Gram to Cup

45 grams of powdered sugar to cups

45 g of powdered sugar is about 0.38 cups, which is roughly 3/8 cup or 6 tablespoons. That comes from 120 g per US cup. Unsifted. Sifted powdered sugar falls to roughly 100 g a cup.

Measure45 g of powdered sugar
Cups0.38
Kitchen measure3/8 cup
Tablespoons6
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 45 g of powdered sugar?
0.38 cups, or about 3/8 cup. 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 45 g of powdered sugar?
About 6 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 45 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 45 g of powdered sugar is 0.38 cups at 120 g per cup, while the same 45 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of powdered sugar

25 g28 g30 g32 g33 g35 g39 g40 g50 g60 g

See all powdered sugar conversions or 45 g of every other ingredient.