A medium banana contains approximately 2.6 to 3.1 grams of dietary fiber. Most sources agree that an average medium banana (about 118 grams) provides around 3 grams of fiber

. The fiber in bananas includes both soluble fiber such as pectin and resistant starch, which contribute to digestive health and help moderate blood sugar levels

. The fiber content can vary slightly depending on the banana's size and ripeness, with greener bananas having more resistant starch (a type of fiber) than fully ripe ones

. Overall, bananas are a good source of fiber that can help contribute to daily fiber intake goals.