Blueberries are a favorite fruit for anyone tracking carbohydrates, but their carb count changes depending on how you eat them: fresh, frozen, or dried. This calculator lets you turn any serving size into grams, then shows total carbs, fiber, sugar, and net carbs for that portion. You also get the carbs per 100g figure, which is the standard reference used on nutrition labels and in food databases.
Fresh raw blueberries contain roughly 14.5g of total carbohydrate per 100g, including about 2.4g of fiber, so net carbs are around 12.1g. Dried blueberries are much denser, with about 79g of carbs per 100g. If you use a different product, switch to custom mode and enter values from your own nutrition label. The step-by-step breakdown makes it easy to see exactly how each number is calculated.
📊 Carb Results
🧮 Step-by-step breakdown
How to Use This Calculator
The calculator works with any serving size and several common units. First, choose the blueberry form that matches what you are eating. Fresh and frozen unsweetened blueberries have nearly identical macronutrient values, while dried blueberries are much more carbohydrate-dense. Next, enter the amount and pick a unit: grams, ounces, US cups, or whole berries. If you have a specific package with slightly different values, choose Custom values from label and type the figures from the nutrition panel into the three advanced fields.
- Select a blueberry type from the dropdown.
- Enter the serving amount and choose the matching unit.
- Click Calculate carbs to see total carbs, net carbs, fiber, sugar, carbs per 100g, and the full step-by-step breakdown.
- Use the quick-fill buttons to load common serving sizes such as a handful, half cup, or full cup.
The Numbers Behind the Calculation
Carbohydrate values on nutrition labels are expressed per 100 grams, so the first step is to convert your serving to grams. Once the serving is in grams, the calculator applies the standard proportion: total carbs = grams × (carbs per 100g ÷ 100). Fiber is calculated the same way using the fiber-per-100g value, and net carbs are simply total carbs minus fiber.
Total carbs = serving grams × carbs per 100g ÷ 100
Net carbs = total carbs − fiber
Sugar = serving grams × sugar per 100g ÷ 100
For example, one cup of fresh blueberries equals about 148 grams. At 14.5g of carbs per 100g, that cup provides roughly 21.5g of total carbohydrates. Subtract 3.6g of fiber and the net carb value is about 17.9g. The calculator performs these steps automatically and shows each one in the breakdown panel.
Worked Examples
Example 1: Fresh blueberries by weight. You put 85g of fresh blueberries on your oatmeal. Total carbs = 85 × 14.5 ÷ 100 = 12.33g. Fiber = 85 × 2.4 ÷ 100 = 2.04g. Net carbs = 12.33 − 2.04 = 10.29g.
Example 2: Whole-berry count. You snack on 40 berries. At roughly 1.8g per berry, that is 72g of fruit. Total carbs ≈ 10.44g, fiber ≈ 1.73g, and net carbs ≈ 8.71g.
Example 3: Dried blueberries. A 40g handful of sweetened dried blueberries contains about 40 × 79.2 ÷ 100 = 31.68g of carbs, 2.68g of fiber, and 29.0g of net carbs — far more than the same weight of fresh fruit.
Reference Values per 100g
The table below shows typical values used by the calculator. They are based on USDA FoodData Central entries for common commercial blueberry products.
| Type | Total carbs | Fiber | Net carbs | Sugar |
|---|---|---|---|---|
| Fresh raw blueberries | 14.5 g | 2.4 g | 12.1 g | 10.0 g |
| Frozen unsweetened | 14.5 g | 2.4 g | 12.1 g | 10.0 g |
| Dried, sweetened | 79.2 g | 6.7 g | 72.5 g | 65.3 g |
Why Net Carbs Matter on Low-Carb Plans
Low-carb and ketogenic diets often use net carbs rather than total carbs because dietary fiber is not fully digested and does not raise blood glucose the same way as digestible carbohydrates. Blueberries contain both insoluble and soluble fiber, roughly 2.4g per 100g. If you are counting total carbs on a standard diet, use the total carb figure. If you follow a net-carb approach for keto or diabetes management, the net carb figure is usually the more practical one. Always pair these numbers with portion control: it is easy to eat multiple handfuls, and cups can be packed differently depending on berry size.
Factors That Affect Accuracy
- Variety and ripeness. Different blueberry cultivars and riper berries can vary by a few percent in sugar content.
- Moisture. Frozen blueberries lose some water weight; a cup of frozen berries may weigh less than a cup of fresh ones.
- Added ingredients. Sweetened dried blueberries often have sugar coatings, which raises carbs and sugar well above plain dried fruit.
- Measuring method. Weights from cups are averages. A kitchen scale gives the most accurate grams for any blueberry product.
Frequently Asked Questions
- Are blueberries allowed on a keto diet?
- In moderation. A 70g serving of fresh blueberries provides about 10.1g of total carbs and 8.4g of net carbs, so a small portion can fit into many low-carb daily budgets without derailing ketosis.
- Why do dried blueberries have so many more carbs per 100g than fresh?
- Drying removes water and concentrates the natural sugars. Sweetened dried blueberries also contain added sugar, further increasing the carbohydrate density.
- Should I count total carbs or net carbs?
- It depends on your dietary approach. Standard calorie tracking usually counts total carbs, while keto plans commonly subtract fiber to get net carbs. Check with your dietitian or doctor if you are managing diabetes.
- Is 1 cup of blueberries always 148 grams?
- No. The 148g figure is a common USDA approximation for a US measuring cup of fresh blueberries. Berry size and packing affect the actual weight, so weigh your serving for more precise logging.
Values used here are based on USDA FoodData Central records. You can look up the full nutrient profiles for raw and dried blueberries at the USDA FoodData Central website.