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How Much Does an onion Weigh?
An onion weighs about 110 g (medium — 3.9 oz)
Based on Onions, raw — USDA FoodData Central (FDC #170000).
| Size | Grams | Ounces |
|---|---|---|
| Small | 70 g | 2.5 oz |
| Medium | 110 g | 3.9 oz |
| Large | 150 g | 5.3 oz |
How many onions in a pound (and a kilo)?
| Amount | Number of onions |
|---|---|
| In 1 pound (454 g) | ≈ 4 onions |
| In 1 kilogram | ≈ 9 onions |
| In 1 cup (chopped) | 160 g |
Counts are approximate — produce is sold by weight, not by size, so a pound can hold a few more small onions or fewer large ones.
About onion weight
Onion size is graded by diameter, and the weight gap is wide: the USDA medium onion is 110 g, a small 70 g, and a large 150 g. Since recipes rarely say which, “one onion” can more than double the allium in a dish. Reach for the baseball-sized medium unless you want it forward. (Source: USDA FoodData Central.)
Need cups and grams instead of whole onions? See the volume ↔ weight converter for chopped onion and other prep.
Onion weight — FAQs
How much does an onion weigh?
An onion (medium) weighs about 110 grams (3.9 oz), based on USDA FoodData Central.
How many onions are in a pound?
About 4, since a pound is 454 grams and an medium onion weighs roughly 110 g. Smaller onions pack more per pound.
How many grams of onion are in a cup?
One cup of chopped onion weighs about 160 grams (USDA FoodData Central). This is the prepared, chopped form — whole onions vary by size.