how many grams in a cup of powdered sugar?

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things people ask

• How much powdered sugar fills a cup for a buttercream batch?
  A standard American buttercream calls for 3-4 cups of sifted powdered sugar per cup of softened butter — roughly 340-450 g. Sift directly into the bowl before measuring; lumps that survive the sifter will appear as gritty specks once the buttercream is whipped, and no amount of mixing fully resolves them once the fat coats them.
• Can I swap powdered sugar 1:1 for granulated by the cup?
  Not safely. A cup of powdered sugar is around 113 g while a cup of granulated is roughly 198 g, so you'd be cutting sweetness almost in half. The cornstarch content also thickens liquids and can cloud syrups. If you must substitute, work by weight and pulse granulated in a blender to approximate the texture, accepting that cookies and frostings will behave differently.
• Why does my royal icing keep coming out lumpy?
  Powdered sugar absorbs ambient moisture and clumps inside the bag, especially in humid kitchens. For royal icing — where the surface needs to be glassy — sift twice through a fine mesh and weigh the sifted sugar at 113 g per cup. Skipping the sift means small clumps sit on the icing surface and refuse to dissolve in the cold egg-white base.

related conversions

• Powdered Sugar: tablespoons to grams
• Powdered Sugar: teaspoons to grams
• Powdered Sugar guide