USDA FoodData Central lists raw blueberries at 57 calories per 100 grams. That makes them a very low-calorie fruit choice, especially compared with snacks that provide far fewer vitamins and much less fiber.
If you are weighing blueberries for meal prep, tracking macros, or building a weight-loss plan, the 100 g value is a useful baseline. The real-world calorie count changes with portion size, so a cup of blueberries will be higher than 100 g and a small handful will be lower.
What 57 calories per 100 g means
The USDA entry for raw blueberries is a weight-based nutrition label: 100 grams of the fruit contains 57 calories. Weight-based data is more precise than volume estimates because berry sizes vary, and a cup can pack loosely or tightly.
For practical use, 100 g is a little less than a cup of blueberries. A typical one-cup serving is about 148 g, which is why it usually lands around 84 calories. If you are logging food accurately, weighing the berries is the best option.
Blueberries' nutrition beyond calories
Blueberries are more than a low-calorie fruit. They provide carbohydrate for quick energy, plus fiber and small amounts of micronutrients such as vitamin C and vitamin K. They also contain naturally occurring plant compounds called anthocyanins, which give blueberries their blue-purple color.
That nutrient mix is one reason blueberries are often recommended as a fruit swap instead of processed snacks. You get sweetness, hydration, and a bit of fiber without adding many calories.
How to track portions accurately
If you use a phone-based tracker, weigh blueberries in grams whenever possible. Start with the USDA value of 57 calories per 100 g, then scale up or down based on your actual portion. For example, 50 g is about 29 calories, and 150 g is about 86 calories.
Visual estimates are fine when you are in a hurry, but they can drift. A kitchen scale is the most reliable way to match USDA data, especially if you are counting calories or macros closely.
Best ways to use blueberries in a healthy diet
Blueberries work well in oatmeal, Greek yogurt, smoothies, salads, and snack boxes. Because they are naturally sweet, they can reduce the need for added sugar in breakfast and dessert recipes.
If you are also training, pairing fruit with protein can improve satiety. For example, blueberries with yogurt or cottage cheese makes a more balanced snack than fruit alone. Fitnit can also help if you are building a home workout routine, since camera-based rep counting and form feedback can make it easier to stay consistent without equipment.
Tips
- Weigh blueberries in grams when you want to match USDA data exactly.
- Use 57 calories per 100 g as your baseline, then adjust for the portion you actually eat.
- Choose plain blueberries over sweetened dried blueberries or syrups, which are much more calorie-dense.
- Pair blueberries with protein or fat if you want a more filling snack.
- Freeze extra berries so they do not spoil before you use them.
Sources
- FoodData Central — USDA
- Vitamin C - Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
- Blueberries: Are they good for you? — Mayo Clinic
- Blueberries and health: A review of the evidence — PubMed
Frequently Asked Questions
Are raw blueberries really 57 calories per 100 g?
Yes. USDA FoodData Central lists raw blueberries at 57 calories per 100 grams.
How many calories are in 1 cup of blueberries?
About 84 calories for a typical 1-cup serving, since a cup is heavier than 100 g.
Are blueberries good for weight loss?
They can be, because they are low in calories and can help satisfy a sweet craving with more fiber and water than many snacks.
Should I weigh blueberries before or after washing?
For logging accuracy, weigh them after washing and draining, using the edible portion you actually eat.
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