Carbs in Cornstarch
How many carbs are in cornstarch?
Cornstarch has 90.4g net carbs per 100g — 91.3g total carbs minus 0.9g fiber — plus 0.3g protein, 0.1g fat, and 381 calories. That makes cornstarch high in net carbs and higher than the typical vegetable, which averages about 17.9g net carbs per 100g. At this carb count, cornstarch is best limited to small portions on keto (usually 20–50g net carbs per day). Values are per per 100 g, sourced from USDA FoodData Central; net carbs are computed by CarbMeNot.
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Cornstarch runs higher in carbs, so portions matter. CarbMeNot tracks every gram from a photo, so you stay under your daily limit without the math.
Last updated June 10, 2026 · Reviewed by Jordan Lee, Nutrition Editor
Values per 100 g.
Is cornstarch keto-friendly?
Cornstarch is generally not keto-friendly. It has 90.4g net carbs per 100g (91.3g total carbs − 0.9g fiber). On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 100 g (3.5 oz) | 90.4g | 91.3g | 0.3g | 381 |
| 1 oz (28 g) | 25.3g | 25.6g | 0.1g | 107 |
How many calories are in cornstarch?
Cornstarch has 381 calories per 100g. That's alongside 0.3g protein, 0.1g fat, and 90.4g net carbs per 100g.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 381 |
| Total carbs | 91.3g |
| Net carbs | 90.4g |
| Fiber | 0.9g |
| Sugar | 0g |
| Sugar alcohols | 0g |
| Protein | 0.3g |
| Fat | 0.1g |
| Sodium | 9mg |
| Potassium | 3mg |
Source: USDA FoodData Central (SR Legacy). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in cornstarch?
- Cornstarch has 91.3g of total carbs and 90.4g of net carbs per 100 grams.
- How many net carbs are in cornstarch?
- Cornstarch has 90.4g of net carbs per 100 grams (total carbs 91.3g minus 0.9g fiber).
- Is cornstarch keto-friendly?
- Cornstarch is generally not keto-friendly. It has 90.4g net carbs per 100g (91.3g total carbs − 0.9g fiber). On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
- How many calories are in cornstarch?
- Cornstarch has 381 calories per 100 grams.
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CarbMeNot provides general nutrition information, not medical advice. Values are estimates — verify before relying on them for any health decision. See our Medical Disclaimer.