What is the fiber content of a banana?

A medium-size banana approximately 8 inches long usually contains 3 grams of dietary fiber, according to Mount Sinai Health System. A banana this size delivers approximately 100 calories and is regarded as a good source of potassium and other nutrients.

Bananas are an excellent source for obtaining many essential vitamins and nutrients. According to SFGate, an average 8-inch banana can contain up to 22 percent of the required daily allotment of vitamin B-6 and 17 percent of the required vitamin C. A medium-size banana can also provide up to 12 percent of a healthy person's daily potassium and fiber intake.