Nutrition Flash Calories in one medium-sized Broccoli September 25, 2014September 3, 2015 0 Comment Broccoli, broccoli nutrition facts, calorie in broccoli, Health and Fitness Broccoli is a very good source of dietary fiber, pantothenic acid, vitamin B6, vitamin E, manganese, phosphorus, choline, vitamin B1, vitamin A, potassium, and copper. A medium sized head of broccoli contains 141 calories.