Carbs in 1 Cup Watermelon
Keto-friendlyHow many carbs are in 1 cup watermelon?
1 Cup Watermelon — 1 cup, diced (152g) — has 10.8g net carbs: 11.4g total carbs minus 0.6g fiber, plus 0.9g protein, 0.2g fat, and 46 calories. Per 100g that is 7.1g net carbs (7.5g total carbs, 0.4g fiber) and 30 calories. That makes 1 cup watermelon relatively low in net carbs and lower than the typical fruit, which averages about 17.3g net carbs per 100g. With this carb count, 1 cup watermelon fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per per 100 g, sourced from USDA FoodData Central; net carbs are computed by CarbMeNot.
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Last updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 cup, diced (152g); per 100 g: 7.1g net carbs, 30 cal. Net carbs = total carbs − fiber − sugar alcohols — do the math for any label with the free net carbs calculator.
Is 1 cup watermelon keto-friendly?
Yes, 1 cup watermelon can fit a keto diet in moderate portions. 1 cup, diced (152g) is 10.8g net carbs (11.4g total carbs − 0.6g fiber); per 100g that is 7.1g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other fruits and meals.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 cup, diced | 10.8g | 11.4g | 0.9g | 46 |
| 100 g (3.5 oz) | 7.1g | 7.5g | 0.6g | 30 |
| 1 oz (28 g) | 2g | 2.1g | 0.2g | 8 |
How many calories are in 1 cup watermelon?
1 Cup Watermelon — 1 cup, diced (152g) — has 46 calories, with 0.9g protein, 0.2g fat, and 10.8g net carbs. Per 100g: 30 calories and 7.1g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 30 |
| Total carbs | 7.5g |
| Net carbs | 7.1g |
| Fiber | 0.4g |
| Sugar | 6.2g |
| Sugar alcohols | 0g |
| Protein | 0.6g |
| Fat | 0.1g |
| Sodium | 1mg |
| Potassium | 112mg |
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 1 cup watermelon?
- 1 Cup Watermelon (1 cup, diced, 152g) has 11.4g of total carbs and 10.8g of net carbs. Per 100 grams: 7.5g total, 7.1g net.
- How many net carbs are in 1 cup watermelon?
- 1 Cup Watermelon has 10.8g of net carbs per 1 cup, diced (152g) — 11.4g total carbs minus 0.6g fiber.
- Is 1 cup watermelon keto-friendly?
- Yes, 1 cup watermelon can fit a keto diet in moderate portions. 1 cup, diced (152g) is 10.8g net carbs (11.4g total carbs − 0.6g fiber); per 100g that is 7.1g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other fruits and meals.
- How many calories are in 1 cup watermelon?
- 1 Cup Watermelon (1 cup, diced, 152g) has 46 calories; that is 30 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.