how many grams in a cup of blueberries?

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things people ask

• Why does my cup of blueberries weigh less than 156 g sometimes?
  Berry size is the main reason. Wild or lowbush blueberries are tiny and pack tighter, often pushing a cup past 160 g, while large cultivated berries leave more air gaps and can come in closer to 140 g. Stem caps, surface moisture from rinsing, and whether you shake the cup to settle the fruit all swing the number a few grams in either direction.
• Should I toss blueberries with flour before folding into a cup-measured batter?
  Yes, especially for muffins and quick breads where a full cup of berries is heavy enough to sink. A tablespoon of flour from the recipe's total, tossed with the rinsed and dried berries, gives the skins something to grip the batter and keeps the fruit suspended through the bake. Skip this with frozen berries you haven't thawed — the flour just clumps.
• Can I swap a cup of frozen blueberries for fresh in the same recipe?
  By weight, mostly yes — a cup of frozen blueberries runs about 140-150 g because ice crystals hold the berries apart. The bigger issue is bleeding: frozen berries release purple juice into batter as they thaw, which can streak a muffin or thin a pie filling. Fold them in straight from the freezer and add an extra minute or two of bake time.

related conversions

• Blueberries: tablespoons to grams
• Blueberries: teaspoons to grams
• Blueberries guide