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How much does an onion weigh?

Small onion = 4 ounces by weight or about ½ cup chopped.

Medium onion = 8 ounces, or about 1 cup chopped. 

Large onion = 12 ounces, or about 1½ cups chopped.

Jumbo onion = 16 ounces, or about 2 cups chopped. source. The terms are not always completely accurate so use your best judgement.