Powdered sugar grams to cups conversions surprise a lot of bakers, since powdered sugar shares almost the exact same density as flour despite looking and tasting completely different. 1 cup of powdered sugar weighs about 120 grams, the same baseline used throughout this guide.
Use the calculator above to convert any amount of powdered sugar or more than 50 other ingredients instantly with our Grams to Cups converter. Below, you'll find a complete conversion chart, the formula behind the calculation, and how powdered sugar compares with its granulated counterpart.
How Many Cups Is Powdered Sugar? (Quick Chart)
Here's how common gram amounts of powdered sugar convert to cups:
| Grams | Powdered Sugar in Cups |
| 50g | 0.42 cups |
| 100g | 0.83 cups |
| 120g | 1.00 cup |
| 150g | 1.25 cups |
| 300g | 2.50 cups |
| 500g | 4.17 cups |
Notice 120 grams lands on a clean, exact 1 cup a handy number to remember, since it means you can use "grams ÷ 120" for a quick mental estimate at any amount.
How to Convert Grams to Cups for Powdered Sugar (Formula)
Cups = Grams ÷ 120
Worked Example: 300 Grams of Powdered Sugar
- Take the grams-per-cup value for powdered sugar: 120 grams.
- Divide: 300 ÷ 120 = 2.5.
- Answer: 2.5 cups, exactly 2 1/2 cups.
Powdered Sugar vs. Granulated Sugar: Why the Big Difference?
This is where a lot of confusion starts. Granulated sugar weighs about 200 grams per cup nearly 70% heavier than powdered sugar's 120 grams for the exact same cup.
The reason comes down to particle size and processing. Granulated sugar is made of solid crystals that pack together tightly, leaving relatively little air between them. Powdered sugar (also called confectioners' sugar) is granulated sugar ground into an extremely fine powder, usually with a small amount of cornstarch added to prevent clumping. That fine powder traps far more air, so the same cup holds much less actual sugar by weight.
This is exactly why substituting powdered sugar for granulated sugar (or the other way around) in a recipe measuring by cups instead of weight can throw off the sweetness and texture significantly, even though the volume looks the same.
At 200 grams, this difference is easy to see side by side:
- 200 grams of powdered sugar ≈ 1.67 cups
- 200 grams of granulated sugar ≈ 1.00 cup
Same weight, but powdered sugar takes up two-thirds more space.
Cups of Powdered Sugar to Grams (Reverse Conversion)
Going the other direction is just as simple multiply the number of cups by 120:
- 1 cup = 120 grams
- 2 cups = 240 grams
- 1/2 cup = 60 grams
- 1/4 cup = 30 grams
Why Sifting Matters More for Powdered Sugar
Powdered sugar clumps easily during storage, more so than most other dry ingredients. If it isn't broken up before measuring, those clumps can trap extra air pockets or, in the opposite direction, sit unevenly packed in the cup either way throwing off the standard 120-grams-per-cup figure.
For the most accurate cup measurement:
- Break up any clumps by pressing the sugar through a sieve or fork before measuring.
- Spoon it into the measuring cup loosely, without pressing down.
- Level the top with the flat edge of a knife.
Skipping this step is one of the more common reasons powdered sugar measurements come out inconsistent between bakers using the same recipe.
FAQ’s
How many grams is a cup of powdered sugar?
A level cup of powdered sugar, measured with the spoon-and-level method, weighs about 120 grams the same density as all-purpose flour, despite the two ingredients being very different.
How many cups is 100 grams of powdered sugar?
100 grams of powdered sugar is about 0.83 cups, based on the standard 120-grams-per-cup measurement.
How many cups is 150 grams of powdered sugar?
150 grams of powdered sugar is about 1.25 cups, or 1 1/4 cups, based on 120 grams per cup.
Why does powdered sugar weigh less per cup than granulated sugar?
Powdered sugar is ground into a very fine powder, which traps far more air between particles than granulated sugar's solid crystals. That extra trapped air is why 1 cup of powdered sugar (120g) weighs significantly less than 1 cup of granulated sugar (200g).
What's the most accurate way to measure powdered sugar?
A digital kitchen scale is the most accurate method, especially since powdered sugar's tendency to clump makes cup measurements less consistent than most other dry ingredients. If you don't have one, sift or break up clumps first, then spoon and level the sugar into the cup.
Final Thoughts
Converting powdered sugar grams to cups comes down to one reliable figure: 120 grams per cup, the same density as flour despite looking nothing alike. Because powdered sugar clumps more easily than most dry ingredients, breaking it up before measuring matters more here than it does for many other conversions on this site.
Use the calculator at the top of this page any time you need an instant, accurate conversion for powdered sugar, at any gram amount.