How much fiber is in watermelon?
Watermelon has 0.6 grams of fiber in 1 cup, diced (152 grams), according to USDA FoodData Central. That is 2% of the Daily Value, below the 10% the FDA requires before a label can call a food a good source of fiber. Per 100 grams, watermelon has 0.4 grams of fiber.
0.6gof fiber in 1 cup, diced
2% of a 25 gram day
Fiber in watermelon by serving size
| Serving | Weight | Fiber |
|---|---|---|
| 10 watermelon balls | 122g | 0.5g |
| 1 cup, diced | 152g | 0.6g |
| 1 cup, balls | 154g | 0.6g |
| 1 wedge (approx 1/16 of melon) | 286g | 1.1g |
| 1 melon (15" long x 7-1/2" dia) | 4518g | 18.1g |
| 100 grams | 100g | 0.4g |
How watermelon compares with other fruits
Watermelon ranks 11 of 11 fruits in this library, by fiber in one serving.
- Orange3.1g
- Strawberries3g
- Mango2.6g
- Grapes1.4g
- Watermelon0.6g
Each bar is one serving: orange, 1 orange; strawberries, 1 cup, halved; mango, 1 cup, pieces; grapes, 1 cup; watermelon, 1 cup, diced.
Mostly water
A cup of diced watermelon has 0.6 grams of fiber, or 0.4 per 100 grams. It is one of the lowest plant foods in this library.
Enjoy it, and get fiber elsewhere
You would need about 41.7 cups to reach 25 grams. A cup of raspberries next to it adds 8 grams in one go.
More fiber alongside watermelon
- Chia seeds: 9.8 grams in 1 ounce (about 2 tablespoons)
- Oatmeal: 4 grams in 1 cup, cooked
- Almonds: 3.5 grams in 1 ounce (about 23 almonds)
Not sure what your daily number should be? The fiber calculator works it out from your age and sex.
Questions about fiber in watermelon
- How much fiber is in watermelon?
- Watermelon has 0.6 grams of fiber in 1 cup, diced, which weighs 152 grams. The number comes from USDA FoodData Central.
- Is watermelon high in fiber?
- One serving, 1 cup, diced, has 0.6 grams. That is 2% of the Daily Value, below the 10% the FDA requires before a label can call a food a good source of fiber. Watermelon ranks 11 of 11 fruits in this library by fiber per serving.
- How much fiber is in 100 grams of watermelon?
- 0.4 grams of fiber per 100 grams. The largest size USDA lists, 1 melon (15" long x 7-1/2" dia), weighs 4518 grams and has 18.1 grams of fiber.
- How many cups of watermelon would it take to reach 25 grams of fiber?
- About 41.7, at 0.6 grams each. Most people reach 25 grams by mixing several foods across the day.
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Source: USDA FoodData Central, Watermelon, raw, retrieved October 8, 2026. Label terms follow the FDA's 28 gram Daily Value for fiber.