Fruit

How much fiber is in watermelon?

Watermelon has 0.6 g of fiber per 1 cup diced (152 g). That is 2% of the 28 g daily value and a low amount for a fruit. Per 100 g it works out to 0.4 g, which ranks 39 of 39 fruits in the FiberUp database. About 17% of that fiber is soluble and 83% insoluble. It would take 42 servings to reach the 25 g adequate intake for women and 64 for the 38 g for men. Source: USDA FoodData Central.

By Anthony Calise, maker of FiberUp. Data checked October 2026.

0.6g

per 1 cup diced

0.4g

per 100 g

daily value

#39of 39

fruits

Soluble vs insoluble

Soluble 0.1g 17% Insoluble 0.5g 83%

The split is approximate and comes from USDA SR Legacy analyses where available. Soluble fiber dissolves into a gel and is the type most linked to cholesterol and blood sugar effects. Insoluble fiber adds bulk and keeps things moving.

About watermelon and fiber

Watermelon is the lowest-fiber fruit in this database at 0.6 grams per cup, because it is more than 90 percent water. It is also high FODMAP from fructose.

Counts toward plant diversityHigh FODMAP at this serving

How watermelon compares to other fruits

Per typical serving. The highest fruit in the database is raspberries at 8 g.

Food	Serving	Fiber	Per 100 g	% DV
Raisins	1/4 cup	1.5 g	3.7 g	5%
Apricots	2 fresh	1.4 g	2 g	5%
Cantaloupe	1 cup cubed	1.4 g	0.9 g	5%
Grapes	1 cup	1.4 g	0.9 g	5%
Honeydew	1 cup diced	1.4 g	0.8 g	5%
Applesauce (Unsweetened)	1/2 cup	1.3 g	1.1 g	5%
Watermelon	1 cup diced	0.6 g	0.4 g	2%

All 39 fruits ranked by fiber

Servings to reach a daily goal

42×

servings of watermelon to reach 25 g, the adequate intake for adult women

64×

servings of watermelon to reach 38 g, the adequate intake for adult men

Nobody should get all their fiber from one food. Gut bacteria respond to variety, and the fiber calculator shows a mixed day that reaches your number.

USDA entries for watermelon

Grams of fiber per 100 g from USDA FoodData Central (snapshot 2026-10-11). Different preparations and varieties explain the spread.

USDA description	Fiber / 100 g	Soluble	Insoluble
Watermelon, seedless, rind only, raw	1.5 g	–	–
Watermelon, raw	0.4 g	–	–
Watermelon juice, 100%	0.4 g	–	–

Frequently asked questions

How much fiber is in watermelon?

1 cup diced of watermelon, about 152 grams, contains 0.6 grams of dietary fiber. That is 0.4 grams of fiber per 100 grams and 2% of the 28 gram daily value.

Is watermelon high in fiber?

Not especially. Watermelon has 0.6 g per serving, which ranks 39 of 39 fruits in the FiberUp database. It still counts toward plant diversity, but the fiber in a meal will come from elsewhere.

Is the fiber in watermelon soluble or insoluble?

About 17% of the fiber in watermelon is soluble (0.1 g) and 83% is insoluble (0.5 g). Soluble fiber forms a gel that slows digestion and feeds gut bacteria; insoluble fiber adds bulk and speeds transit.

How many servings of watermelon would reach a daily fiber goal?

It would take about 42 servings to reach 25 g (the adequate intake for adult women) and 64 servings to reach 38 g (adult men). Spreading fiber across several foods is easier and better for gut bacteria diversity.

Values are per typical serving from USDA FoodData Central and standard references, rounded to one decimal. Actual fiber varies with variety, ripeness, and preparation. This is general nutrition information, not medical advice.