only becomes sweeter just like other onions but its color deepens, too.

What are red onions called?

Red onions (also known as purple onions in some mainland European countries, though not the UK) are cultivars of the onion (Allium cepa), and have purplish-red skin and white flesh tinged with red. They are most commonly used in cooking, but the skin has also been used as a dye.

Is a red onion A Sweet Onion?

Red Onions

Red onions are subtly sweet and mild enough to eat raw. The vivid magenta color of their skin makes a great addition to salads and salsas. If you find the flavor too strong when raw, try soaking them in cold water before using.

Are shallots and red onions the same?

They vary in size and color but are most commonly white, yellow, or red. Unlike onions, shallots grow in clusters, and the cloves are oblong in shape, with colors ranging from grey to pale purple or brown. Shallots also have a mild, somewhat sweet flavor, which is more subtle than the sharp, pungent taste of onions.

What is the difference between red onion and yellow onion?

Red Onions

Sharper and spicier than yellow onions, you’ll often see them raw, whether in salads, like Greek salad or kachumber, or alongside long-cooking braises. Soak them in ice water as you prep your other ingredients to make them extra crisp and rid them of some fierceness.

Can I substitute red onion for yellow onion?

Red onions will sometimes lend a red tinge to your cooking, but are a decent flavor substitute for yellow or white onions.