The Quick Answer
Blueberries contain 12.1g net carbs per 100g and 57 calories. Net carbs are calculated by subtracting 2.4g of dietary fiber from 14.5g of total carbohydrates. At this level, blueberries are moderate in carbs — fine for low-carb diets, but portion size matters on strict keto.
All nutrition data is sourced from the USDA FoodData Central database using raw, fresh blueberry values.
Are Blueberries Keto Friendly?
It depends on how much you eat. A ¼ cup (36g) has just 4.3g net carbs — that fits comfortably within a strict keto limit. A full cup (148g) at 17.9g net carbs uses nearly a full day's keto budget. Blueberries are one of the better fruits for keto when portioned carefully.
Net carbs are what matter on a ketogenic or low-carb diet — not total carbs. Use our Keto Macro Calculator to find your personal daily limit, or our GLP-1 + Keto Calculator if you're combining blueberries with Ozempic or Wegovy.
Blueberries by Serving Size
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How Net Carbs Are Calculated
Net carbs = Total Carbs − Dietary Fiber. For blueberries: 14.5g − 2.4g = 12.1g net carbs per 100g. Fiber is subtracted because it passes through the digestive system unabsorbed and does not raise blood sugar or trigger an insulin response. Only net carbs affect ketosis.
Frequently Asked Questions
Nutrition data sourced from USDA FoodData Central. Values are for raw, fresh blueberries.