How many grams is 1 cup of icing sugar?
1 cup of icing sugar (powdered sugar) weighs
120g
That's 4.2oz. In a 250ml metric cup it's 127g.
This uses the US cup, the size American recipes mean. 1 cup is 237ml by volume.
Unsifted, straight from the packet. Sifted icing sugar is lighter: USDA gives 100g for a sifted cup.
Other amounts of icing sugar
Where these numbers come from
USDA FoodData Central, SR Legacy, food 19336: “Sugars, powdered”. USDA lists these household measures for it:
- 1 cup unsifted = 120g
- 1 cup sifted = 100g
- 1 tbsp unsifted = 8g
- 1 tsp = 2.5g
Fractions of a cup are the cup weight scaled down. Metric-cup figures assume a 250ml cup, and Australian tablespoons hold 20ml. Weights under 10g are rounded to 0.1g, everything else to the nearest gram. Full source list.