How much potassium is in watermelon?

170 milligrams of potassium in 1 cup, diced

Potassium in other portions of watermelon
Portion	Potassium
1 cup, balls	172 milligrams of potassium in 1 cup, balls
1 melon (15 inch long x 7-1/2 inch across)	5,060 milligrams of potassium in 1 melon (15 inch long x 7-1/2 inch across)
1 wedge (about 1/16 of melon)	320 milligrams of potassium in 1 wedge (about 1/16 of melon)
1 serving	314 milligrams of potassium in 1 serving
100 g	112 milligrams of potassium in 100 g

See everything in a serving of Watermelon, raw

Where these numbers come from

USDA FoodData Central, SR Legacy, record 167765. The source describes it as: Watermelon, raw.

U.S. Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center. FoodData Central. [Internet]. [cited 11 October 2026]. Available from https://fdc.nal.usda.gov/. Releases used: Foundation Foods, April 2026; SR Legacy, April 2018; Survey Foods (FNDDS 2021-2023), October 2024.

Data built on 11 October 2026 (data-2026-10-11).