How many grams in a cup of powdered sugar?

1 cup of unsifted powdered sugar weighs 113 g by King Arthur Baking's chart. USDA lists 120 g unsifted and 100 g sifted.

Sources: King Arthur Baking ingredient weight chart, USDA FoodData Central · Checked October 10, 2026

Amount

Unit

113 g 4 oz

Sources range from 113 g to 120 g for 1 cup.

Converting a whole recipe?

Sous Chef converts every ingredient in a recipe to grams and millilitres in one tap, rounded to amounts you would actually weigh.

Powdered sugar cups to grams table

Using 113 g per US cup. A US cup is 236.6 mL; 1 cup is 16 tablespoons.

Powdered sugar cups to grams
US cups	Grams	Ounces	Tablespoons
⅛ cup	14 g	0.5 oz	2
¼ cup	28 g	1 oz	4
⅓ cup	38 g	1.3 oz	5.3
½ cup	57 g	2 oz	8
⅔ cup	75 g	2.7 oz	10.7
¾ cup	85 g	3 oz	12
1 cup	113 g	4 oz	16
1½ cups	170 g	6 oz	24
2 cups	226 g	8 oz	32
3 cups	339 g	12 oz	48
4 cups	452 g	15.9 oz	64

Why sources disagree

Powdered sugar is a fine powder that packs down in the bag and fluffs up when sifted. Sifting adds air, so a sifted cup weighs about 15 to 20 g less. Check whether your recipe says to sift before or after measuring.

Source	Listed as	Grams per cup
King Arthur Baking ingredient weight chart Confectioners' sugar (unsifted)	1 cup unsifted = 113 g	113 g
USDA FoodData Central Sugars, powdered	1 cup unsifted = 120 g	120 g

Bold row is the figure the calculator uses. Figures listed for a smaller measure are multiplied up to one cup.

How to measure powdered sugar accurately

Check whether the recipe says sifted or unsifted, since sifted powdered sugar is lighter per cup.
Weigh on a digital scale when you can, since cup scoops vary from cook to cook.
If you use cups, fill the same way every time so your results stay consistent.

Convert the whole recipe, not one line

Converting a recipe one ingredient at a time is where mistakes slip in. Sous Chef imports a recipe from a link or pasted text, then converts every ingredient at once: dry ingredients and butter to grams, liquids to millilitres. Tap again to go back to cups.

US recipe

2¼ cups all-purpose flour
1 cup butter, softened
¾ cup brown sugar, packed
1½ cups milk

In Sous Chef, after "Convert to metric"

275 g all-purpose flour
225 g butter, softened
170 g brown sugar, packed
350 ml milk

Example output. Sous Chef rounds to amounts you would actually weigh, so its numbers can differ by a few grams from the table above.

Common questions

How many grams is half a cup of powdered sugar?

Half a cup of powdered sugar is about 57 g, using 113 g per cup.

How many grams is 1 tablespoon of powdered sugar?

1 tablespoon of powdered sugar is about 7 g, since 1 cup is 16 tablespoons and 113 g per cup divided by 16 is 7 g.

More conversions

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