A one-cup serving of blueberries contains approximately 80 to 84 calories

. To break it down by weight:

• Per 100 grams, blueberries have about 57 to 58 calories

• One ounce (28 grams) contains roughly 16 calories

These variations depend on the specific variety and measurement method, but generally, blueberries are low in calories while providing dietary fiber, vitamin C, and other nutrients.