Is onion keto?
Onion
Fine as a flavoring, but onions are sweeter than most vegetables. A medium onion has around 8 g net carbs, so measure.
Nutrition per serving
¼ cup chopped · 40 g- Net carbs
- 3.1g
- Calories
- 16kcal
- Protein
- 0.4g
- Fat
- 0g
- Total carbs
- 3.7 g
- Fiber
- 0.7 g
About 65.8 g of onion adds up to 5 g net carbs — roughly 1.6 typical servings.
| Nutrient | Per serving | Per 100 g |
|---|---|---|
| Calories | 16 kcal | 40 kcal |
| Total carbohydrate | 3.7 g | 9.3 g |
| Dietary fiber | 0.7 g | 1.7 g |
| Net carbs | 3.1 g | 7.6 g |
| Sugars | 1.7 g | 4.2 g |
| Protein | 0.4 g | 1.1 g |
| Fat | 0 g | 0.1 g |
Portion calculator
Open carb counter →- Net carbs
- – g
- Calories
- –
- Protein
- – g
- Fat
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0% of your 20 g daily net-carb limit. Personalize
If you do eat onion
-
Use ¼ cup per dish or swap in green onion tops, chives or onion powder. - Caramelized onions concentrate sugar — keep portions small.
Better keto swaps for onion
Frequently asked questions
Is onion keto?
Onion can fit keto, but only in small, measured portions. Fine as a flavoring, but onions are sweeter than most vegetables. A medium onion has around 8 g net carbs, so measure.
How many net carbs are in onion?
¼ cup chopped (40 g) of onion has about 3.1 g net carbs (3.7 g total carbs minus 0.7 g fiber). Per 100 g, that's 7.6 g net carbs.
How much onion can I eat on keto?
About 65.8 g of onion adds up to 5 g net carbs — roughly 1.6 typical servings. On a typical 20 g daily limit, one serving uses about 16% of your carbs.
What is a good keto substitute for onion?
Try green onions, onion powder, chives.
