Gram to Cup

450 grams of powdered sugar to cups

450 g of powdered sugar is about 3.75 cups, which is roughly 3 cups + 3/4 or 60 tablespoons. That comes from 120 g per US cup. Unsifted. Sifted powdered sugar falls to roughly 100 g a cup.

Measure450 g of powdered sugar
Cups3.75
Kitchen measure3 cups + 3/4
Tablespoons60
Grams per cup used120 g

Powdered sugar, also sold as confectioners or icing sugar, is ground so fine that it aerates like flour. An unsifted spooned cup weighs about 120 g, while a sifted cup drops to roughly 100 g. That is a 17 percent difference from one word in the recipe.

Result
0.83 cups
About 7/8 cup of all-purpose flour. 100 g is 3.53 oz by weight.
Assumes spoon-and-level. Scooped flour runs closer to 140 g a cup.

Questions

How many cups is 450 g of powdered sugar?
3.75 cups, or about 3 cups + 3/4. That is worked out at 120 g per US cup, and a cup of powdered sugar can run 100 to 125 g depending on sifting.
How many tablespoons is 450 g of powdered sugar?
About 60 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 450 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 450 g of powdered sugar is 3.75 cups at 120 g per cup, while the same 450 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of powdered sugar

300 g320 g340 g350 g375 g400 g425 g454 g500 g600 g

See all powdered sugar conversions or 450 g of every other ingredient.