How much potassium is in banana?

422 milligrams of potassium in 1 medium (7 inch to 7-7/8 inch long)

Potassium in other portions of banana
Portion	Potassium
1 cup, mashed	806 milligrams of potassium in 1 cup, mashed
1 cup, sliced	537 milligrams of potassium in 1 cup, sliced
1 small (6 inch to 6-7/8 inch long)	362 milligrams of potassium in 1 small (6 inch to 6-7/8 inch long)
1 large (8 inch to 8-7/8 inch long)	487 milligrams of potassium in 1 large (8 inch to 8-7/8 inch long)
1 extra large (9 inch or longer)	544 milligrams of potassium in 1 extra large (9 inch or longer)
1 serving	451 milligrams of potassium in 1 serving
100 g	358 milligrams of potassium in 100 g

See everything in a serving of Banana, raw

Where these numbers come from

USDA FoodData Central, SR Legacy, record 173944. The source describes it as: Bananas, 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).