A single peppermint hard candy, such as a Starlight mint or Brach's Star Brites mint, contains 20 calories. One serving is three pieces, so a single serving contains 60 calories.
Peppermint hard candies have 5 grams of carbohydrates, consisting of sugars ranging from 3.3 to 3.7 grams per candy, depending on the brand.
Peppermints formulated for diabetics, such as Brach's Sugar Free Star Brites, contain 10 calories per peppermint, or 30 calories per serving. Sugar-free candies containing sugar alcohol should be eaten in moderation, as they can cause diarrhea. Sugar alcohol is considered a sugar substitute; however, it still contains calories, so dieters and diabetics should be aware of portion sizes.