Spring Onion converter: whole spring onions, cups, grams
A recipe says two spring onions or a quarter cup sliced but you're not sure how many stalks to trim. A medium spring onion stalk weighs about 15 g. Convert between whole stalks and sliced cups, grams, or ounces to prep exactly what you need.
Spring onion size ranges from a slim 10 g stalk to a plump 25 g one (2.5 times the weight). Setting the size below keeps three spring onions consistent whether you have spindly salad onions or fat bunching onions.
How much does a spring onion weigh?
Weight runs from about 10 g (0.35 oz) for a small spring onion up to 25 g (0.88 oz) for a large one, with a medium, or average, one at 15 g (0.53 oz).
Spring Onion substitutes
Ran out? What to use instead of spring onion →
Spring Onion converter tool
Enter an amount, pick your units, and set the size for counting whole spring onions.
Result
0.15 cupsSpring Onion Calculators & Kitchen Tools
Working with spring onion? These tools handle the jobs a converter cannot.
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Common Spring Onion conversions
Quick reference for spring onion at medium size. Switch the size in the converter above for small or large.
| spring onions | Cups (chopped) |
|---|---|
| 1 spring onion | 0.15 cups |
| 2 spring onions | 0.3 cups |
| 3 spring onions | 0.45 cups |
| 4 spring onions | 0.6 cups |
| 5 spring onions | 0.75 cups |
| 6 spring onions | 0.9 cups |
Spring Onion conversion chart
The chart below shows how whole spring onions (medium size) convert to cups, grams and ounces.
| spring onions | cups | cups (US) | g | oz | lb | kg |
|---|---|---|---|---|---|---|
| 1 spring onion | 0.15 cups | 0.16 cups (US) | 15 g | 0.53 oz | 0.03 lb | 0.02 kg |
| 2 spring onions | 0.3 cups | 0.31 cups (US) | 30 g | 1.06 oz | 0.07 lb | 0.03 kg |
| 3 spring onions | 0.45 cups | 0.47 cups (US) | 45 g | 1.59 oz | 0.1 lb | 0.05 kg |
| 4 spring onions | 0.6 cups | 0.63 cups (US) | 60 g | 2.12 oz | 0.13 lb | 0.06 kg |
| 5 spring onions | 0.75 cups | 0.78 cups (US) | 75 g | 2.65 oz | 0.17 lb | 0.08 kg |
Spring Onion varieties and best uses
The conversions above are the same whatever variety you use; the difference is what each is good for. Here is how the common spring onion varieties compare.
| Variety | Best for |
|---|---|
| Scallion (green onion) | All-purpose use raw or cooked: mild, crisp, and fresh; the standard supermarket spring onion. |
| Welsh onion (negi) | Stir-fries and cooked dishes: more pungent and heat-tolerant than common scallions. |
| Bunching onion | Asian dishes and pickling: slightly bulbous base, bold flavour, very versatile. |
Which should I pick?
For most recipes (stir-fries, salads, soups, and garnishes) a standard scallion (green onion) is the default: mild, fresh, and edible from root to tip. Welsh onions are more pungent and hold up better to heat; use them when you want stronger flavour in cooked dishes. Bunching onions have a slightly bulbous base and bolder flavour: the everyday choice in many Asian cuisines.
Frequently Asked Questions
- What is the size of a medium spring onion?
- A medium spring onion weighs about 15 g, which works out to roughly 0.15 cups (0.16 US cups) of chopped flesh. Spring onions come in a range of sizes depending on the season, variety and where they were grown, so weight and cup figures shift accordingly. Use the size selector above to match what you actually have, then read the exact conversion for any amount.
- How much does a medium spring onion weigh?
- A medium spring onion weighs about 15 g, with a small one around 10 g and a large one near 25 g. That range changes the weight of any recipe that counts spring onions by the piece, so set the size selector to match what you actually have before trusting a cup or gram figure.
- How much does an average spring onion weigh?
- An average spring onion is the same as a medium one: about 15 g. A small spring onion is lighter at around 10 g and a large one heavier at about 25 g, so the size you actually have changes the total for any recipe that counts spring onions by the piece rather than by weight.
- How much does a large spring onion weigh?
- A large spring onion weighs about 25 g, noticeably more than a medium, or average, one at 15 g or a small one at 10 g. Set the size selector to large to convert cups, grams and ounces for the bigger spring onions you actually have on the counter.
- How many grams of spring onions are in a cup?
- A cup of prepared spring onion comes to about 100 grams. Size does not move that figure, since a cup measures prepared flesh: a large spring onion and a small one fill it to the same weight. Counting whole spring onions is a different question, and the converter above answers that one by size.
- How many cups of spring onions are in 50 grams?
- 50 grams of prepared spring onion comes to about 0.5 cups. Size does not move that figure, since a cup measures prepared flesh: a large spring onion and a small one fill it to the same weight. Counting whole spring onions is a different question, and the converter above answers that one by size.
- How do I convert grams to ounces for any ingredient?
- Converting grams to ounces is pure weight maths that applies to any food, not just spring onions, so 50 grams is always 1.76 ounces. For other amounts, the weight converter at the link below handles grams, ounces, pounds, kilograms and stone in both directions. Grams to ounces converter
Related to Spring Onion
Onion
Standard onion is far stronger and denser (167 g/cup vs 100 g/cup), so start with less and add to taste. Best cooked into soups, stir-fries, and bases; for a raw garnish it is sharper than spring onion, so soak in cold water first. See our Onion converter.
Shallot
The closest swap in flavour: shallots are milder and sweeter than onion but more concentrated than spring onion (160 g/cup), so use roughly half the volume. Ideal in dressings, pan sauces, and gentle sautés where you want delicate onion notes. See our Shallot converter.
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