Grams of Powdered Sugar to Cups Converter

Conversion of Grams of Powdered Sugar to Cups

For a quick estimate, use:

Cups = grams ÷ 120

Examples:

30 g ≈ ¼ Cup
60 g ≈ ½ Cup
90 g ≈ ¾ Cup
100 g ≈ 0.83 cups
120 g ≈ 1 Cup
150 g ≈ 1¼ cups
200 g ≈ 1⅔ Cups
250 g ≈ 2⅛ cups
500 g ≈ 4⅙ cups

These figures are useful estimates for kitchen use, not laboratory measurements. The actual weight of a cup can vary depending on the product, moisture content, sieving, and measuring method.

Free Conversion Tool

Grams To Cups Converter

Convert grams to cups instantly for common cooking and baking ingredients.

IngredientGrams

Per cup

120g

Result

0.833

cups

5/6

Powdered Sugar

Sift before measuring

How Many Cups Are Equivalent to 100 Grams of Powdered Sugar?

100 grams of powdered sugar is approximately equivalent to 0.83 US cups, when using a working value of 120g per cup. That is approximately ⅞ cup.

When preparing a recipe where the sugar affects the final consistency, directly weighing out 100 grams is more reliable than attempting to measure 0.83 cups.

Powdered Sugar Conversion Chart

Grams	Cups	Approximate Measure
25 g	0.21 cup	about 3½ tbsp
30 g	0.25 cup	¼ cup
40 g	0.33 cup	⅓ cup
50 g	0.42 cup	about ⅜ cup
60 g	0.50 cup	½ cup
75 g	0.63 cup	about ⅝ cup
90 g	0.75 cup	¾ cup
100 g	0.83 cup	about ⅞ cup
120 g	1.00 cup	1 cup
150 g	1.25 cups	1¼ cups
180 g	1.50 cups	1½ cups
200 g	1.67 cups	1⅔ cups
240 g	2.00 cups	2 cups
250 g	2.08 cups	about 2⅛ cups
300 g	2.50 cups	2½ cups
400 g	3.33 cups	about 3⅓ cups
500 g	4.17 cups	about 4⅙ cups

Why Powdered Sugar Weighs Less Than Granulated Sugar

Powdered sugar is produced by grinding sugar into very small particles. Commercially available products sometimes contain small amounts of an anti-caking agent to ensure the powder remains free-flowing. Due to its fine texture, it exhibits very different volume properties than ordinary granulated sugar.

Therefore, you should not use the same value for grams per cup for both varieties.

For comparison: Granulated sugar typically weighs about 200 g per cup, while powdered sugar is significantly lighter. Therefore, directly substituting granulated sugar can change the amount of sugar needed in a recipe.

Does Sifting Change the Weight?

Yes. Sifting breaks up clumps and loosens the powder, which can change how much sugar occupies a cup.

This is why recipe wording matters.

"1 cup powdered sugar, sifted" generally means measure the sugar first and then sift it.
"1 cup sifted powdered sugar" means to sift the sugar first and then measure it.

If your recipe specifies the weight in grams, the distinction is much less important, as the quantity is already indicated by the mass.

How to Measure Powdered Sugar in Cups

If you do not have a scale, use a consistent measuring method:

Break up visible lumps.
Spoon the powdered sugar gently into the measuring cup.
Do not press or pack it down unless the recipe specifically tells you to.
Level the top with a straight edge.
Follow the recipe's instructions if it says the sugar should be sifted before or after measuring.
Avoid filling the cup with a firm spoon through a container of settled powdered sugar. This can result in a different weight than a loose spoonful.

Powdered Sugar vs. Granulated Sugar

Powdered sugar and granulated sugar are both forms of sugar, but they are not interchangeable by volume.

For example, using the working values in this guide:

1 cup powdered sugar ≈ 120 g

1 cup granulated sugar ≈ 200 g

So replacing one cup with one cup does not preserve the same weight. If you are substituting one type of sugar for another, check the recipe and consider using weight rather than volume.

