How Many Calories in a Red Onion

1 medium red onion1 cup of red onion1 large red onion100g of red onion1 slice of or wedge red onion1 small red onion100g of red onion

Onions Welsh Raw

Are Salads Keto?

Most salad items are keto-friendly. Mostly water,it’s hard to actually eat ‘too much’ salad on any diet. Red Onion has much to offer on all diets but watch those salad dressings and if low-carb, watch carrots and sweetcorn.

Red Onion has an abundance of vitamins, minerals, antioxidants, and other phytonutrients.

Below you will find the calorie and nutrition data for your query ‘How Many Calories in a 1 Red Onion’ plus other popular serving quantities. See Calories, Carbs, Fat. Protein and find sound advice on diets, including keto and low carb. Also check out our recipes and meal plans with 1 Red Onion

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Not Searching for How Many Calories in a Red Onion? You will find a search option at the top of the page. We have thousands of no nonsense Calorie pages aimed solely to get you where you want to go.

The average woman needs 1,500 calories per day to lose one pound of weight per week, men 20-30% more. Assuming an average meal of 500 calories, the calories in your 1 red onion are insignificant.

There are 33 calories in 1 medium red onion (123g)

Nutrition in 1 medium red onion

  • Calories: 33
  • Fat: 0.5 g
  • Carbs: 8 g
  • Fiber: 3 g
  • Protein: 2.3 g

There are 48 calories in 1 large red onion (182g)

Nutrition in 1 large red onion

  • Calories: 48
  • Fat: 0.7 g
  • Carbs: 11.8 g
  • Fiber: 4.4 g
  • Protein: 3.5 g

Scientific Fact: Weighing and Counting works best. Do drop us a line if you looked for the number of calories in a food product and we don’t have it listed. We would be more than happy to put it up along with other variations on Onions Welsh Raw.

Please remember that ALL diets rely on CALORIES IN – CALORIES OUT. Some diets will appeal more or motivate more but the bottom line is any advantage is really tiny and not worth considering  So choose anything that’s reasonably healthy and you think you can stick with it. We hope you visit again for more calorie counting! … and good luck with maintaining a healthy balanced diet that benefits from counting the calories.


There are 27 calories in 100g of red onion

Nutrition in 100g of red onion

  • Calories: 27
  • Fat: 0.4 g
  • Carbs: 6.5 g
  • Fiber: 2.4 g
  • Protein: 1.9 g

There are 5.3 calories in 1 slice of or wedge red onion (20g)

Nutrition in 1 slice of or wedge red onion

  • Calories: 5.3
  • Fat: 0.1 g
  • Carbs: 1.3 g
  • Fiber: 0.5 g
  • Protein: 0.4 g

There are 24 calories in 1 small red onion (91g)

Nutrition in 1 small red onion

  • Calories: 24
  • Fat: 0.4 g
  • Carbs: 5.9 g
  • Fiber: 2.2 g
  • Protein: 1.7 g

There are 27 calories in 100g of red onion

Nutrition in 100g of red onion

  • Calories: 27
  • Fat: 0.4 g
  • Carbs: 6.5 g
  • Fiber: 2.4 g
  • Protein: 1.9 g

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