Sugar (1 tsp) Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 tsp (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 sugar (1 tsp)?
Sugar (1 tsp) — 1 tsp (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 sugar (1 tsp) 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, sugar (1 tsp) 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 sugar (1 tsp) keto-friendly?
Yes, sugar (1 tsp) can fit a keto diet in moderate portions. 1 tsp (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 tsp | 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 sugar (1 tsp)?
Sugar (1 tsp) — 1 tsp (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 sugar (1 tsp)?
- Sugar (1 tsp) (1 tsp, 4g) has 4g of total carbs and 4g of net carbs. Per 100 grams: 100g total, 100g net.
- How many net carbs are in sugar (1 tsp)?
- Sugar (1 tsp) has 4g of net carbs per 1 tsp (4g) — 4g total carbs minus 0g fiber.
- Is sugar (1 tsp) keto-friendly?
- Yes, sugar (1 tsp) can fit a keto diet in moderate portions. 1 tsp (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 sugar (1 tsp)?
- Sugar (1 tsp) (1 tsp, 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.