how many grams in a cup of hazelnuts?

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things people ask

• How many hazelnuts are in a cup?
  Roughly 110-130 whole kernels, depending on size — Oregon and Turkish hazelnuts skew larger, Italian Tonda Gentile a touch smaller. At 142 g per cup, that's about 1.1-1.3 g per nut. For praline or Nutella-style spreads, you usually want them by weight rather than count, since one batch of recipe-grade hazelnuts can vary 15-20% in size.
• Can I swap hazelnut flour for all-purpose flour cup-for-cup in baking?
  Not directly. Hazelnut flour has no gluten and contains roughly 60% fat, so a 1:1 swap collapses most cake structures. In recipes built around it — financiers, Italian brutti ma buoni, flourless tortes — 1 cup of hazelnut flour runs about 100 g. For partial substitution in butter cakes, replacing 25-30% of the wheat flour by weight is a safer ceiling.
• Should I toast hazelnuts before measuring for biscotti or praline?
  Toast first if the recipe expects toasted nuts — the skins lift off after 10-12 minutes at 175°C, and rubbing them in a tea towel removes most of the tannic bitterness. A cup of toasted, skinned hazelnuts weighs slightly less than raw (around 130-135 g) because moisture and skin are gone. Weigh after toasting if the recipe is ratio-sensitive, like a praline paste.

related conversions

• Hazelnuts: tablespoons to grams
• Hazelnuts: teaspoons to grams
• Hazelnuts guide