1 Teaspoon Sugar Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 teaspoon (4g), 4g; per 100 g: 100g net carbs, 400 cal. Net carbs = total carbs − fiber − sugar alcohols — do the math for any label with the free net carbs calculator.
How many carbs are in 1 teaspoon sugar?
1 Teaspoon Sugar — 1 teaspoon (4g), 4g — has 4g net carbs: 4g total carbs minus 0g fiber, plus 0g protein, 0g fat, and 16 calories. Per 100g that is 100g net carbs (100g total carbs, 0g fiber) and 400 calories. That makes 1 teaspoon sugar high in net carbs and higher than the typical snacks and sweet, which averages about 55.0g net carbs per 100g. With this carb count, 1 teaspoon sugar fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per 100 g, sourced from Manufacturer-reported values; net carbs are computed by CarbMeNot.
Is 1 teaspoon sugar keto-friendly?
Yes, 1 teaspoon sugar can fit a keto diet in moderate portions. 1 teaspoon (4g), 4g is 4g net carbs (4g total carbs − 0g fiber); per 100g that is 100g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other snacks and sweets and meals.
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Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 teaspoon (4g) | 4g | 4g | 0g | 16 |
| 100 g (3.5 oz) | 100g | 100g | 0g | 400 |
| 1 oz (28 g) | 28g | 28g | 0g | 112 |
How many calories are in 1 teaspoon sugar?
1 Teaspoon Sugar — 1 teaspoon (4g), 4g — has 16 calories, with 0g protein, 0g fat, and 4g net carbs. Per 100g: 400 calories and 100g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 400 |
| Total carbs | 100g |
| Net carbs | 100g |
| Fiber | 0g |
| Sugar | 100g |
| Sugar alcohols | 0g |
| Protein | 0g |
| Fat | 0g |
| Sodium | 0mg |
| Potassium | 0mg |
Source: Manufacturer-reported values (other). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in 1 teaspoon sugar?
- 1 Teaspoon Sugar (1 teaspoon (4g), 4g) has 4g of total carbs and 4g of net carbs. Per 100 grams: 100g total, 100g net.
- How many net carbs are in 1 teaspoon sugar?
- 1 Teaspoon Sugar has 4g of net carbs per 1 teaspoon (4g), 4g — 4g total carbs minus 0g fiber.
- Is 1 teaspoon sugar keto-friendly?
- Yes, 1 teaspoon sugar can fit a keto diet in moderate portions. 1 teaspoon (4g), 4g is 4g net carbs (4g total carbs − 0g fiber); per 100g that is 100g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other snacks and sweets and meals.
- How many calories are in 1 teaspoon sugar?
- 1 Teaspoon Sugar (1 teaspoon (4g), 4g) has 16 calories; that is 400 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.