Ingredient Weight Converter · vegetable
Chopped Onion: cups to grams
1 cup of chopped onion weighs 160 grams. Use the converter below for any other amount, or check the quick-reference table.
Chopped Onion baseline: 1 cup = 160 g.
Common amounts
| Cups | Tablespoons | Grams | Ounces (weight) | Milliliters |
|---|---|---|---|---|
| 1/4 cup | 4.0 | 40 g | 1.41 oz | 59 mL |
| 1/3 cup | 5.3 | 53 g | 1.88 oz | 79 mL |
| 1/2 cup | 8.0 | 80 g | 2.82 oz | 118 mL |
| 2/3 cup | 10.7 | 107 g | 3.76 oz | 158 mL |
| 3/4 cup | 12.0 | 120 g | 4.23 oz | 177 mL |
| 1 cup | 16.0 | 160 g | 5.64 oz | 237 mL |
| 1.5 cups | 24.0 | 240 g | 8.47 oz | 355 mL |
| 2 cups | 32.0 | 320 g | 11.29 oz | 473 mL |
| 3 cups | 48.0 | 480 g | 16.93 oz | 710 mL |
| 4 cups | 64.0 | 640 g | 22.58 oz | 946 mL |
Why measuring chopped onion by cup goes wrong
Medium-diced yellow onion weighs about 160 grams per cup. A medium yellow onion (about the size of a tennis ball) yields roughly 1 cup chopped. Red onions are slightly denser; sweet onions (Vidalia) are slightly less dense because they're higher in water.
Practical tips for working with chopped onion
When a recipe says '1 medium onion, chopped,' that means about 1 cup. If you only have a giant onion, chop the amount you need and refrigerate the rest in a sealed container — it keeps three days. To prevent tears, refrigerate the onion for 30 minutes before chopping; the cold slows the enzyme reaction that produces the airborne sulfur compounds.
Note from this ingredient's record: Medium dice. One medium yellow onion yields about 1 cup chopped.
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