Yes, you can replace granulated sugar with powdered sugar, but the swap changes texture and requires adjustments

Powdered sugar and granulated sugar are not interchangeable in a one-to-one ratio. Powdered sugar is granulated sugar that has been ground into a fine powder and mixed with cornstarch to prevent clumping. Because it's more densely packed, a cup of powdered sugar weighs more than a cup of granulated sugar. If you swap them without adjusting the amount, your baked goods will be too sweet, too wet, or have a gritty texture.

The cornstarch in powdered sugar also affects how your recipe behaves. In some baked goods—cookies, cakes, quick breads—the swap can work if you measure by weight instead of volume. In others, like meringues or recipes that depend on sugar crystals dissolving slowly, powdered sugar will not work at all.

Key Takeaways

  • Powdered sugar weighs about 25 percent more per cup than granulated sugar, so use roughly three-quarters of a cup of powdered sugar for every cup of granulated sugar called for.
  • The cornstarch in powdered sugar can make baked goods taste slightly starchy or change their crumb structure, especially in delicate cakes.
  • Powdered sugar dissolves when ready, so it will not work in recipes where granulated sugar needs to cream with butter or form a crust on top.
  • Weighing ingredients on a kitchen scale gives you the most reliable results when substituting; if you only have volume measurements, reduce the powdered sugar by about 25 percent.

How the two sugars differ in structure and behavior

Granulated sugar consists of individual crystals that are roughly uniform in size. When you cream granulated sugar with butter, the crystals cut tiny air pockets into the fat, which helps cakes and cookies rise and become light. Powdered sugar is already pulverized, so it cannot create those air pockets the same way. Instead, it dissolves almost when ready into any liquid or fat it touches.

The cornstarch mixed into powdered sugar serves a purpose: it absorbs moisture and keeps the powder from clumping during storage. But that cornstarch becomes part of your recipe. In a cake or cookie, a small amount usually goes unnoticed. In a frosting or glaze, it can make the texture grainy or dull. In a meringue, where you need sugar to dissolve slowly and stabilize egg whites, cornstarch will interfere with the structure entirely.

Converting powdered sugar to granulated sugar by weight

The most accurate way to substitute is to weigh both sugars. One cup of granulated sugar weighs about 200 grams. One cup of powdered sugar weighs about 120 grams. If your recipe calls for 200 grams of granulated sugar, use 160 grams of powdered sugar instead—that is roughly 80 percent of the weight.

If you do not have a kitchen scale, use this volume conversion: for every one cup of granulated sugar, use three-quarters of a cup of powdered sugar. This accounts for the cornstarch and the denser packing of the powder. Measure the powdered sugar by spooning it into your measuring cup and leveling it off; do not scoop directly from the bag, which compacts it further.

Which recipes work with powdered sugar and which do not

Powdered sugar works reasonably well in cakes, brownies, and dense cookies where the sugar is straightforward mixed into the batter. The cornstarch will not noticeably affect the final texture. It also works in frostings and glazes, where the powdered sugar is the main ingredient anyway.

Do not use powdered sugar in recipes where granulated sugar needs to cream with butter—this includes most butter cakes and many cookies. The creaming process depends on the sugar crystals physically incorporating air into the fat. Powdered sugar will not do this. Avoid powdered sugar in meringues, divinity, rock candy, or any recipe where you need to cook sugar to a specific temperature (soft ball, hard crack, and so on). The cornstarch will interfere with crystallization, and the sugar will not behave as expected.

Recipes that call for a cinnamon-sugar topping or a sparkly crust also require granulated sugar. Powdered sugar will not create that texture and will dissolve into the batter instead of staying on top.

What happens if you use powdered sugar without adjusting the amount

If you use a full cup of powdered sugar where the recipe calls for a cup of granulated sugar, your baked good will be noticeably sweeter and often too moist. The extra cornstarch can also make the crumb feel slightly grainy or dense. In cookies, the dough may spread more than expected because powdered sugar dissolves faster and adds moisture.

In cakes, the result is often a denser, tighter crumb with less rise. The cake may also taste slightly starchy, especially if you are sensitive to that flavor. These problems are usually mild enough that the recipe is still edible, but the texture and taste will not match what the recipe was designed to produce.

When to use powdered sugar intentionally instead of as a substitute

Powdered sugar is the right choice for frostings, glazes, and dusting on top of finished baked goods. It dissolves smoothly into butter or cream, creating a silky frosting without grittiness. It also dissolves into milk or water to make glazes that dry with a smooth finish. For dusting, powdered sugar clings to the surface and looks elegant without the crunch of granulated sugar.

If you are making a recipe that specifically calls for powdered sugar, use it as written. Do not try to substitute granulated sugar, which will not dissolve smoothly and will create a grainy texture in frosting or glaze.

Frequently Asked Questions

Can I make powdered sugar at home if I only have granulated sugar?

Yes. Blend granulated sugar in a food processor or blender for one to two minutes until it becomes a fine powder. The result will not have cornstarch, so it will not clump during storage, but it will work in most recipes. For every one cup of granulated sugar you process, you will end up with roughly one cup of homemade powdered sugar.

Will powdered sugar work in chocolate chip cookies?

It can, but the cookies will spread more and may not have the same chewy texture. Use three-quarters of a cup of powdered sugar for every cup of granulated sugar called for. The cookies will still taste good, but they may be thinner and crisper than the recipe intended.

What if my recipe calls for powdered sugar but I only have granulated?

For frostings and glazes, you can blend granulated sugar into a powder using a food processor. For baked goods, use granulated sugar as written—do not try to convert the amount. Powdered sugar and granulated sugar are designed for different purposes, and substituting in the other direction usually does not work well.

Does the cornstarch in powdered sugar affect the taste?

In most baked goods, no. The amount of cornstarch is small enough that it does not create a noticeable flavor. In frostings or recipes where powdered sugar is a main ingredient, some people detect a very slight starchy taste, but it is usually mild.