USDA calories for raw blueberries: the 100 g number

According to USDA FoodData Central, raw blueberries contain about 57 calories per 100 grams. That 100 g amount is close to a generous handful, but it is not the same as a cup unless you weigh it; blueberries vary a bit depending on size and packing.

For context, 100 g of raw blueberries also provides roughly 14–15 g of carbohydrate, about 2–3 g of fiber, and very little fat or protein. The calorie count stays low because most of the weight comes from water and carbohydrate, not fat.

What 100 g of blueberries looks like in real portions

A common mistake is assuming one cup always equals 100 g. In reality, a cup of blueberries can weigh more or less depending on whether the berries are large, small, or tightly packed. If you are tracking intake closely, a kitchen scale is more reliable than measuring by volume.

For most people, one practical serving is about 1 cup of raw blueberries, which is often around 140–150 g. That means a typical cup usually contains more calories than 100 g, roughly in the low 80s. If you only need a rough estimate, the USDA 100 g value is still a useful anchor.

Why blueberries are a smart low-calorie fruit

Blueberries are calorie-efficient because they offer flavor, fiber, and micronutrients without much energy density. Fiber can help with fullness, and the fruit’s naturally sweet taste makes it easy to use as a substitute for higher-calorie snacks or desserts.

Blueberries are also well-known for their anthocyanins, the pigments that give them their blue-purple color. Research from NIH and published studies has linked berry intake with antioxidant activity and potential cardiovascular and metabolic benefits, though blueberries are not a cure or a substitute for overall healthy eating.

How to use the USDA number in everyday tracking

Use the 57-calorie-per-100-g figure when logging smoothies, oatmeal, yogurt bowls, or baked goods. If you are meal prepping, weigh the blueberries once, then divide by portions so your calories stay consistent.

If you use Fitnit for at-home workouts, the same attention to measurement can help outside the gym too: keeping food and activity estimates realistic makes it easier to match your intake with your training goals. For exercise, its camera-based rep counting and form feedback can help reduce guesswork without needing extra equipment.

Tips

• Weigh blueberries in grams when accuracy matters; volume measures can be inconsistent.
• Use 100 g as your baseline, then scale up or down for the amount you actually eat.
• Pair blueberries with protein or plain Greek yogurt if you want a more filling snack.
• Choose unsweetened frozen blueberries for smoothies to avoid added sugar.
• Track toppings, not just the fruit; granola, syrup, and sweetened yogurt can add far more calories than the berries.