An average banana weighs approximately 4 ounces without the skin and measures between 7 and 8 inches in length. This equates to approximately 118 grams and represents approximately 105 calories.
A banana contains 12 percent of the recommended daily intake of potassium and 14 percent of the recommended daily intake of fiber. Bananas are also considered excellent alternatives to sugary foods, ideal for satisfying a sweet tooth in a healthy manner. The skin of a banana is a factor in the weight when a purchase is made as bananas are generally sold by the pound. However, the skin is not normally consumed and is omitted from nutritional information.