Is Onion keto?
Keto-friendly
Yes, onion is keto-friendly. A serving (¼ cup chopped (40 g)) has about 3 g of net carbs.
The short answer
Count them. A few slices are fine, but whole onions add up.
A typical serving is ¼ cup chopped (40 g). That has 16 calories, 0.4 g protein, 0 g fat and 3 g net carbs (3.7 g total carbs − 0.7 g fiber).
How many servings fit in your carb budget?
Based on using your entire daily net-carb limit on this one food, which you would not do in practice.
Nutrition facts
Per 100 g: 40 kcal · 7.6 g net carbs · 1.1 g protein · 0.1 g fat. Estimates vary by brand and preparation.
Frequently asked questions
Is onion keto?
Yes, onion is keto-friendly. A serving (¼ cup chopped (40 g)) has about 3 g of net carbs.
How many carbs are in onion?
A serving of onion (¼ cup chopped (40 g)) has about 3.7 g of total carbohydrates and 0.7 g of fiber, which works out to roughly 3 g of net carbs. Per 100 g it has about 7.6 g of net carbs.
Can I eat onion on a keto diet?
Yes. Count them. A few slices are fine, but whole onions add up. Keep an eye on total calories, especially with calorie-dense foods.
More vegetables
Get your personal carb limit
The free keto calculator sets your daily calories, protein, fat and net carbs, then the tracker keeps score.
Skip the counting
The 28-Day Plan has every meal's macros done for you. $29, instant download.