Convert Onion from Cups (chopped) to Whole Onions
Use the tool below to convert onion from Cups (chopped) to Whole Onions.
How many onions are in a cup?
One cup of chopped onion needs about 1.52 medium onions. With small onions that rises to roughly 2.39, and with large onions it drops to about 1.11. Enter the cups your recipe asks for to read off how many whole onions to chop.
Related Onion Ingredients
Already chopping? The chopped onion converter moves straight between cups, grams, and spoons of prepped onion. See our Chopped Onion converter.
Need a milder, more delicate allium? Shallots (20–60 g) suit dressings and pan sauces. See our Shallot converter.
Spring onions (10–25 g) are tender and herbaceous, great raw or as a garnish. See our Spring Onion converter.
Mincing garlic for the same dish? Garlic cloves (2–7 g) bring pungent bite where onion brings sweet body. See our Garlic converter.
Want a crisp, peppery bite? Radishes (8–25 g) are sharp and crunchy, good raw in slaws or quick pickles. See our Radish converter.
Out of onion? See onion substitutes →
No measuring cups? The tool below gets you close, and a measuring cup set keeps every batch the same.
Scoop it right, get measuring cupsOnion converter tool
Enter an amount, pick your units, and set the size for counting whole onions.
Result
1.52 onionsOnion Calculators & Kitchen Tools
Working with onion? These tools handle the jobs a converter cannot.
- Oven to Air Fryer Converter Match the temperature and time when you swap the oven for an air fryer, fan oven, or slow cooker.
- Recipe Scaler Scale any recipe up or down and keep every ingredient in ratio.
Common Onion conversions
Quick reference for onion at medium size. Switch the size in the converter above for small or large.
| Cups (chopped) | onions |
|---|---|
| 0.25 cups | 0.38 onions |
| 0.5 cups | 0.76 onions |
| 0.75 cups | 1.14 onions |
| 1 cup | 1.52 onions |
| 1.5 cups | 2.28 onions |
| 2 cups | 3.04 onions |
| 3 cups | 4.55 onions |
For the reverse conversion, see what one medium onion is in cups.
Frequently Asked Questions
- How many onions make a cup?
- One medium onion (about 110 g) gives roughly 0.66 cups of chopped flesh. A small one (around 70 g) yields about 0.42 cups and a large one (around 150 g) about 0.9 cups, so set the size selector to match the onions you actually have before you trust the figure. Open onion converter
- How many onions is 2 cups?
- 2 cups of onions is about 3 medium onions. Size changes that count: with small onions it is nearer 5 and with large ones about 2, since a small onion weighs around 70 g, a medium one 110 g and a large one 150 g. Set the size selector above to match yours, then read the exact count for any amount of onion.
- How much do 3 onions weigh in cups?
- 3 medium onions weigh about 1.98 cups, since a medium onion is around 110 g. Small onions come to roughly 1.26 cups and large ones about 2.69 cups, so size moves the total. Set the size selector above to match your onion, then read the exact weight for any count.
- What is the difference between a metric and US cup?
- A metric cup holds 250 ml while a US cup holds 240 ml, so a US cup is 4% smaller. For chopped onion that gap is small but real, and it adds up across several cups. The guide linked below explains when the difference matters and how to switch between the two so a recipe lands right whichever cup you own. metric v US cup