how many grams in a cup of natto?

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conversion reference

things people ask

• How many grams in a cup of natto?
  Around 175 g for a packed cup, since fermented soybeans cling together rather than sit loose. The retail benchmark most home cooks know is the 40-50 g styrofoam pack — about a quarter cup each — so a full cup is roughly four packs stirred together. The stringy biofilm makes leveling pointless; press lightly to fill and weigh if a recipe needs precision.
• Do I need a full cup of natto for natto pasta?
  Most natto pasta recipes for two people use 80-100 g (two packs), not a full cup. A full 175 g cup is more typical of a family natto don served over four bowls of rice, or a stuffing for a thick rolled omelet. Scale by pack count rather than cup lines — packs are the unit Japanese recipes were written around.
• Does cooking natto destroy the nattokinase?
  Nattokinase, the fibrinolytic enzyme natto is prized for, denatures above roughly 70°C, so stir-frying or baking a full cup into a casserole inactivates it. The B12 and prebiotic fiber survive heat fine. If you want the enzyme intact, fold natto into hot rice or pasta off the heat rather than simmering it into the sauce.

related conversions

• Natto: tablespoons to grams
• Natto: teaspoons to grams
• Natto guide