how many grams in a cup of onions?

try a different amount

conversion reference

things people ask

• How many onions make one cup chopped?
  One medium yellow or white onion (around 6-7 oz before peeling) yields close to 1 cup chopped, or 142 g. A large onion gives 1.5-2 cups. Recipes that say '1 onion, chopped' assume medium, so when you grab a softball-sized onion from the bag, expect to use only about two-thirds of it to hit the 1-cup mark.
• Why does the recipe say 1 cup raw but the pan looks empty after cooking?
  Onions are roughly 89% water. A cup of raw chopped onion (142 g) loses most of that volume as it sweats, sautés, and especially caramelizes. Plan on a 4:1 reduction for caramelized onions — start with 4 cups raw chopped if a recipe wants 1 cup of the finished jammy version. Soups and stews mask the loss, but onion jam exposes it.
• Does dicing size change the cup measurement?
  Slightly. A loose rough chop traps more air, so a cup runs lighter — closer to 130 g. A fine, knife-pressed brunoise packs tighter and lands at 150 g or a bit more. The 142 g figure assumes a standard 1/4-inch chop, which is what most recipes mean when they don't specify. For mirepoix accuracy, weigh rather than eyeball.

related conversions

• Onions: tablespoons to grams
• Onions: teaspoons to grams
• Onions guide