How many grams are in a cup of red onion?

One US cup of red onion weighs about 160 g (5.64 oz). A tablespoon is about 10 g and a teaspoon about 3.33 g.

How many cups is 100 g of red onion?

100 g of red onion is about 0.63 cups — near enough to 5/8 of a cup in a measuring cup.

One red onion weighs about 110 g (3.88 oz), so a pound is roughly 4 of them.

Red onion has about 40 calories per 100 g, which works out to roughly 64 calories a cup.

Vegetables

A US cup of red onion weighs about 160 g. One weighs about 110 g. 100 g is 40 calories and 1.1 g of protein.

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1 cup of red onion is about 160 grams.

What each measure of red onion weighs, from the cup weight above.

What a recipe means when it counts red onion instead of weighing it.

The weights an older recipe card is most likely to use.

Per 100 g of edible portion, transcribed from USDA reference data, and scaled to the measures above.

Nutrition for red onion by measure
Measure	Calories	Protein	Fat	Carbs	Fiber	Sodium
Per 100 g (100 g)	40	1.1 g	0.1 g	9.3 g	1.7 g	4 mg
Per cup (160 g)	64	1.76 g	0.16 g	14.9 g	2.72 g	6 mg
Per tablespoon (10 g)	4	0.11 g	0.01 g	0.93 g	0.17 g	0 mg
Per red onion (110 g)	44	1.21 g	0.11 g	10.2 g	1.87 g	4 mg
Per 4 oz (113 g)	45	1.25 g	0.11 g	10.5 g	1.93 g	5 mg

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How many grams are in a cup of red onion?: One US cup of red onion weighs about 160 g (5.64 oz). A tablespoon is about 10 g and a teaspoon about 3.33 g.
How many cups is 100 g of red onion?: 100 g of red onion is about 0.63 cups — near enough to 5/8 of a cup in a measuring cup.
How much does one red onion weigh?: One red onion weighs about 110 g (3.88 oz), so a pound is roughly 4 of them.
How many calories are in red onion?: Red onion has about 40 calories per 100 g, which works out to roughly 64 calories a cup.