1 cup powdered sugar in grams, sifted and unsifted

An unsifted cup of powdered sugar weighs 113 grams: type grams or cups and pick sifted or unsifted.

113 g powdered sugar

1 cup

1 cup×1

US cup of 236.6 mL, unsifted

How this is measured

1 US cup of powdered sugar, unsifted, weighs 113 g. Based on King Arthur's ingredient weight chart: unsifted.

Other values: Sifted, 100 g a cup (USDA FoodData Central, SR Legacy): 1.13 cups; USDA, unsifted, 120 g a cup: 0.942 cups (USDA SR Legacy lists 120 g for an unsifted cup); Domino powdered sugar label, 118.3 g a cup: 0.955 cups (The maker's label gives 30 g per 1/4 cup of a 240 mL label cup, about 118 g per US cup).

How many grams in 1 cup of powdered sugar?

One US cup of powdered sugar, also called confectioners' sugar or icing sugar, weighs 113 grams measured straight from the bag, or 3.99 ounces. That is King Arthur Baking's weight for unsifted confectioners' sugar, and America's Test Kitchen lists the same 4 ounces. So 226 grams of powdered sugar is 2 cups, and a tablespoon weighs 7.06 grams.

Sifted vs unsifted powdered sugar

A cup of sifted powdered sugar weighs less than a cup measured straight from the bag:

Unsifted: 113 grams per cup (King Arthur Baking). Use it when a recipe says "1 cup powdered sugar" and nothing about sifting.
Sifted: 100 grams per cup (USDA). Use it when a recipe says "1 cup sifted powdered sugar": sift first, then spoon into the cup.

"1 cup powdered sugar, sifted" (measure, then sift) is the unsifted weight; "1 cup sifted powdered sugar" (sift, then measure) is the sifted one. 300 grams of powdered sugar is ≈ 2⅔ cups unsifted, and the same 300 grams sifted fills 3 cups.

How many cups of powdered sugar in a pound?

A pound of powdered (icing) sugar is ≈ 4 cups unsifted, and ≈ 4½ cups once sifted. A 2 lb bag holds ≈ 8 cups unsifted:

US cups to fill (≈ when rounded) and the decimal, from the weight of one cup.

US cups in pounds of powdered sugar
Pounds	Unsifted	Sifted	Unsifted, decimal	Sifted, decimal
¼ pound	≈ 1 cup	≈ 1 cup + 2 tbsp	1 cup	1.13 cups
½ pound	≈ 2 cups	≈ 2¼ cups	2.01 cups	2.27 cups
1 pound	≈ 4 cups	≈ 4½ cups	4.01 cups	4.54 cups
2 pounds	≈ 8 cups	≈ 9 cups	8.03 cups	9.07 cups

Confectioners' sugar: what other charts say

For an unsifted cup, the sources we keep run from 113 grams to 120 grams. None of them says how the cup was filled beyond "unsifted", so the cause of the difference is not stated. Our value is King Arthur's:

Our value is the one the converter uses; the others are what other sources list for a US cup.

Powdered sugar: grams in one US cup by source
Listed by	Grams in 1 US cup	Ounces	Source
King Arthur, unsiftedOur value	113 g	3.99 oz	A
USDA, siftedOur value	100 g	3.53 oz	C
USDA, unsifted	120 g	4.23 oz	C
Domino powdered sugar label	118.3 g	4.17 oz	G

Sources: A — King Arthur Baking ingredient weight chart; C — USDA FoodData Central, SR Legacy; G — Manufacturer's label serving size, as listed in USDA FoodData Central (Branded Foods).

Powdered sugar grams to cups chart

Common gram amounts of powdered sugar in US cups, unsifted and sifted:

US cups, as the cups and spoons to fill; ≈ marks the nearest measure.

Grams of powdered sugar in US cups
Grams	Unsifted	Sifted
25 g	≈ 3 tbsp + 1 tsp + ½ tsp	¼ cup
50 g	≈ ¼ cup + 3 tbsp	½ cup
100 g	≈ ¾ cup + 2 tbsp	1 cup
113 g	1 cup	≈ 1 cup + 2 tbsp
125 g	≈ 1 cup + 2 tbsp	1¼ cups
150 g	≈ 1⅓ cups	1½ cups
200 g	≈ 1¾ cups	2 cups
226 g	2 cups	≈ 2¼ cups
250 g	≈ 2¼ cups	2½ cups
300 g	≈ 2⅔ cups	3 cups
400 g	≈ 3½ cups	4 cups
500 g	≈ 4½ cups	5 cups

Cups of powdered sugar to grams

Cup fractions in grams, for frosting, glazes and icing recipes:

US cups of powdered sugar in grams
Cups	Unsifted	Sifted
⅛ cup	14.13 g	12.5 g
¼ cup	28.25 g	25 g
⅓ cup	37.67 g	33.33 g
½ cup	56.5 g	50 g
⅔ cup	75.33 g	66.67 g
¾ cup	84.75 g	75 g
1 cup	113 g	100 g
1½ cups	169.5 g	150 g
2 cups	226 g	200 g
3 cups	339 g	300 g
4 cups	452 g	400 g

Powdered, granulated and caster sugar

Of the sugars we list, powdered sugar is the lightest by the cup. A cup of granulated sugar weighs 198 grams, a cup of caster (superfine) sugar 190 grams (King Arthur Baking, Baker's Special Sugar) and a cup of packed brown sugar 213 grams. Swapping one for another cup for cup changes the weight, so convert through grams. The sugar converter has all of them.

Questions

What is 100 g in cups of powdered sugar?

≈ ¾ cup + 2 tbsp unsifted, or 1 cup sifted.

How many cups are in 500 grams of powdered sugar?

≈ 4½ cups unsifted.

How many grams is ½ cup of powdered sugar?

56.5 grams unsifted. ¼ cup is 28.25 grams and ¾ cup 84.75 grams.

What is an American cup in grams?

It depends on the ingredient: the US cup is a volume, 236.6 milliliters. Filled with unsifted powdered sugar it weighs 113 grams; with water, 236.2 grams.

Is icing sugar the same as powdered sugar?

Yes: icing sugar, confectioners' sugar and powdered sugar are names for the same product, and the converter treats them as one.

Sources

21 CFR 101.9 (US nutrition labeling)
America's Test Kitchen baking conversion chart
America's Test Kitchen, Baking Basics: Measuring Ingredients
King Arthur Baking ingredient weight chart
Manufacturer's label serving size, as listed in USDA FoodData Central (Branded Foods)
NIST Chemistry WebBook (Standard Reference Database 69), water
NIST Handbook 44, Appendix C
NIST Special Publication 430, Household Weights and Measures
USDA FoodData Central, SR Legacy
Weights and Measures Act 1985 (UK), Schedule 1