When a Kitchen Scale Is Better

A cup is convenient for everyday recipes, but weighing powdered sugar is the better choice when consistency matters. Use a scale when:

the recipe is written in grams;
you are doubling or halving a recipe;
you are making a large batch of frosting;
you are preparing a recipe where texture needs to be consistent;
different people need to reproduce the same recipe.

A scale also removes uncertainty caused by settling, clumping, and different measuring habits.

Powdered Sugar Conversion Formula

For this converter, the working reference is:

1 US cup powdered sugar ≈ 120 g

Cups = grams ÷ 120

Grams = cups × 120

For example:

180 g ÷ 120 = 1.5 cups. So 180 grams is approximately 1½ cups using this conversion.

Because volume measurements can vary, these results should be treated as practical estimates.

How Accurate Is 120 g per Cup?

The 120 g/cup figure is a rounded kitchen reference, not a universal fixed density. Established baking references can use slightly different values depending on how the ingredient is measured. For example, King Arthur Baking's ingredient weight chart currently lists 113 g for 1 cup of unsifted confectioners' sugar and recommends weighing ingredients for the best results.

For a simple online converter, 120 g/cup provides an easy rounded number. If your recipe was tested using a specific brand or gives its own gram weight, follow the recipe's measurement instead.

About Powdered Sugar

Powdered sugar is a finely ground form of sugar used for foods such as frosting, icing, glazes, and some baked goods. Its fine particles allow it to blend quickly into mixtures where a smooth texture is wanted.

BAKERpedia provides additional baking-industry information about powdered sugar, including its fine particle structure, production, and use in food applications. This is also why powdered sugar behaves differently from ordinary granulated sugar when measured by volume.

Quick Reference

For the 120 g/cup working conversion:

30 g ≈ ¼ cup
60 g ≈ ½ cup
90 g ≈ ¾ cup
100 g ≈ 0.83 cup
120 g ≈ 1 cup
150 g ≈ 1¼ cups
200 g ≈ 1⅔ cups
250 g ≈ 2⅛ cups
300 g ≈ 2½ cups
500 g ≈ 4⅙ cups

Frequently Asked Questions

How many grams are in 1 cup of powdered sugar?

For this converter, 1 cup is approximately 120 grams. The actual weight can vary depending on the product and how it is measured.

How many cups are 100 grams of powdered sugar?

100 grams is about 0.83 cup, or approximately ⅞ cup, using the 120 g/cup working value.

How many grams are in ½ cup of powdered sugar?

Using the same conversion, ½ cup is about 60 grams.

How many grams are in ¼ cup of powdered sugar?

¼ cup is about 30 grams using the 120 g/cup reference.

Should powdered sugar be packed into a cup?

Usually, no. Powdered sugar is generally measured lightly and leveled unless the recipe gives different instructions. Packing can increase the amount of sugar in the cup.

Is sifted powdered sugar the same as unsifted powdered sugar?

Not necessarily by volume. Sifting loosens the powder and removes or breaks up clumps, so the same cup measurement can contain a different weight.

Is powdered sugar the same as granulated sugar?

No. They are different forms of sugar with different textures and different weights per cup. They should not automatically be substituted cup-for-cup.

Sources and Measurement Notes

The conversion on this page uses 120 g per US cup as a rounded practical reference.

King Arthur Baking's Ingredient Weight Chart — lists 113 g for one cup of unsifted confectioners' sugar and recommends weighing ingredients for best results.
BAKERpedia's Powdered Sugar Guide — additional technical information about powdered sugar and its baking applications.

The Bottom Line

For a quick conversion, use about 120 grams of powdered sugar per US cup. That gives you:

100 g ≈ 0.83 cup
120 g ≈ 1 cup
200 g ≈ 1⅔ cups
500 g ≈ 4⅙ cups

For everyday baking, these estimates are useful. When the recipe needs to be highly consistent, use a digital scale and measure the powdered sugar directly in grams.