Is sugar keto?
With 1 tsp (4.2 g), sugar contains 4.2 g net carbs, so it works in measured portions.
- Net carbohydrate count
- Grams: 4.2 g
- Total carbohydrate
- Grams: 4.2 g
- Fiber
- Amount: 0 g
- Protein
- Amount: 0 g
- Fat
- Amount: 0 g
- Calories
- Calories: 16 kcal
For a 20 g keto day, this is 21%

Sweeteners and treats with fewer carbs
| Food | Serving | Net carbs (g) |
|---|
Sugar in a keto diet
Each 1 tsp (4.2 g) serving of sugar includes 4.2 g net carbs, equal to 21% of a 20 g keto day.
Sugar works in measured portions at 4.2 g per serving: 4 servings would use the full 20 g daily limit.
Each sugar serving includes 16 kcal, with 0 g protein and 0 g fat.
Try splenda when you want fewer carbs than sugar: each 1 packet (1 g) contains 0.9 g net carbs.
Nutrition information from USDA FoodData Central: granulated sugars (FDC 169655)