how many grams in a cup of flaxseed?

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conversion reference

things people ask

• Why does my whole-seed cup weigh slightly less than my ground-flax cup?
  Whole flaxseeds are smooth and slippery, so they settle into a cup with small air gaps between the seeds. Freshly ground flax is fluffier and traps more air on the way in, but it compacts faster as it sits. Both end up close to 140 g when spooned and leveled, but a tightly packed cup of ground flax can climb to 150 g while a loose cup of whole seed may dip to 130 g.
• Can I substitute a cup of ground flax for a cup of flour in bread?
  Not at full swap. Ground flax has no gluten and absorbs roughly three times its weight in water, so replacing a whole cup of flour will give you a dense, gummy crumb. The usual ceiling is a quarter of the flour by weight — so up to about 35 g of ground flax in place of 35 g of flour per 140 g cup — and you may need to add a tablespoon of extra liquid to balance the absorption.
• Should I store a cup of pre-ground flax or grind as I go?
  Grinding as you go is better for flavor and shelf life. Flaxseed oil oxidizes quickly once the hull is broken, and a cup of pre-ground meal left at room temperature can turn fishy within a few weeks. If you do grind a cup ahead, refrigerate it in a sealed jar and use within a month, or freeze it for up to six. Whole seeds keep a year in the pantry.

related conversions

• Flaxseed: tablespoons to grams
• Flaxseed: teaspoons to grams
• Flaxseed guide