How many carbs are in blueberries?
One cup of blueberries (140g) has about 20g of carbohydrate. That is more than most berries by cup volume, which surprises people who assume all berries are equally low in carbs.
Carbs by portion
| Portion | Total carbs | Fiber | Net carbs |
|---|---|---|---|
| 1 cup (140g) | 20.4g | 0.0g | 20.4g |
| 100 grams | 14.6g | 0.0g | 14.6g |
Net carbs
The USDA Foundation data for blueberries does not include a separate fiber value, so a precise net carb calculation is not available from this dataset. Published fiber estimates for raw blueberries run around 2 to 2.4g per 100g, which would put net carbs for a cup at roughly 17 to 18g. For a conservative count in a diabetes or keto context, use the total carb figure of 20g. See the net carbs guide for how net carbs are calculated.
Glycemic index of blueberries
The glycemic index of blueberries is about 53. Blueberries sit in the low-to-moderate GI range. Their polyphenol content may blunt the glycemic response slightly, though the total carb load per cup is still meaningful.
For diabetes
A cup of blueberries has about 20g of carbs, which is a real bolus-worthy amount. Blueberries are often marketed as a superfood for blood sugar, but the carb count matters regardless of their antioxidant profile. A half-cup portion at around 10g of carbs is a more manageable snack size for most people with diabetes. Most U.S. care teams dose on total carbs. See the diabetes carb-counting guide.
Keto and low carb
One cup of blueberries has about 20g of carbs, which is at or above a full day's strict keto budget. A quarter-cup portion at around 5g of carbs can fit, but a full cup does not work for most keto plans. Among common berries, blueberries are on the higher end for carb density.
Good to know
Fresh and plain frozen blueberries have the same carb count. Dried blueberries are a very different food: they typically run 80g or more of carbs per 100g because the water is removed and often sugar is added. Blueberry muffins, yogurts, and juices usually use concentrated blueberry flavor with added sugar, bearing little resemblance to the fresh fruit nutritionally. Wild blueberries are smaller and more tart than cultivated ones, with a similar carb profile.
Full nutrition (per 100g)
- Calories: 0 kcal
- Carbohydrate: 14.57g
- Fiber: 0g
- Sugars: n/ag
- Protein: 0.7g
- Fat: 0.31g
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Get the appFrequently asked questions
How many carbs are in blueberries?
One cup of raw blueberries (140g) has about 20g of carbohydrate. A quarter-cup serving has around 5g.
Are blueberries high in carbs compared with other berries?
Yes. Blueberries have more carbs per cup than strawberries, raspberries, or blackberries. A cup of strawberries has about 12g of carbs versus 20g for a cup of blueberries.
Are blueberries keto-friendly?
A full cup is not keto-friendly at around 20g of carbs. A small quarter-cup portion at about 5g can fit a strict keto plan, but it leaves little room for other carbs.
What is the glycemic index of blueberries?
Blueberries have a glycemic index of around 53, which is in the low-to-moderate range. The total carb load per cup is still about 20g, so portion size still matters.
Do frozen blueberries have the same carbs as fresh?
Yes, plain frozen blueberries have essentially the same carb count as fresh. Sweetened frozen blueberries add sugar and carry significantly more carbs.