You can make powdered sugar by blending granulated sugar with a spoonful of cornstarch until fine and fluffy.
Running out of powdered sugar halfway through a recipe feels frustrating, especially when frosting or glaze is already in progress. The good news is that you can turn plain granulated sugar into a smooth, dust-fine sweetener in just a few minutes with tools you already own.
This guide walks through how can you make powdered sugar? with clear steps, reliable ratios, and small tricks that match what commercial confectioners do. You will see where homemade powdered sugar shines, when store-bought still helps, and how to avoid gritty icing or strange aftertastes.
How Can You Make Powdered Sugar At Home Safely?
Powdered sugar is regular white sugar ground so fine that it turns into a silky powder. Manufacturers mix in a little starch to keep it dry and clump-free. You can copy that process on a smaller scale by blending sugar with a small amount of cornstarch or another starch.
The basic ratio many test kitchens and baking writers suggest is one tablespoon of cornstarch per cup of granulated sugar. That amount shows up in home recipes for confectioners’ sugar and matches what you see in packaged powdered sugar labels from large brands. You can see a similar ratio in Food52’s guide to homemade powdered sugar, which weighs starch at roughly three percent of the sugar.
| Granulated Sugar Start | Cornstarch To Add | Approx. Powdered Sugar Yield |
|---|---|---|
| 1/2 cup | 1 1/2 teaspoons | About 1 cup |
| 1 cup | 1 tablespoon | About 2 cups |
| 1 1/2 cups | 1 1/2 tablespoons | About 3 cups |
| 2 cups | 2 tablespoons | About 4 cups |
| 3 cups | 3 tablespoons | About 6 cups |
| 4 cups | 4 tablespoons | About 8 cups |
| 5 cups | 5 tablespoons | About 10 cups |
Tools And Ingredients You Need
Before you grind, set up your tools. A strong blender or food processor gives the smoothest texture, though a spice grinder or high-speed bullet blender also works in small batches. You will also want a fine mesh sieve, an airtight container, and a spoon or rubber spatula to scrape the sides.
For ingredients, start with plain white granulated sugar. Organic, cane, or beet sugar all grind down well. Add cornstarch for long-term storage, or arrowroot starch if you want a corn-free version. Both starches absorb surface moisture so the powdered sugar stays dry and light.
Step-By-Step Blender Method
- Measure your granulated sugar into the blender jar, leaving enough headspace so the sugar can move around freely.
- Add the cornstarch or arrowroot starch on top of the sugar.
- Close the lid tightly, then pulse a few times to start breaking down the crystals.
- Blend on high for thirty seconds to a minute, pausing to scrape the sides if sugar cakes onto the jar.
- Stop the blender and let the powder settle before opening the lid so you are not greeted by a sugar cloud.
- Rub a pinch between your fingers. If it still feels even slightly gritty, blend again in short bursts, checking often.
- When the texture feels smooth and soft, sift the sugar through a fine mesh sieve into a bowl, then move it into an airtight jar.
Making Powdered Sugar Without Cornstarch
If you are using the sugar right away in a glaze or whipped cream, you can skip the starch completely. Just blend the granulated sugar on its own until it turns powdery. The texture will match regular powdered sugar, but it may clump faster once it sits.
When you want a starch that blends cleanly into sauces, arrowroot works well. Some baking writers recommend using about three percent starch by weight rather than a fixed spoon measure. That approach mirrors how commercial makers calculate formulas and keeps the mouthfeel soft, even in thin icings.
Making Powdered Sugar From Granulated Sugar For Baking
Store-bought powdered sugar usually contains finely ground sugar plus cornstarch in roughly the same ratio described above. That blend helps frostings hold their shape and prevents dusted desserts from turning sticky. Homemade versions behave in much the same way when the texture is fine and the starch level sits in the same range.
One large resource that tracks nutrition data, USDA FoodData Central, lists powdered sugar under the name “Sugars, powdered,” with each cup providing a dense dose of carbohydrates and little else. That is the same basic profile as granulated sugar, so swapping homemade powdered sugar into recipes does not change the nutritional picture in a major way.
Where Homemade Powdered Sugar Works Best
Homemade powdered sugar fits casual baking jobs especially well. Quick glazes for snack cakes, dusting brownies, and stirring into whipped cream all rely more on texture than on ultra precise consistency. Once the sugar is ground fine and sifted, it dissolves fast and gives a smooth finish.
