For fresh raw blueberries, a good rule of thumb is:

  • About 57 calories per 100 g of blueberries.
  • About 80–85 calories per 1 cup (roughly 140–150 g, a typical serving).
  • That works out to roughly 0.6 calories per gram , or around 1 calorie per berry depending on size.

Mini breakdown

  • 50 g (small handful): ~28–30 kcal.
  • 100 g (medium bowl): ~57 kcal.
  • 1 cup (148 g): ~84 kcal.

Nutritionally, blueberries are a low-calorie fruit that also provide fiber, vitamin C, and vitamin K, which is why they’re popular in many weight- conscious and health-focused diets.