Calories in Granola Bars. The favorite choice for the term Granola Bars is 1 Soft Granola Bar which has about 120 calories. Calorie and nutritional information for a variety of types and serving sizes of Granola Bars is shown below. View other nutritional values (such as Carbs or Fats) using the filter below: Calories|Total Carbs|Total Fats|Protein|Sodium|Cholesterol|Vitamins.