How much less caster sugar to in reciepe?

Caster sugar is a superfine granulated sugar that is often used in baking for its light and fluffy texture. It is made by grinding granulated sugar into smaller crystals, which results in a sugar that dissolves quickly and evenly in liquids. Caster sugar is also known as superfine sugar or baker's sugar.

If a recipe calls for granulated sugar and you only have caster sugar on hand, you can substitute caster sugar for granulated sugar by reducing the amount of sugar you use. A good rule of thumb is to reduce the amount of caster sugar by 10% compared to the amount of granulated sugar called for in the recipe.

For example, if a recipe calls for 1 cup of granulated sugar, you would use 7/8 cup of caster sugar.