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Onion, diced — Cups to Grams

One US cup of diced onion weighs about 142 grams. That makes it heavier than all-purpose flour, which is 120 grams per cup. One medium yellow onion yields close to one cup diced — about 142 grams. Use the converter below to switch diced onion between cups, grams, ounces, tablespoons and millilitres — or read the full chart underneath.

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Diced onion conversion chart

Diced onion — cups to grams chart
Cups	Grams	Ounces	Tablespoons	Millilitres
⅛ cup	17.75 g	0.626 oz	2	29.57 ml
¼ cup	35.5 g	1.25 oz	4	59.15 ml
⅓ cup	47.33 g	1.67 oz	5.33	78.86 ml
½ cup	71 g	2.5 oz	8	118.3 ml
⅔ cup	94.67 g	3.34 oz	10.67	157.7 ml
¾ cup	106.5 g	3.76 oz	12	177.4 ml
1 cup	142 g	5.01 oz	16	236.6 ml
1¼ cups	177.5 g	6.26 oz	20	295.7 ml
1½ cups	213 g	7.51 oz	24	354.9 ml
2 cups	284 g	10.02 oz	32	473.2 ml
3 cups	426 g	15.03 oz	48	709.8 ml

Grams to cups: diced onion

Diced onion — grams to cups chart
Grams	Cups	Ounces	Tablespoons
10 g	0.07	0.353 oz	1.13
25 g	0.176	0.882 oz	2.82
50 g	0.352	1.76 oz	5.63
75 g	0.528	2.65 oz	8.45
100 g	0.704	3.53 oz	11.27
125 g	0.88	4.41 oz	14.08
150 g	1.06	5.29 oz	16.9
200 g	1.41	7.05 oz	22.54
250 g	1.76	8.82 oz	28.17
300 g	2.11	10.58 oz	33.8
400 g	2.82	14.11 oz	45.07
500 g	3.52	17.64 oz	56.34

How to measure diced onion

One medium yellow onion yields close to one cup diced — about 142 grams.

Because a cup measures volume rather than weight, the most reliable way to measure diced onion is with a digital kitchen scale. If you are working from cups, keep your technique consistent every time so your results are repeatable. For more, see our guide on baking by weight versus volume.

No scale yet? You don't need a fancy one; any digital kitchen scale that reads in 1-gram steps does everything on this site. Well-rated kitchen scales on Amazon →

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Substitutes for diced onion

Equal volume chopped leek, white and light-green parts only (soups, sautés, quiches) (A Couple Cooks)
Milder, sweeter result. Rinse thoroughly before slicing — leeks trap grit.
Two shallots per medium onion (sauces, vinaigrettes, delicate dishes) (The Kitchn)
Shallots are milder and sweeter; use roughly 2:1 by volume to match onion intensity.

See all diced onion substitutes, ratios and sources →

Compare diced onion

Onion, diced vs Shallots, minced

Diced onion conversions: FAQ

Why doesn't a cup of diced onion weigh the same as a cup of water?

A cup measures volume, not weight. Diced onion is less dense than water (142 g versus 237 g per cup), so the same volume has a different weight. Weighing in grams is the most accurate way to measure it.

Common diced onion conversions

Quick-answer pages for the conversions people search for most.

100 g to cups

100 g diced onion ≈ 0.704 cups

200 g to cups

200 g diced onion ≈ 1.41 cups

250 g to cups

250 g diced onion ≈ 1.76 cups

500 g to cups

500 g diced onion ≈ 3.52 cups

¼ cup to grams

¼ cup diced onion ≈ 35.5 g

½ cup to grams

½ cup diced onion ≈ 71 g

1 cup to grams

1 cup diced onion ≈ 142 g

2 cups to grams

2 cups diced onion ≈ 284 g

Related converters

← All ingredient converters Cups to grams chart Recipe scaler

* Conversion figures are typical average weights for one US customary cup (236.6 ml), based on the King Arthur Baking Ingredient Weight Chart and cross-referenced with the U.S. Department of Agriculture FoodData Central database. Actual weight varies with packing, brand and humidity — see our methodology.