Convert Onion from Whole Onions
Use the tool below to convert onion from Whole Onions to the measurement that you need.
How much is one medium onion?
One medium onion is 0.66 cups, about 110 grams. 2 onions is 1.32 cups and 3 onions is 1.98 cups. Use the converter below for any amount.
Onion substitutes
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Onion converter tool
Enter an amount, pick your units, and set the size for counting whole onions.
Result
0.66 cupsOnion Calculators & Kitchen Tools
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Common Onion conversions
Quick reference for onion at medium size. Switch the size in the converter above for small or large.
| onions | Cups (chopped) |
|---|---|
| 1 onion | 0.66 cups |
| 2 onions | 1.32 cups |
| 3 onions | 1.98 cups |
| 4 onions | 2.63 cups |
| 5 onions | 3.29 cups |
| 6 onions | 3.95 cups |
Onion conversion chart
The chart below shows how whole onions (medium size) convert to cups, grams and ounces.
| onions | cups | cups (US) | g | oz | lb | kg |
|---|---|---|---|---|---|---|
| 1 onion | 0.66 cups | 0.69 cups (US) | 110 g | 3.88 oz | 0.24 lb | 0.11 kg |
| 2 onions | 1.32 cups | 1.38 cups (US) | 220 g | 7.76 oz | 0.49 lb | 0.22 kg |
| 3 onions | 1.98 cups | 2.06 cups (US) | 330 g | 11.64 oz | 0.73 lb | 0.33 kg |
| 4 onions | 2.63 cups | 2.75 cups (US) | 440 g | 15.52 oz | 0.97 lb | 0.44 kg |
| 5 onions | 3.29 cups | 3.44 cups (US) | 550 g | 19.4 oz | 1.21 lb | 0.55 kg |
Frequently Asked Questions
- How much is one medium onion?
- One medium onion is 0.66 cups, or 110 grams. The ratio is fixed, so 2 onions is 1.32 cups and 3 onions is 1.98 cups. Use the converter above for any amount, or the chart above for the most common quantities. Open the onion converter
- How much is one medium onion in cups?
- One medium onion is 0.66 cups. The conversion scales in a straight line, so 2 onions is 1.32 cups and 3 onions is 1.98 cups. Multiply or divide that figure to match whatever your recipe needs, or use the converter above for an exact reading at any amount.
- How much does one medium onion weigh?
- One medium onion weighs about 110 grams. A small one is about 70 grams and a large one about 150 grams, so set the size selector to match what you actually have. The converter above and the chart above cover all sizes and units for any amount.
Onion measurement options
Choose from the following measurements to convert to
Related to Onion
Shallot
Shallots are milder and sweeter than yellow onion. Use in dressings, pan sauces, and gentle stews; skip when you need the raw bite of a sharp onion. See our Shallot converter.
Spring Onion
Best raw: salsas, dressings, and garnish. Spring onion whites are much milder than yellow onion, so cook gently or you lose the allium entirely. See our Spring Onion converter.
Garlic
Mincing garlic for the same dish? Garlic cloves (2–7 g) bring pungent bite where onion brings sweet body. See cloves in items.
Radish
Want a crisp, peppery bite? Radishes (8–25 g) are sharp and crunchy, good raw in slaws or quick pickles. See our Radish converter.
Chopped Onion
Already chopping? The chopped onion converter moves straight between cups, grams, and spoons of prepped onion. See our Chopped Onion converter.
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