Yes, but the swap changes texture and requires adjustments

You can replace granulated sugar with powdered sugar in most recipes, but the result will not be identical. Powdered sugar contains cornstarch and is much finer, so it dissolves faster, absorbs moisture differently, and can make baked goods denser or wetter than intended. The swap works best in recipes where texture changes matter less — frostings, glazes, and beverages — and works worst in recipes where structure depends on granulated sugar's particle size, like meringues and hard candies.

If you must use powdered sugar where granulated is called for, reduce the amount by about 25 percent and sift it first to break up clumps. For example, if a recipe asks for 1 cup of granulated sugar, use 3/4 cup of powdered sugar, sifted. This accounts for the cornstarch and the fact that powdered sugar is denser and more compact than granulated.

Key Takeaways

  • Powdered sugar contains cornstarch and dissolves faster than granulated sugar, which changes how baked goods brown and set.
  • Use powdered sugar as a direct swap only in frostings, glazes, whipped cream, and drinks where texture is forgiving.
  • In cakes, cookies, and other baked goods, reduce powdered sugar by about 25 percent and sift it first to avoid dense or gummy results.
  • Never use powdered sugar in recipes that depend on sugar crystals for structure, such as meringues, rock candy, or hard candies.

Why powdered sugar behaves differently in recipes

Granulated sugar and powdered sugar are not interchangeable because they have different physical properties. Granulated sugar is made of larger crystals that dissolve slowly and create structure as they break down during mixing and baking. Powdered sugar is ground into a fine powder and mixed with cornstarch (usually 1 to 3 percent by weight) to prevent clumping.

The cornstarch changes how the sugar behaves in heat. It absorbs moisture, which can make batters wetter and baked goods gummier. The fine particle size means powdered sugar dissolves almost when ready when wet, so it does not create the same creaming action when beaten with butter — a step that traps air and lightens cakes and cookies. In recipes where this creaming step matters, the final texture suffers.

When powdered sugar works as a direct swap

Powdered sugar is the right choice — and often the only choice — for frostings and glazes. These recipes expect a smooth, spreadable texture, and powdered sugar delivers that without any adjustment. Buttercream frosting, cream cheese frosting, royal icing, and glaze all rely on powdered sugar's fine texture and quick dissolution.

Powdered sugar also works well in whipped cream, beverages like lemonade or iced tea, and dusted toppings. In these applications, the sugar does not need to create structure or brown in the oven, so the cornstarch and fine texture are not drawbacks. You can use powdered sugar in a 1-to-1 ratio in these cases.

How to substitute powdered sugar in baked goods

If a recipe calls for granulated sugar and you only have powdered sugar, reduce the amount by 25 percent. Measure out the powdered sugar, then sift it through a fine-mesh strainer to break up clumps and remove excess cornstarch. This step is not optional — lumpy powdered sugar will create streaks in your batter.

For a recipe that calls for 1 cup of granulated sugar, measure 3/4 cup of powdered sugar and sift it. Mix it into your batter as you normally would. The result will likely be slightly denser and may brown less evenly than it would with granulated sugar, but it should still be edible. Cakes may be a bit more tender; cookies may spread slightly more.

If the recipe involves creaming butter and sugar together — a common step in cakes and cookies — expect less volume and a denser crumb. The powdered sugar will not trap as much air, so the final product will be heavier. This is not a failure; it is straightforward a different texture.

Recipes where powdered sugar does not work

Do not use powdered sugar in meringues, divinity, rock candy, hard candies, or any recipe where sugar crystals must form or hold their shape. These recipes depend on granulated sugar's ability to dissolve at a specific rate and recrystallize in a controlled way. The cornstarch in powdered sugar interferes with this process and will produce a grainy, separated, or failed batch.

Avoid powdered sugar in recipes that call for caramelizing sugar, such as crème brûlée or caramel sauce. The cornstarch will burn and create a bitter taste, and the sugar will not caramelize evenly. Granulated sugar is essential for these recipes.

What to do if you have only powdered sugar on hand

If you are in the middle of baking and have no granulated sugar, your best option depends on what you are making. For cakes, quick breads, and most cookies, the powdered sugar swap will work if you reduce the amount and sift first. The texture will not be perfect, but the result will be usable.

For recipes that are sensitive to sugar type — candy, meringue, caramel — you should stop and find granulated sugar instead. Substituting will almost certainly fail. Check a neighbor, a nearby store, or a delivery service rather than risk wasting ingredients.

If you have time, you can make a rough version of granulated sugar by processing powdered sugar in a food processor for a few minutes. This will not remove the cornstarch, but it will break up the fine particles and make the texture closer to granulated. Sift the result before using it.

Frequently Asked Questions

Can I use powdered sugar in chocolate chip cookies?

Yes, but reduce the amount by 25 percent and sift it first. The cookies will spread a bit more and be slightly softer than they would with granulated sugar, but they will still taste good. The cornstarch in powdered sugar absorbs moisture, so the dough may be slightly wetter than expected.

Will powdered sugar work in a cake recipe?

It will work, but the cake will be denser and may not rise as much. Reduce the powdered sugar by 25 percent, sift it, and expect a more tender crumb. The cake will still be edible, though the texture will differ from the original recipe.

What is the difference between powdered sugar and confectioners sugar?

They are the same thing. Powdered sugar, confectioners sugar, and icing sugar are all names for the same product — granulated sugar ground into a fine powder and mixed with cornstarch. The names vary by region and brand.

Can I use powdered sugar in lemonade or iced tea?

Yes, without any adjustment. Powdered sugar dissolves quickly in cold liquid and requires no special handling. Use it in a 1-to-1 ratio with granulated sugar by weight, though you may need slightly less because powdered sugar is denser.

Why does powdered sugar have cornstarch in it?

Cornstarch prevents powdered sugar from clumping and absorbing moisture during storage. Without it, the fine sugar particles would stick together and form hard lumps. The cornstarch is inert and does not affect flavor, but it does change how the sugar behaves in recipes.