Watermelon Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 cup diced (152g); per 100 g: 7.1g net carbs, 31 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 watermelon?
Watermelon — 1 cup diced (152g) — has 10.8g net carbs: 10.8g total carbs minus 0g fiber, plus 0.8g protein, 0.5g fat, and 47 calories. Per 100g that is 7.1g net carbs (7.1g total carbs, 0g fiber) and 31 calories. That makes 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, watermelon fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per 100 g, sourced from Open Food Facts; net carbs are computed by CarbMeNot.
Is watermelon keto-friendly?
Watermelon is borderline for keto — it works only in small portions. 1 cup diced (152g) is 10.8g net carbs (10.8g total carbs − 0g fiber); per 100g that is 7.1g net carbs. 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.
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Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 cup diced | 10.8g | 10.8g | 0.8g | 47 |
| 100 g (3.5 oz) | 7.1g | 7.1g | 0.5g | 31 |
| 1 oz (28 g) | 2g | 2g | 0.1g | 9 |
How many calories are in watermelon?
Watermelon — 1 cup diced (152g) — has 47 calories, with 0.8g protein, 0.5g fat, and 10.8g net carbs. Per 100g: 31 calories and 7.1g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 31 |
| Total carbs | 7.1g |
| Net carbs | 7.1g |
| Fiber | 0g |
| Sugar | 7.1g |
| Sugar alcohols | 0g |
| Protein | 0.5g |
| Fat | 0.3g |
| Sodium | 40mg |
| Potassium | 0mg |
Source: Open Food Facts (Generic). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in watermelon?
- Watermelon (1 cup diced, 152g) has 10.8g of total carbs and 10.8g of net carbs. Per 100 grams: 7.1g total, 7.1g net.
- How many net carbs are in watermelon?
- Watermelon has 10.8g of net carbs per 1 cup diced (152g) — 10.8g total carbs minus 0g fiber.
- Is watermelon keto-friendly?
- Watermelon is borderline for keto — it works only in small portions. 1 cup diced (152g) is 10.8g net carbs (10.8g total carbs − 0g fiber); per 100g that is 7.1g net carbs. 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 watermelon?
- Watermelon (1 cup diced, 152g) has 47 calories; that is 31 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.