What Does Caster Sugar Do in Baking

Baking is a delightful combination of art and science, where the right ingredients and techniques can make all the difference. While sugar is an essential component of most baked goods, not all sugars are created equal.

Caster sugar, also known as superfine sugar, is a type of sugar that is commonly used in baking. But what does caster sugar do in baking, and how does it differ from regular granulated sugar? In this article, we’ll answer these questions and more, so you can level up your baking skills.

What is Caster Sugar?

Caster sugar is a type of sugar that has a fine, granulated texture that is between regular granulated sugar and powdered sugar. It is made by grinding granulated sugar into smaller crystals, which makes it dissolve more quickly in liquids and creates a smoother texture in baked goods. Caster sugar is commonly used in recipes where a fine texture is desired, such as meringues, cakes, and custards.

How Does Caster Sugar Affect Baking?

Caster sugar has several effects on the texture and flavor of baked goods. Here are some of the ways it can impact your baking:

  1. Moisture: Caster sugar has a lower moisture content than regular granulated sugar, which can result in a drier texture in some baked goods. However, this can also be an advantage in recipes where too much moisture can cause the texture to be too dense or heavy.
  2. Texture: Because caster sugar has smaller crystals than regular granulated sugar, it dissolves more quickly in liquids and creates a smoother texture in baked goods. This can result in a finer crumb and a more delicate texture in cakes, meringues, and other baked treats.
  3. Volume: Caster sugar can help increase the volume of some baked goods, such as meringues and whipped cream. This is because the finer crystals of caster sugar dissolve more quickly in egg whites or cream, creating more air bubbles and a lighter texture.
  4. Browning: Caster sugar can also affect the color and caramelization of baked goods. Its smaller crystals dissolve more quickly and evenly, which can result in a more even browning and a smoother surface on baked goods.

How to Use Caster Sugar in Baking?

Caster sugar can be used in a variety of recipes to achieve different results. Here are some tips for using caster sugar in your baking:

  1. Creaming: When making cakes or cookies that require creaming butter and sugar together, using caster sugar can result in a smoother and fluffier texture.
  2. Meringues: Caster sugar is commonly used in meringues because it dissolves more quickly and creates a finer texture in the final product.
  3. Custards: Caster sugar is also commonly used in custards because it dissolves more easily and evenly, resulting in a smoother texture.
  4. Whipped Cream: Using caster sugar when making whipped cream can result in a lighter and fluffier texture, as well as a longer shelf life.


Can I use regular granulated sugar instead of caster sugar?

Yes, you can substitute regular granulated sugar for caster sugar in most recipes. However, the texture and flavor of the final product may be slightly different.

Can I make my own caster sugar?

Yes, you can make your own caster sugar by grinding regular granulated sugar in a food processor or blender until it has a finer texture.

I'm Jennifer Tirrell, a self-taught baker, and founder of CakeRe. As an experienced baker and recipe publisher, I have spent over a decade working in the kitchen and have tried and tested countless baking tools and products. From classic cakes to creative twists, I've got you covered. So grab your apron and let's get baking!

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