Caster Sugar Vs. Powdered Sugar: Know the Difference

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Caster Sugar Vs. Powdered Sugar – Many of us are unaware of the difference between caster and powdered sugar. In fact, for many, there is supposedly no difference at all. However, the fact is that they both are different.

It is essential to know the difference so that you can decide whether you can use them interchangeably or not. This knowledge is also useful in deciding which of the two is a confectionary item.

Just imagine that you are baking a sweet dish for your beloved ones whose ingredients include caster sugar. However, you only have powdered sugar in your kitchen. So, at this point, if you know the difference, you can decide whether to use the powdered form or not.

Let’s distinguish caster sugar vs. powdered sugar by knowing their meaning and characteristics.

Caster Sugar Vs. Powdered Sugar – Overview

Unlike regular sugar, caster sugar is nothing but fine granules that tend to dissolve quickly. It is in the refined form due to which the packages of this sugar usually have the label of ‘superfine’. However, caster sugar is also available in the unrefined form.

Its texture is between that of conventional and confectioner forms. However, as a substitute, only the ground conventional form is used. As finely ground particles easily dissolve or unite with other ingredients, castor sugar is widely in use by bakers.

On the other hand, the particles of powdered sugar are finer than those of caster sugar. However, it is obtained from granulated sugar. It is quite popular with other names such as icing sugar, 10x sugar, and confectioner sugar.

The most common use of powdered sugar is as an additive that the bakers use. Usually, bakers add cornstarch to it to prevent clumps. Of all, the highest grind of it is 14x, which dissolves quickly. This pace of dissolution is the quickest of all forms of powdered sugars. Thus, 14x sugar is ideal for whipping cream.

See also: Butterscotch vs. Caramel

Uses for Distinguishing Caster Sugar vs. Powdered Sugar

Typically, castor sugar is used in making softest meringues, mousses, light cakes, pastries, and custards. The preferable use is for making meringues, as it dissolves efficiently into the split eggs.

Due to sharper edges than usual to pass through fat, batters quickly show up bubbles. It is also used in preparing a variety of beverages.

On the other hand, powdered sugar is often used in cake decorations, fillings, and in a few pastries like sable. There are some types of powdered or icing sugars that are non-substitutable.

For example, pure icing sugar has no additives, needs sifting, and is lumpy. This is why it is preferable for royal icing. Similarly, icing sugar mix contains corn flour and is not suitable for decorating cakes or pastries, as flour particles can result in mold in the presence of moisture. However, this sugar is ideal for fillings and icings.


Caster sugar is not as finer as powdered sugar. Further, powdered sugar is likely to have cornstarch, which is not there in caster sugar. Now, you can easily make out which of the two sugars are ideal for use in your dish!

See also: Dulce de Leche Vs. Caramel

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Monica Chortle

I am one of the home-makers, engaged in the cooking activities for a long hour. While my relatives get bored with any food, I try to find out the new recipes. Moreover, my friends also request me to arrange a party. I get busy in creating distinctive dishes. Read More