A cup of fresh blueberries contains about 84 calories, making them one of the lower-calorie snacks you can reach for but slightly higher in calories than most other berries. That cup also delivers roughly 3.6 grams of fiber and 15 grams of natural sugar, so the calorie count comes packaged with genuine nutritional value.
Calories by Serving Size
Most nutrition labels and databases base blueberry data on a half-cup or full-cup measurement. A half cup (about 74 grams) comes in at around 42 calories. A full cup (roughly 148 grams) lands at 84 calories. If you’re weighing your food, that works out to approximately 57 calories per 100 grams.
These numbers apply to fresh, raw blueberries. Dried blueberries are a different story entirely. The drying process removes water, concentrating both sugar and calories into a much smaller volume. A quarter cup of dried blueberries can easily exceed 100 calories, so if you’re tracking intake, treat dried and fresh as completely separate foods.
Wild vs. Cultivated Blueberries
The large, plump blueberries you find at most grocery stores are cultivated highbush varieties. Wild (lowbush) blueberries are smaller, more intensely flavored, and typically sold frozen. Calorie-wise, wild blueberries are slightly lower: about 45 calories per 140-gram serving compared to roughly 84 per cup for cultivated varieties. The difference comes down to size and water content.
Where wild blueberries really stand out is in their concentration of anthocyanins, the plant compounds responsible for their deep blue-purple color. Because wild berries are smaller, they have a higher skin-to-flesh ratio, and the skin is where those compounds live. Wild blueberries also contain about 6 grams of fiber per 140-gram serving, slightly more than their cultivated counterparts. Frozen wild blueberries retain these nutrients well, so fresh isn’t necessarily better.
How Blueberries Compare to Other Berries
Blueberries sit in the middle of the berry calorie range. Here’s how a cup of common berries stacks up:
- Strawberries (1 cup, whole): 46 calories
- Cranberries (1 cup, raw): 46 calories
- Raspberries (1 cup): 64 calories
- Blueberries (1 cup): 84 calories
- Grapes (1 cup): 104 calories
Strawberries and cranberries have the fewest calories per cup, largely because they contain more water. Blueberries have more natural sugar than raspberries or strawberries, which accounts for the calorie difference. That said, the gap between any of these is small enough that personal preference should drive your choice rather than calorie math.
Sugar, Fiber, and Blood Sugar
Fifteen grams of sugar in a cup of blueberries might sound like a lot, but context matters. Blueberries have a glycemic index of about 40, which falls in the low category (anything under 55 is considered low). That means they raise blood sugar gradually rather than causing a sharp spike. The fiber content plays a role here: it slows digestion and helps your body absorb the sugar more steadily.
For comparison, white bread has a glycemic index around 75 and a banana sits near 51. Blueberries are gentler on blood sugar than many foods people consider healthy, which makes them a reasonable choice even if you’re watching your carbohydrate intake.
Blueberries and Fullness
One practical question behind a calorie search is whether blueberries are filling enough to be worth eating as a snack. At 84 calories a cup, they’re relatively low in energy density, meaning you get a decent volume of food for few calories. The fiber helps: 3.6 grams per cup contributes to feelings of fullness.
Research from the University of Maine tested how blueberry-based meals affected satiety and found that the fullness response varied by body weight. Participants with higher BMIs reported feeling more satisfied and full after blueberry test meals than those with lower BMIs. The study didn’t find significant effects on blood sugar or insulin levels from the test meals, suggesting blueberries are a relatively neutral food metabolically while still contributing to a sense of satisfaction.
Pairing blueberries with a protein or fat source, like yogurt or a handful of nuts, will keep you fuller longer than eating them on their own. The berries add volume and sweetness without many calories, while the protein and fat handle the lasting satiety.