Watermelon calories
1 slice · 300 g: about 80–100 kcal. 30 kcal per 100 g: 0.6 g protein, 7.6 g carbohydrate, 0.2 g fat.

In portions
| Portion | Amount | Calories |
|---|---|---|
| 1 slice | 300 g | 80–100 kcal |
Nutrition facts (100 g)
| Energy | 30 kcal |
|---|---|
| Protein | 0.6 g |
| Carbohydrate | 7.6 g |
| Sugar | 6.2 g |
| Fiber | 0.4 g |
| Fat | 0.2 g |
| Saturated fat | 0 g |
| Sodium | 1 mg |
Where the calories come from: protein 7% · carbohydrate 89% · fat 4%.
Source: USDA FoodData Central record 167765. The same food can vary by ±10% with its variety, recipe and brand.
Frequently asked questions
Watermelon: how many grams and calories in 1 slice?
1 slice is about 300 g on average and has about 80–100 kcal.
Watermelon: how many calories in 100 grams?
Per 100 g there are 30 kcal, 0.6 g of protein, 7.6 g of carbohydrate and 0.2 g of fat.
Watermelon: does it make you gain weight?
No single food makes you gain weight on its own; your weight depends on the day’s total calories. 1 slice (300 g) has about 90 kcal: about 5% of a 2,000 kcal day (the reference on nutrition labels). Its energy density is very low (0.3 kcal per gram): you can eat more of it for the same calories. Most of its calories come from carbohydrate.
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Similar foods
Among fruits, it is one of the lightest: 30 kcal per 100 g (average 101 kcal).