Carbs in Watermelon
Keto-friendlyHow many carbs are in watermelon?
Watermelon has 7.1g net carbs per 100g — 7.1g total carbs minus 0g fiber — plus 0.5g protein, 0.3g fat, and 31 calories. 1 cup diced (152g) works out to about 10.8g net carbs and 47 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 per 100 g, sourced from Open Food Facts; net carbs are computed by CarbMeNot.
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Last updated June 10, 2026 · Reviewed by Jordan Lee, Nutrition Editor
Values per 100 g.
Is watermelon keto-friendly?
Yes, watermelon can fit a keto diet in moderate portions. It has 7.1g net carbs per 100g (7.1g total carbs − 0g fiber). A typical serving — 1 cup diced (152g) — is about 10.8g 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 | 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 has 31 calories per 100g. 1 cup diced (152g) has about 47 calories. That's alongside 0.5g protein, 0.3g fat, and 7.1g net carbs per 100g.
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 has 7.1g of total carbs and 7.1g of net carbs per 100 grams.
- How many net carbs are in watermelon?
- Watermelon has 7.1g of net carbs per 100 grams (total carbs 7.1g minus 0g fiber).
- Is watermelon keto-friendly?
- Yes, watermelon can fit a keto diet in moderate portions. It has 7.1g net carbs per 100g (7.1g total carbs − 0g fiber). A typical serving — 1 cup diced (152g) — is about 10.8g 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 watermelon?
- Watermelon has 31 calories per 100 grams.
- How many carbs are in 1 cup diced of watermelon?
- 1 cup diced of watermelon (152g) has about 10.8g net carbs, 10.8g total carbs, and 47 calories.
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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.