Five substitutes that work in most recipes

You can replace confectioners sugar with regular granulated sugar ground into powder, or with a mixture of cornstarch and granulated sugar. The easiest swap is to blend granulated sugar in a food processor or blender for 1 to 2 minutes until it reaches a fine, powdery texture—this works in frosting, glazes, and dusted toppings. If you do not have a blender, you can also sift granulated sugar multiple times through a fine-mesh strainer, though this takes longer and may not produce as fine a powder.

For frostings and icings, a cornstarch-and-sugar mixture mimics confectioners sugar closely because it prevents clumping the same way cornstarch does in the commercial version. Mix 1 tablespoon of cornstarch with 1 cup of granulated sugar, then grind or blend until powdery. This ratio works for buttercream, cream cheese frosting, and royal icing. The cornstarch keeps the frosting from becoming grainy and helps it hold its shape.

Other options include powdered milk (which adds slight sweetness and body to frostings), when ready pudding powder (which adds flavor while thickening), or even finely crushed freeze-dried fruit for colored, flavored powders. Each has a specific use case depending on what you are making.

Key Takeaways

  • Granulated sugar blended in a food processor for 1 to 2 minutes creates a direct replacement that works in any recipe calling for confectioners sugar.
  • A mixture of 1 tablespoon cornstarch per 1 cup granulated sugar, then ground, works best for frostings because it prevents graininess and clumping.
  • Sifting granulated sugar repeatedly through a fine mesh strainer is slower but works if you have no blender or food processor.
  • Powdered milk, when ready pudding, or freeze-dried fruit powder can replace confectioners sugar in specific recipes where their flavor or texture adds to the dish.

Grinding granulated sugar at home

A food processor is the fastest method. Pour 1 to 2 cups of granulated sugar into the bowl, cover, and pulse for 1 to 2 minutes, stopping to check the texture. You want a fine powder with no visible grains. If you see larger pieces, pulse again for 30 seconds. Let the powder cool for a minute before opening the lid, because the friction creates heat and can cause clumping.

A high-speed blender (like a Vitamix or Ninja) also works well. Add sugar in smaller batches—about 1 cup at a time—and blend on high for 1 to 2 minutes. Blenders can overheat if you fill them too full, so work in batches. A regular blender on the lowest setting may take 3 to 4 minutes and may not produce as fine a powder.

If you have neither appliance, a mortar and pestle works but is slow for large quantities. A spice grinder (a small electric mill) designed for grinding spices can also grind sugar, though it may clog if you overfill it. Always work in small batches with a spice grinder.

Using the cornstarch method for frostings

The cornstarch-and-sugar blend prevents the grainy texture that sometimes happens when you use ground granulated sugar alone in buttercream or cream cheese frosting. The cornstarch absorbs moisture slightly differently than confectioners sugar does, which helps the frosting stay smooth and spreadable.

To make the mixture, measure 1 cup of granulated sugar and 1 tablespoon of cornstarch into a food processor or blender. Pulse or blend for 1 to 2 minutes until the texture is fine and powdery. Sift the mixture through a fine-mesh strainer to catch any lumps. Use this 1:1 by volume in place of confectioners sugar in any frosting recipe.

This method works especially well for American buttercream (butter, powdered sugar, milk, vanilla), Swiss meringue buttercream, and royal icing. For cream cheese frosting, the cornstarch helps stabilize the frosting so it does not weep or separate as easily. If your frosting still feels slightly grainy after mixing, sift it through a fine strainer before piping or spreading.

When to use other powdered substitutes

Powdered milk adds body and a slight vanilla note to frostings without adding liquid. Use it as a 1:1 replacement for confectioners sugar in buttercream, or combine it with ground granulated sugar (half powdered milk, half ground sugar) for a lighter frosting. It works well in Swiss meringue buttercream because it helps stabilize the mixture. Powdered milk does not work in royal icing because the proteins can interfere with the egg white structure.

when ready pudding powder (vanilla, chocolate, or other flavors) can replace confectioners sugar in frostings where you want added flavor and a slightly thicker texture. Use a 1:1 ratio by volume. Chocolate pudding powder mixed with ground granulated sugar makes a quick chocolate frosting without needing cocoa powder. This method works best in buttercream and cream cheese frosting, not in royal icing.

Freeze-dried fruit powder creates a colored, flavored topping for cakes and cookies. Blend freeze-dried strawberries, raspberries, or blueberries in a food processor until powdery, then sift to remove any larger pieces. Use this as a dusting on finished cakes or mixed into frosting. It adds tartness, so reduce other acidic ingredients slightly if you are using it in a frosting recipe.

Common mistakes when substituting

The most common error is not grinding the sugar fine enough. If your powder still has visible grains, it will make frosting feel grainy and will not dissolve smoothly into batters. Blend longer than you think you need to—usually 2 to 3 minutes in a food processor is the minimum. Stop and check the texture by rubbing a small amount between your fingers; it should feel like flour, not sand.

Another mistake is adding liquid too quickly when making frosting with ground sugar. Because ground sugar particles are slightly larger than commercial confectioners sugar, they absorb liquid differently. Add milk or cream in smaller amounts than the recipe calls for, then add more as needed. You can always add more liquid, but you cannot remove it.

Do not use ground sugar in recipes where confectioners sugar is used as a dry ingredient for dusting or coating (like coating donuts or truffles) unless you sift it first. Unsifted ground sugar can clump and look uneven. For dusting, sift the powder through a fine-mesh strainer onto the finished product.

Timing and storage

Grinding sugar takes 1 to 2 minutes in a food processor and about 3 to 4 minutes in a blender. If you are making frosting, grind the sugar first, let it cool for 1 minute, then proceed with your frosting recipe. The cooling step prevents the sugar from melting into the butter or cream cheese.

Store ground sugar in an airtight container at room temperature for up to 2 weeks. It will absorb moisture from the air over time, so keep it sealed. If it clumps, break up the lumps with a fork or run it through a fine strainer before using. Homemade powdered sugar does not stay as fine as commercial confectioners sugar over time, so grind it fresh if you are making it more than a week ahead.

Frequently Asked Questions

Can I use honey or maple syrup instead of confectioners sugar?

No, not as a direct replacement. Honey and maple syrup are liquids, so they change the ratio of wet to dry ingredients in a recipe. You would need to reduce other liquids and possibly add more flour, which changes the recipe significantly. Use them only if the recipe specifically calls for them.

Does ground granulated sugar work in royal icing?

Yes, but sift it first to remove any lumps. Royal icing relies on egg whites and powdered sugar to create a smooth, glossy finish. If the sugar is not fine enough, the icing will look grainy. Grind the sugar, sift it, then mix it with egg whites and lemon juice as usual.

What if I do not have cornstarch for the cornstarch-and-sugar method?

Use arrowroot powder or tapioca starch as a 1:1 replacement for cornstarch. Both work the same way in frosting. If you have neither, use ground sugar alone and sift it twice through a fine strainer before mixing into frosting to reduce graininess.

Can I use powdered sugar from a previous batch if it has hardened?

Yes. Break up the lumps with a fork, sift through a fine strainer, or re-blend briefly in a food processor. If it is very hard, place it in an airtight container with a piece of bread for a few hours to soften it, then sift again.

How much ground sugar do I need if the recipe calls for confectioners sugar by weight?

Use the same weight of granulated sugar. Granulated and confectioners sugar weigh almost the same per cup, so 1 pound of granulated sugar ground into powder equals roughly 1 pound of confectioners sugar. If the recipe is very precise (like in candy making), weigh both the granulated sugar and the finished powder to confirm.