Half a Watermelon Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per ½ watermelon (about 2.3 kg edible), 2260g; 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.
How many carbs are in half a watermelon?
Half a Watermelon — ½ watermelon (about 2.3 kg edible), 2260g — has 160.5g net carbs: 169.5g total carbs minus 9g fiber, plus 13.6g protein, 2.3g fat, and 678 calories. Per 100g that is 7.1g net carbs (7.5g total carbs, 0.4g fiber) and 30 calories. That makes half a 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, half a 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 USDA FoodData Central; net carbs are computed by CarbMeNot.
Is half a watermelon keto-friendly?
Half a Watermelon is generally not keto-friendly. ½ watermelon (about 2.3 kg edible), 2260g is 160.5g net carbs (169.5g total carbs − 9g 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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Watermelon by portion (USDA)
USDA's reference melon is 15 in long × 7.5 in across with about 4.5 kg of edible flesh; supermarket melons run from ~3 kg (small) to ~6 kg (large), so scale the half-melon row up or down accordingly:
| Item | Serving | Calories | Net carbs | Total carbs | Protein | Fat |
|---|---|---|---|---|---|---|
| 1 cup, diced | 1 cup (152 g) | 46 | 10.9g | 11.5g | 0.9g | 0.2g |
| 1 wedge (about 1/16 of a melon) | 1 wedge (286 g) | 86 | 20.5g | 21.6g | 1.7g | 0.4g |
| Half of a small melon (~1.5 kg flesh)computed | ½ small melon (1500 g) | 450 | 107g | 113g | 9.2g | 2.3g |
| Half of a typical melonUSDA reference melon ÷ 2 | ½ melon (2259 g) | 678 | 161.6g | 170.6g | 13.8g | 3.4g |
| Half of a large melon (~3 kg flesh)computed | ½ large melon (3000 g) | 900 | 214g | 226g | 18.3g | 4.5g |
| Whole reference melon | 1 melon (4518 g) | 1355 | 323g | 341g | 27.6g | 6.8g |
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| ½ watermelon (about 2.3 kg edible) | 160.5g | 169.5g | 13.6g | 678 |
| 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 half a watermelon?
Half a Watermelon — ½ watermelon (about 2.3 kg edible), 2260g — has 678 calories, with 13.6g protein, 2.3g fat, and 160.5g 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 half a watermelon?
- Half a Watermelon (½ watermelon (about 2.3 kg edible), 2260g) has 169.5g of total carbs and 160.5g of net carbs. Per 100 grams: 7.5g total, 7.1g net.
- How many net carbs are in half a watermelon?
- Half a Watermelon has 160.5g of net carbs per ½ watermelon (about 2.3 kg edible), 2260g — 169.5g total carbs minus 9g fiber.
- Is half a watermelon keto-friendly?
- Half a Watermelon is generally not keto-friendly. ½ watermelon (about 2.3 kg edible), 2260g is 160.5g net carbs (169.5g total carbs − 9g 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 half a watermelon?
- Half a Watermelon (½ watermelon (about 2.3 kg edible), 2260g) has 678 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.