If you’re asking about calories in 2/3 cup blueberries, the short answer is about 56 calories for raw, unsweetened blueberries.
That estimate is based on standard USDA nutrition data for 1 cup of blueberries. The exact number can vary a little depending on berry size and how tightly the cup is packed, but 2/3 cup is generally a light, low-calorie serving.
How many calories are in 2/3 cup blueberries?
A 1-cup serving of raw blueberries is typically listed at about 84 calories. Since 2/3 cup is two-thirds of that portion, it comes out to roughly 56 calories.
In practical terms, that means blueberries are a low-calorie fruit choice whether you eat them plain, add them to yogurt, or mix them into oatmeal. If your berries are sweetened, frozen in syrup, or part of a recipe, the calorie count will be higher.
Blueberries also bring fiber and vitamins
Calories are only part of the story. A 2/3 cup portion of blueberries also provides fiber, vitamin C, and helpful plant compounds called polyphenols, including anthocyanins that give blueberries their blue color.
Because blueberries are mostly water and naturally portion-friendly, they can satisfy a sweet craving without a lot of calories. That makes them useful for people trying to manage weight or simply add more fruit to their day.
What changes the calorie count?
The biggest factor is whether the blueberries are fresh, frozen, dried, or sweetened. Fresh and plain frozen blueberries are very close in calories, but dried blueberries are much more calorie-dense because the water has been removed.
Measuring also matters. A loosely filled cup may weigh less than a tightly packed cup, so if you want the most accurate count, use a food scale. For the most consistent nutrition tracking, Fitnit’s meal photo tool can help estimate portions from images instead of guessing by eye.
How 2/3 cup blueberries fits into a healthy diet
Two-thirds of a cup is a convenient snack size on its own, and it also works well as a topping or mix-in. Try it with Greek yogurt, cottage cheese, cereal, or a smoothie for extra color and nutrition.
If you’re tracking calories, remember that blueberries are often eaten with other foods. The fruit may be low in calories, but add-ins like granola, nut butter, or sweetened yogurt can raise the total quickly.
Tips
- Use a measuring cup or food scale if you want a more precise calorie count.
- Choose fresh or plain frozen blueberries to keep calories close to the standard estimate.
- Pair blueberries with protein, like yogurt or cottage cheese, for a more filling snack.
- If you log meals often, track the full dish, not just the blueberries, to avoid undercounting.
- Remember that dried or sweetened blueberries are much higher in calories per serving.
Sources
- USDA FoodData Central — U.S. Department of Agriculture
- Fruit and Vegetable Resources — CDC
- Blueberries — Harvard Health Publishing
- Nutrition and healthy eating — Mayo Clinic
- PubMed — National Library of Medicine
Frequently Asked Questions
How many calories are in 2/3 cup blueberries?
About 56 calories for raw, unsweetened blueberries.
Is 2/3 cup blueberries a lot?
No. It’s a modest serving and usually fits easily into a snack or meal.
Do frozen blueberries have the same calories?
Plain frozen blueberries are usually very close to fresh blueberries in calories.
Are blueberries good for weight loss?
They can be, because they’re low in calories and provide fiber and volume for the calories you get.
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