Substitute for Castor Sugar in Cake

Castor sugar, also known as caster sugar, is a fine and granulated sugar commonly used in baking. However, not everyone has this type of sugar on hand and sometimes, it can be difficult to find in stores. But don’t worry, there are many suitable substitutes for castor sugar in cake recipes.

In this article, we will explore some of the best options and provide answers to frequently asked questions about substituting castor sugar.

Alternatives to Castor Sugar in Cake

Granulated Sugar:

Granulated sugar is a direct substitute for castor sugar in cake recipes. It has a similar texture and sweetening power, making it an excellent option. Simply use an equal amount of granulated sugar in place of castor sugar.

Powdered Sugar:

Powdered sugar, also known as confectioner’s sugar, is another great substitute for castor sugar. It is finer than granulated sugar and dissolves more easily, making it ideal for use in cakes. Keep in mind that it is sweeter than castor sugar, so you may need to use a little less.

Brown Sugar:

Brown sugar is a good substitute for castor sugar, but it does add a slightly different flavor and texture to the cake. It is a good option if you want to add a hint of molasses flavor to your recipe. Use an equal amount of brown sugar as you would castor sugar.

Tips for Substituting Castor Sugar in Cake

  • If you are using granulated sugar, you may want to consider pulsing it in a food processor for a few seconds to make it finer and more similar in texture to castor sugar.
  • If you are using powdered sugar, it is best to sift it before using it in your recipe to remove any lumps.
  • When using brown sugar, be aware that it contains more moisture than castor sugar, so it may affect the texture and moistness of the cake.

Frequently Asked Questions about Substituting Castor Sugar in Cake

What happens if I don’t have any of the substitutes for castor sugar listed above?

If you don’t have any of the substitutes listed above, you can try using honey, maple syrup, or corn syrup as a last resort. Keep in mind that these options will affect the flavor of the cake and may alter the texture.

Can I use artificial sweeteners as a substitute for castor sugar in cake?

Artificial sweeteners are not recommended as a substitute for castor sugar in cake. They do not have the same sweetening power and may affect the texture and flavor of the cake.

Can I use brown sugar instead of castor sugar in all cake recipes?

Brown sugar can be used as a substitute for castor sugar in most cake recipes, but it may affect the flavor and texture of the cake. It is best to experiment with small batches until you find the right balance for your specific recipe.


Castor sugar is a popular sweetener used in baking, but it’s not always easy to find or have on hand. The good news is that there are many great substitutes for castor sugar in cake recipes, including granulated sugar, powdered sugar, and brown sugar.

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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