Convert Onion from Cups (chopped) to Ounces
Use the tool below to convert onion from Cups (chopped) to Ounces.
How many ounces is a cup of onions?
A cup of onions is about 5.89 ounces. Half that is about 2.95 ounces and double about 11.78 ounces, so the ratio scales in a straight line. Use the converter above for any amount, or the chart below for the most common quantities.
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
5.89 ozOnion 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) | Ounces |
|---|---|
| 0.25 cups | 1.47 oz |
| 0.5 cups | 2.95 oz |
| 0.75 cups | 4.42 oz |
| 1 cup | 5.89 oz |
| 1.5 cups | 8.84 oz |
| 2 cups | 11.78 oz |
| 3 cups | 17.67 oz |
For the reverse conversion, see what an ounce of onions is in cups.
Frequently Asked Questions
- How many ounces is a cup of onions?
- A cup of onions is about 5.89 ounces of onion. The density of chopped onion is fixed, so the ratio holds at any amount: double the cups and you double the ounces. Use the converter above for any quantity, or the chart above for the most common amounts. Open the onion converter
- How many ounces is 2 cups of onions?
- 2 cups of onions is about 11.78 ounces. The ratio is fixed, so a cup of onions is 5.89 ounces and the figure scales in a straight line as you multiply or divide. Scaling a recipe up or down keeps the same proportion, so work from whichever amount your recipe lists. Use the converter above for any other quantity of onion.
- How many cups of onions is 5.89 ounces?
- 5.89 ounces of onions is about 1 cup. The conversion works the same in reverse, so you can switch between cups and ounces without changing the result. This helps when a recipe lists one unit but you would rather measure the other. Use the converter above for any amount.
- 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