In a nutshell, caster sugar (sometimes spelled castor sugar

) is finely ground granulated sugar. It is not as fine as confectioners' sugar, as it does have a little grit to it, and is not powder-y. So, in terms of texture, it falls somewhere between granulated and confectioners'.

What can I use in place of caster sugar?

Caster Sugar Substitute

Granulated sugar will usually work just fine as a caster sugar alternative. Substitute on a 1:1 ratio (if your recipe calls for a cup of caster sugar, use a cup of granulated sugar).

Can I substitute granulated sugar for caster sugar?

Can I substitute granulated sugar for caster sugar? Your cakes will still hold up if you use granulated sugar as both the flavour and water content are the same. Caster sugar, however, is much finer and dissolves much easier than granulated sugar which is coarser in texture.