For royal icing, glossy buttercream, or work that must pipe with sharp detail, packaged powdered sugar still has an edge. Commercial mills grind sugar under tight controls, which gives a uniform grain that behaves predictably in baked goods that need clean lines, strong structure, or long shelf life.
Choosing The Right Sugar And Starch
White granulated sugar gives the brightest color and a neutral flavor. Turbinado or raw sugar can be ground too, though you may see a creamy beige tone and a deeper caramel note in the finished frosting. That can taste great with chocolate cake or banana bread, as long as the color shift fits the look you want.
Cornstarch brings a light, dry feel and is the standard choice in most home recipes. Arrowroot starch adds a silkier touch in cold sauces and glazes and works better for people who avoid corn. Both options help stop clumps from forming while the sugar waits in the jar.
Tuning Homemade Powdered Sugar For Different Recipes
Once you learn the basic method, the question shifts from how can you make powdered sugar? to how finely you should grind it and how much starch you want. A short blend gives a texture that still feels slightly sandy, which can work in some crumb toppings. A longer blend with thorough sifting gets closer to a commercial confectioners’ grind.
Recipe needs also shape how much starch you use. Some bakers prefer the full tablespoon per cup when they are making buttercream that needs to hold up for hours. Others cut the starch in half when the sugar will be used right away in a sauce so the texture stays loose and glossy.
| Recipe Type | Grind Level | Suggested Starch Amount |
|---|---|---|
| Simple Dusting On Cake | Fine, quick sift | Half tablespoon per cup |
| Thin Glaze Or Icing | Fine, no grit | Half to one tablespoon per cup |
| Buttercream Frosting | Very fine, double sifted | One tablespoon per cup |
| Royal Icing | Ultra fine, long blend | One tablespoon per cup |
| Whipped Cream Sweetening | Fine, light blend | Half tablespoon per cup |
| Cream Cheese Frosting | Very fine, well sifted | One tablespoon per cup |
| Decorative Drizzles | Fine, pourable | Half tablespoon per cup |
Using Homemade Powdered Sugar In Place Of Store-Bought
Most recipes that call for powdered sugar assume the standard cup-for-cup volume of commercial confectioners’ sugar. Since one cup of granulated sugar fluffs up to about two cups once ground, that rule of thumb helps you scale batches. Grind a little extra so you are not scraping the bottom of the jar during frosting.
When you swap homemade powdered sugar into an older family recipe, start by matching the volume in cups. If the frosting seems slightly thicker, add a teaspoon or two of milk or lemon juice. If it feels loose, sift in a spoonful more powdered sugar until the texture settles where you like it.
Nutrition Notes And Sugar Awareness
Powdered sugar may feel lighter on the spoon, but nutritionally it mirrors plain table sugar. Data compiled by tools that draw from USDA FoodData Central show that both forms pack dense carbohydrate content with minimal micronutrients. Portion size stays the real lever for moderating intake in frosted treats and glazed pastries.
Because powdered sugar dissolves quickly, it can make sweet treats easy to eat in large amounts without much chewing. Pair desserts with fruit, nuts, or dairy so a small serving feels more balanced and satisfying, and lean on homemade powdered sugar as a flexible baking ingredient rather than a snack on its own.
Storing Homemade Powdered Sugar
Once the sugar is ground and sifted, move it into a clean, dry, airtight container. Glass jars with tight lids or sturdy plastic canisters both work well. Label the jar with the date and the starch used so you know what is inside and how long it has been there.
Keep the jar away from steam, heat, and strong odors. A pantry shelf beats a cupboard right over the stove, where rising steam can cause clumps. If the sugar still forms small lumps after a few weeks, press it through a sieve again before sprinkling over cake or whisking into glaze.
Checking Freshness Before You Bake
Before each use, open the container and stir the sugar with a dry spoon. If it smells clean and sweet, flows easily, and looks bright, it is ready to use. If you see any signs of moisture, off odors, or pantry pests, throw it out and grind a fresh batch.
For most home kitchens, a jar of powdered sugar with starch stays in good shape for several months at room temperature. Small, fresh batches every few weeks give the best texture, though, and that short grind time fits easily into normal baking prep.
With a clear ratio, a sturdy blender, and a jar in the pantry, making your own powdered sugar becomes a simple habit. You save last-minute trips to the store, keep frosting projects on track, and learn to tune the texture and starch level to match every cake, cookie, and pastry you bake.
